world's largest electronic trade...itrr ..rma ['wren/v111i +c r, or this 1111 ++....

WORLD'S LARGEST ELECTRONIC TRADE

,4

A)113>I0V1 7IV'r.Se:bk

T ^.

PARALcDG Pit44,Improves Color Reception

Three Ways

1. Plus GAIN- to pio sharper directivity toeliminate multipath reception.

2. Plus FLATNESS -to eliminate tilts whichcause incorrect colors on the TV screen. Industryexperts say that color antennas must be flat within±2 db. Paralog-Plus antennas are flat within ± Idb per channel.

3. Plus MATCH --to prevent color -distortingphase shifts.

The unique feature of the Paralog-Plus is aBI MODAL DIRECTOR system. Its parasitic ele-ments combine two hi -band directors into a singledirector covering all lo -band channels, plus theentire FM band. Thus, more of the elements workto bring in any given channel.

Plus -300 and 75 ohm outputs for match to eithertwinlead or coax. And full, flat gain over the entireFM band.

Plus these quality mechanical features: Self-clean-ing wedge -snap locks that tighten with vibration,Cycolac insulators to eliminate cumbersome crossfeed points, Golden Armor coating, Square boomconstruction, One-piece antenna array-and more.

Check on how these plus features can help makeplus profits for you. See your Jerrold distributor,or write:

DISTRIBUTOR SALES DIVISION

401 Walnut St., Phila., Pa. 19105JE IAD

. . . for more details circle 128 on postcard

Listen!Service dealers... stop playing the numbers gameIf you're in the service businessyou're selling time. And trackingdown loudspeaker numbers can be

,. a real waste of it.Get out of the speaker numbers

game and turn wasted time intoprofit by remembering this: Jensenhas every replacement speaker inthe book. You tell the Jensen dis-tributor the type of speaker you

need and he'll take one right offthe shelf. That's fast.

Another nice thing about Jensenspeakers is that they make the setsound better than new.

So when it comes to loudspeak-ers, the only number you need toremember is the telephone numberof your Jensen distributor. Youname it-radio, television, automo-

jensen

tive, intercom, electronic musicalinstrument or hi-fi--he's got a loud-speaker for everything.

Call him now. If you don't havethe name of your Jensen distributorwe'll send it to you.

Write to us: Jensen Manufactur-ing Division, The Muter Company,6601 South Laramie Avenue, Chi-cago, Illinois 60638.

NOVEMBER 1966

... for more details circle 127 on postcard

19

Get this $ 65RCA color TV course

whenyou buythis

D

COLOR TELEVISION

Htcri.vvu wet vivisioN HARRISON,"-

or this

WR-64B RCA Color WR-69A RCA TV -FMBar/Dot/Crosshatch Generator Sweep Generator

That's right! RCA Institutes famous Home Study Color TVServicing Course FREE, when you buy ANY ONE of the in-struments shown here. Buy all four... get four courses. Enrollall your technicians while you equip your shop with the instru-ments you'll need for color TV servicing anyway.Here's how it works: Simply buy one, or all, of the four instru-ments shown, the WR-64B, WR-69A, WR-99A, or WO-91B-ALL essential color TV test instruments-from your AuthorizedRCA Test Equipment Distributor between now and November15, 1966. Fill out your warranty registration card and attachthe white identification label on the carton. Send them to RCA,Test Equipment Headquarters, Bldg. 17-2, Harrison, NewJersey. We will send you the enrollment form and a binder

or this

WR-99A RCA Marker Generator

Itrr ..rma ['wren/V*111i

+c r,

or this *1111

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WO -91B RCA 5" Scope

containing the first two lessons. When you complete the lessonsand forward them to RCA Institutes for grading, the next les-sons will be supplied to you directly from RCA Institutes, allwithout charge to you.

But do it now. This offer is good only for equipment pur-chased between September 1, and November 15, 1968. Toallow for postal delay, we will honor cards received up untilDecember 1, 1966. Here's your chance to equip your shop forcolor servicing while we train your people for FREE!

Electronic Components and Devices, Harrison, N.J.

The Most Trusted Name in Electronics

20 ELECTRONIC TECHNICIAN

NOVEMBER 1966

VOL. 84 NO.

FO'J KIPP

JACK HOBBS

JOSEPH ZAUHAR

FH LLIP DAHLEN

DONALD GRANT

FICHARD CLAYTON

JUDITH BERINI

MAGGIE KANE

FU -H GELINEAU

5

Publisher

Managing Ecitor

Technical Editor

Associate Editor

Assistant Ecitor

Field Editor

Editorial Produc-ion

Advertising Produc-ion

Circulation Fulfillment

AN OJIBWAYPUBLICATION

OJIBWAY PRESS, Inc.Ciibway Building, Duluth, Minn. 55802

AREA CODE 218 727.8511

PU3LICATIONS DIVISION:

ROBERT EDGELLANGUS STONEBEN MARSHHARRY RAMALEY.IM GHERNA.OE WOWING

PresidentMarketing Manager

Editorial DirectorProduction Director

Art DirectorCirculation Director

WARREN BODIN Ad Production Supervisor

Safes Offices:

NEW YORK: Ron Kipp, 25 W. 45 St.New York, N.Y. 10036AREA CODE 212 581-4200

CHICAGO: Jack Daniels, 43 E. Ohio Si.Chicago, III. 63611AREA CODE 312 467-0670

A B P*NI rwo

sere

0ea i.r.s%

Copyright 1966 by Ojibway Press, Inc., Duluth,Mien. 55802. Reproduct.on and reprinting pro -la kited except by writtan authorization of thepJblication. Subscription price: $5 for 1 sear,$13 for 2 years $10 for 3 years. Pan Americanand Foreign, $9 for 1 year, $14 for 2 years,and $18 for 3 years.If you have a change of address or a quits-ti3a about your subs:ription, write: E.EC.IRONIC TECHNICIAN, Circulation Department,Ojmway Building, Dulath, Minnesota 55802.SE SURE TO SEND ALONG THE ADDRESS[ABEL FROM YOUR MOST RECENT ISSUE.Second class postage at Waseca, Minim.,sot, and at additional mailing offices.

DiTMASTER: Send notification Form 3579 toE.ECTRONIC TECHNICIAN, Ojibway Stoking, vth, Minnesota 55802.

ELECTRONICTECHNICIANWORLD'S LARGEST ELECTRONIC TRADE CIRCULATION

Cover

More technicians are servicing color TV sets today than aver before. Turn to page 56 and learnabout the new innovations coming up in 1967 sets.

FEATURES

Repairing Solid -State AM/FM Radios 41An expert radio technician tells how he frouileshoots and repairs these dual -bandhome and auto radios

Semiconductors from A to Z 48This continuing article series is a complete course in semiconductor technology

Service Bedrocks Sales 52The (Diciest service -dealer in Portland, Ore., tells how he's grossing a quarter -millionin 1966

Review of 1967 TV Sets 56Part two of a review that covers important innovations noted in 1967 color and 81WTV sets

Stereo Hi Fi Tone -Arms, Cartridges and Syli 60Part one of an article that covers some critical areas in Hi Fi stereo equipment

Another Opportunity For Alert Technicians 62A glimpse of things -to -come in medical electronic equipment

Communications and Control Equipment 64

DEPARTMENTSEditor's Memo 22 New Products 70

Letters to the Editor 24 Catalogs and Bulletins 92

Technical Digest 28 Naws of the Industry 98

Colorfax 66 A ivertiser's Index 104

TEKFAX - 16 PAGES OF THE LATEST SCHEMATICS

Group 171 November 1966

ADMIRAL: Color TV Chassis H12 IL IH12

AIRLINE: TV Model GHJ-3067A, GHJ-3367A

EMERSON: TV Chassis 120804, 805, 806,807, 823

GENERAL ELECTRIC: TV Chassis ETV

MDTOROLA: TV Chassis TS -461

SYLVANIA: Color Chassis D01, .1,2,8

NOVEMBER 1966 21

How "saving" 50C can ruina $700 color TV system!

The coupler is probably the least expensive item in a home TV system... yet the wrong coupler can send the investment in a top-quality distribu-tion system and TV set right down the drain.

At Blonder -Tongue, the same engineering skill and meticulous qualitycontrol goes into couplers that goes into our professional MATV products.The result: high isolation between sets, extremely low insertion loss andsharp pictures (they're backmatched).

Blonder -Tongue gives you variety, too ... the widest variety of color -approved, all -channel coupler models in the industry:A -102U/ V- deluxe 300 -ohm model connects 2 sets to one downlead.A-104/UV-similar to A-102U/V except for 4 sets.MDC-2VU -connects two coax (75 -ohm) cables from TV sets to a singlecoax downlead.

TV -2 -economy indoor model. Connects two sets to a single 300 -ohm twin -lead. Not recommended for weak signal areas.

Quality combiners and splitters are also essential to a good all -channelcolor TV system. When you specify Blonder -Tongue, you get high quality,low loss and high isolation.UVF-1- deluxe 300 -ohm weatherproof model. Provides separate UHF,VHF and FM outlets from downlead carrying all three signals or feeds asingle downlead from separate UHF, VHF and FM antennas.UVF-C/S -a lower priced version of the UVF-1.A-107 - deluxe, weatherproof unit combines UHF and VHF antennas toone 300 -ohm downlead or provides separate UHF and VHF output at set.UV-C/S -indoor unit provides separate UHF and VHF outputs from asingle 300 -ohm cable carrying both signals, for connection to converter orTV set with separate UHF and VHF inputs.Write for free catalog #74.Blonder -Tongue Laboratories, Inc., 9 Ailing Street, Newark, N.J.Blonder -Tongue, the name to remember, for T Vreception you'll never forget

itletTOR'S1 MEMO

Tighten Your Business Belt

Once again we're thumping on anold tom-tom we've been beating foralmost two decades: and the messageis the same. If you haven't heard itbefore or have forgotten the sounds,turn to page 52 of this issue and readabout it in detail. Thousands of old-timers in this business have heard thesounds echoing through the businessforest for years and they have listened,learned and prospered.

About this time every year some so-called trade magazines will start tell-ing you how "tough" competition willbe in the coming year. In a sense, thisis true. But what they fail to tell youis a lot more important. The businessman who really knows what he'sdoing and where he's going-knowshis business thoroughly-makes hisjob look easy. And so it is with thesuccessful service -dealers and techni-cians whom we have been telling youabout in every issue of ELECTRONICTECHNICIAN since March of this year.

Sure, competition is gettingtougher. But when was it not tough?People in general have always wantedas much service and quality as theycan get for a buck. They've alwayswanted to be "catered" to-to betreated fairly and squarely. These aresome of the simple fundamentalpsychological factors of ordinaryhuman relations which almost everychild in grammar school is aware of.

Yes, competition will be keener in1967-like we said it would be in1963 and 1964 and 1965 and 1966-and for many years before that. Sowhat?

The people you do business withwill spend more money in 1967 forproducts and services than they didin 1966. This assumes, of course, thatno major "cracks" develop in ourover-all national economy. And itassumes, too, that you run your busi-ness like our successful service -dealers are doing and have been doingfor years.

So, if you are not hep to what isgoing on in the Space Age world,especially in the area of home enter-tainment equipment, you'd bettertighten your business belt-give yourcustomers top service and recom-mend only quality equipment and ac-cessories-and you'll breeze rightthrough the "competition" bugaboo.



Ed Leahydoesn't work for

us.We workfor him.

Ed Leahy believes in being his own boss.Which is what Ed.likes about running his own PhilcoQualified Service Center. It means that, with no strings attachehe gets better training, better service and more benefitsthan any other manufacturer offers.

When he needs a part, he gets it fast. His PhilcoParts Distributor has what Ed needs right onhand. But even if Ed gets a job like fixing a1947 model, he knows the oddball parthe needs will be shipped in 24 hours or lessthrough Philco's Lifeline Emergency Service.

Ed keeps up on new products withPhilco Tech Data Service. He tried otherservices and found out that he gets thefacts sooner, better and at lower costfrom Philco.

Ed likes Philco's "fringe benefits," too.A complete accident insurance program forhimself and his men. Advice on businessmanagement, found in Philco's popular"Service Businessman" magazine. He getsextra business, too, when his name appearsunder a Philco listing in the Yellow Pages.

Ed Leahy has it good. You can, too.Talk to your Philco Parts Distributor orcontact Parts & Service Department, PhilcoCorporation, Tioga and "C" Streets,Philadelphia, Pa. 19134.

PHILCO

NOVEMBER 1966


23

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SEE THE ANTIQUE!Columbia Wire Products Com-pany's new shielded ultra -lowloss Permafoam transmission

cable has made standoff insulators a thing of thepast. Hookup to the antenna (with terminals al-ready fitted to the cable for your convenience),then run the cable to the set by the easiest route.Easily terminated at TV set. You can tape newshielded Permafoam cable to the antenna mast. . . run it down gutters . . . anywhere! Yet, thereis no pickup interference. It gets the job donefaster . . . to make you more of a good, old-fashioned profit.You can get full specifi-cations on new shieldedPermafoam from yourdistributor.

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Available in 50', 75' and 100' coils- 500' spools and 1000' reels.


LETTERSit TO THE EDITOR

Deluged With HelpThis is in reference to my recent

request for help in locating some oldtubes (3E6 and 1LA6). This requestappeared in the September "Letters tothe Editor." Did I receive help?

To date I have received 18 letters,two telephone calls and two cartonsof tubes plus two notices from thePost Office regarding postage due.

Shortly after my request for helpI did locate these tubes and repairedthe radio.

Thanks to everyone who so kindlywrote and offered help in locatingthese tubes. In the future I will surelyknow where to find help. Thank youvery much.

GEORGE ROBERTSMaywood, N.J.

We also received dozens of lettershere offering you help. - Ed.

Needs SchematicI have a Hawthorne Eldorado stereo

amplifier and preamp unit distributedby Electronics Transmission Corp.,103 E. Hawthorne Ave., ValleyStream, L.I., N.Y. A letter to themrequesting a schematic received noreply. They must be out of business.I wonder if anyone has taken overthe responsibility of supplying parts?I need a power transformer in addi-tion to the schematic.

Can any ET reader furnish infor-mation or help in contacting this com-pany or furnish information regardinga schematic or replacement transfor-mer?

DAN CRYSTALCrystal TV Service

Brighton, Mass. 02135

No CompetitorsI am well pleased, as in the past,

with ELECTRONIC TECHNICIAN andcan find no real competitors to it inexistence. It is the only magazinewhich serves the purpose forwhich it is intended - to aid thoseemployed in the professional repair ofTV, radio and two-way communica-tions equipment. The TV schematicsalone are more valuable than thesubscription cost. The articles are wellwritten in a manner easily understood.Words are not used (or wasted) ontechnical "jargon," petty quips andboring disputes between writers wish-

continued on page 90

24ELECTRONIC TECHNICIAN

risk your reputationwith "just -as -good" capacitors?When you pay little or no attention to quality in tubularreplacement capacitors, you leave yourself wide open forcriticism of your work ... you risk your reputation ...you stand to lose customers. It just doesn't pay to take achance on capacitors with unknown or debatable performancerecords when it's so easy to get guaranteed dependabletubulars from your Sprague distributor!

There's no "maybe"

with these 2 great

SPRAGUE DIFILM® TUBULARS IThe ultimate in tubular capacitor construction. Dualdielectric ... polyester film and special capacitor tissue ...combines the best features of both. Impregnated with HCX®,an exclusive Sprague synthetic hydrocarbon material whichfills every void in the paper, every pinhole in the plasticfilm before it solidifies, resulting in a rock -hard capacitorsection ... there's no oil to leak, no wax to drip. Designedfor 105°C (220°F) operation without voltage derating.

DIFILW BLACK BEAUTY®Molded Tubular Capacitors

The world's most humidity -resistant molded capac-itors. Tough, protective outer case of non-flamma-ble molded phenolic . . . cannot be damaged inhandling or installation. Black Beauty Capacitorswill withstand the hottest temperatures to befound in any TV or radio set, even in the mosthumid climates.

DIFILM ORANGE DROP)Dipped Tubular Capacitors

A "must" for applications where only radial -leadcapacitors will fit ... the perfect replacement fordipped capacitors now used in many leading TVsets. Double -dipped in rugged epoxy resin for posi-tive protection against extreme heat and humidity.No other dipped tubular capacitor can matchSprague Orange Drops!

For complete listings, get your copy of Catalog C-616 from yourSprague distributor, or write to Sprague Products Company,65 Marshall Street, North Adams, Massachusetts 01247

WORLD'S LARGEST MANUFACTURER OF CAPACITORS

SPRAGUE'THE MARK OF RELIABILITY

NOVEMBER 1966

. for more details circle 147 on postcard25

0perfec

411111 Back in 1962, we invented a new kind of TV antenna.

Licensed under one or more of U.S. patents 2.958,081; 2.985,879; 3.011.168; 3,108,280; 3.150,376; 3.210,767,RE. 25,740 and additional patents pending in U.S.A. and Canada. Produced by JFD Electronics Co. under ex-clusive license from the University of Illinois Foundation.


t. riO PERFECTIONI I CONQUEREDWe did not improve on an old antenna. Westarted from scratch to design a new one.Really new.

It wasn't easy. And it wasn't cheap. But itworked like mad.

We called it the LPV Log Periodic. Its per-formance caught our competitors with theircharts down. But it wasn't long before theycame up with LPV copies in every way-ex-cept in performance.

Meanwhile back at the JFD labs in Cham-paign, Illinois, our scientists and engineerscontinued their "assault on perfection." In1963, they again shattered antenna prece-dent by coming up with the first combina-tion VHF/UHF/FM log periodic antenna, theLPV-VU. Instead of three different antennas,installers now needed only one LPV-VU andone downlead.

Our competitors scoffed at the idea.They said it couldn't be done. Until the "eye -popping" results started to roll in. Then therewas a mad scramble for the LPV-VU band-wagon.

These "me -too" antennas looked like theLPV-VU Log Periodic. Sounded like it, too.But their charms were skin-deep.

Only the JFD LPV-VU delivered deluxe 82 -channel log periodic performance. Becauseonly the JFD LPV-VU followed the genuinepatented log periodic concept of the Univer-sity of Illinois Antenna Research Laborato-ries. Thanks to the protection of eleven dif-ferent LPV-VU U.S. patents issued and pend-ing-more than those of any other antenna.

You would think by now our Research andDevelopment people in Champaign wouldleave well enough alone. But no. These"Young Turks" have gone and done it again.This time it's a new all -band log periodicdesign-the LPV-CL Color Laser. (Must bethat "assault on perfection" bug they've stillgot up their polinear recorder.)Why did we call it the Color Laser?Well, engineers tell us that laser light beamswith their tremendous bandwidth capacityare the communications carrier of the future.And we believe that our new VHF/UHF/FMColor Laser with its extreme bandwidth,among other unique characteristics, is theantenna of the future-only it's available toyou now. How does the Color Laser deliverunsurpassed natural color, black and whiteacross 82 channels, and FM, too?Three reasons: (1) Patented *VHF "cap -electronic" Log Periodic V Design, (2) a new

Licensed under one or more of U.S. Patents 2.955.287 and 3.015.821 .1n.1 additional patent% pending

jFC1NOVEMBER 1966

broad band UHF "zoned" trapezoid driver,(3) a new disc -on -rod UHF director system.And there are patents issued and pending onall three.

We've also spun off the LPV "cap -electronic"Log Periodic section of the Color Laser. Itforms the heart of a great new VHF antennaseries we've named the LPV-TV.

This "assault on perfection" of ours involveda complete new mechanical design, as well.Results: "fast-lok" element brackets, "hot"twin booms. (no lossy harnesses or trans-formers), new super -strength double U -boltprofiles, high reliability cylindrical capaci-tors, plus our electrically conductive goldalodized aluminum.

If you're the breed of professional contractinstaller or self -servicing appliance dealerwho never settles for less than the best, wehave a suggestion. Use a JFD LPV-CL ColorLaser or LPV-TV Color Log Periodic on yournext installation. See what it feels like toinstall the best of all in performance andcustomer satisfaction.

YOJ will also see why our research and de-velopment people have now changed theirwa:chword from "assault on perfection" to"perfection conquered".

JF. V.TV LOG PERIODIC

JFD ELECTRONICS CO."Stri Avenue at 62nd Street. Brooklyn. N.Y. 11219JFD International, 64-14 Woodside Ave.. Woodside, N.Y. 11377 JFD Canada, Ltd., CanadaJFD de Venezuela. S.A.. Avenida Los Haticos 125-97, Maracaibo, Venezuela


27

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DIGEST

MAGNAVOXRadio Chassis R212-FM Stereo Translator Circuit

A new stereo translator circuit was introduced lastyear in the R211 radio and it has been incorporated in allnew radio chassis developed since that time. Three tran-sistors are used in translators which include a stereo indi-cator lamp circuit-otherwise, only two transistors areneeded. In most radio chassis the translator componentsare contained on a single printed circuit board; but insome chassis, such as the R212, the translator componentsshare the same board with most of the other receivercomponents.

The stereo signal at the output of the FM detectorcontains three parts-an audio signal, a 19kHz CW signaland stereo sidebands. The audio signal, or monophonicsignal, contains frequencies up to 15kHz. The 19kHz CWsignal, called the pilot signal, is present when a stereosignal is transmitted. The stereo sidebands contain stillhigher frequencies which are positioned above and belowa 38kHz center frequency. All three of these signal com-ponents combine to form the composite stereo signal.

TIIF. NIA, ;NA VOX FM STEREO TRANSLATOR

COMPOSITEAUDIOINPUT

COMPOSITE

AMPLIFIER0301

AUDIO/STEREO SIDE BANDS

19AC

ARC

DOUBLER/ AMP0302

DC

CONTROL

STEREO

DENOOOLAT OR

STEREO

INDICATOR AMP

0 303

CHAN I

CHAN 2

STEREO

LAMP

A block diagram of the stereo translator circuits isshown here. The composite signal from the FM detectoris amplified by Q301. Q301. is a broadband stage whichamplified all frequencies from the lowest audio frequencyto the highest stereo sideband frequency at 53kHz. At thecollector of the composite amplifier the 19kHz pilot signalis separated from the audio signal and the stereo side -bands. This is accomplished by a transformer tuned to19kHz which acts as a high impedance trap at 19kHz andalso couples the pilot signal through the secondary wind-ing to the 19kHz amplifier and doubler, Q302. The pilotsignal, when doubled in frequency, serves to reproducethe 38kHz carrier which was suppressed at the trans-mitter. This carrier must be regenerated in the receiverto demodulate the high frequency stereo sidebands. Dou-bling the pilot signal takes place at the output of Q302and results from a transformer tuned to 38kHz. The38kHz CW signal is then combined with the audio signaland stereo sidebands in the demodulator circuit to produceright and left channel audio output signals.

A separate monophonic audio output is provided incases where extremely weak stereo signals may produceexcessive noise. Better audio quality and improved signal-to-noise ratio may be obtained by operating the receiverin the monophonic position of the bandswitch.

A transistor, Q303, acts as a switch to turn on a stereoindicator lamp in those chassis which have this feature.



Cank_p t3

TUNER REPAIR

Sarkes Tarzian, Inc., largest manufacturer ofTV and FM tuners, offers unexcelled tuneroverhaul and factory -supervised repair service.Completely -equipped and conveniently-located Service Centers offer fast, dependableand factory -supervised repair service on allmakes and models. Centers are staffed by well -trained technicians, assisted by engineeringpersonnel.

Tarzian-made tuners received one day willbe repaired and shipped out the next. Moretime may be required on other makes. Everychannel-not just the channels existing in anygiven area-is checked and re -aligned per orig-

NT 1'1E

inal specifications. Exclusive cleaning methodmakes the tuner look-as well as operate-like new.

Cost, including ALL labor and parts (excepttubes) is only $9.50 and $15 for UV combina-tions. No additional charge. No hidden costs.Too, you get a full, 12 -month warranty againstdefective workmanship and parts failure dueto normal usage.

Always send TV make, chassis and Modelnumber with faulty tuner. Check with yourlocal distributor for Sarkes Tarzian replace-ment tuners, parts or repair service. Or, use theaddress nearest you for fast, factory -supervisedrepair service.

TUNER SERVICE CORPORATION(Factory -supervised tuner service authorizedby Sarkes Tarzian)

MIDWEST - 817 N. Pennsylvania St.Indianapolis, Ind., Box 1642Tel : 317-632-3493

EAST 547-49 Tonnele Ave., Jersey City, N. J.Tel : 201-792-3730

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WEST-SARKES TARZIAN, Inc.Tuner Service Division

10654 Magnolia Blvd.,N. Holiywood, Calif.Tel : 213-769-2720

NOVEMBER 196629

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TECHNICAL DIGEST

The switch is turned on when the 19kHz amplifier con-ducts. The 19kHz amplifier conducts when a pilot signalis applied to its base.

A schematic of the composite amplifier is shown here.

-I6V

2200

100K

71 KCTP301 TRAP

67KCC308 TRAP

COMPOSITE AMPQ30143P7

220

47K

18111F

AUDIOOUT

A lowpass filter is located in the base circuit of this stagewhich effectively removes extraneous noise that may bepresent in the detected signal above 71kHz. The amplifieris a conventional RC coupled stage and all three com-ponents of the composite signal appear amplified at thecollector. Here, at the collector, the pilot signal is separatedfrom the composite signal. The transformer, T301, istuned to 19kHz and couples the pilot signal through thesecondary winding to the frequency -doubler stage. At thesame time, the transformer acts as a 19kHz trap andprevents the pilot signal from appearing across the 2.2kcollector load resistor. The low frequency audio com-ponent and the high frequency stereo sidebands see theprimary winding as a low impedance and are coupledthrough C308 and a second trap circuit.

Some FM stations are authorized to transmit back-ground music service for hotels, offices, retail stores, etc.Such broadcasts are referred to as SCA (Subsidiary Com-munications Authorization). These special transmissionsuse a 67kHz subcarrier frequency to convey the musicinformation. It is possible for the SCA signal to mix withthe stereo sidebands and produce beats and whistles in the

AUDIOIN

R3I6330K


Operates like a manual. Aims like an automatic!

TheSemi -AutomaticColorotor!

If you're selling manual rotators, step up your sales withChannel Master's totally new concept in rotator controls thatgives your customers pinpoint precision at an economy price!For the first time in the design of ro-tator controls, Channel Master hasput a motor instead of a meter into anon -automatic control unit. The newSemi -Automatic uses a second mo-tor in the control unit which workstogether with the drive unit motor asa synchronized team. Up until nowonly automatic models have offeredthis quality feature, yet the semi-automatic is priced midway betweena manual and an automatic.

MUCH GREATER ACCURACY! Ex-clusive new Semi -Automatic controlunit provides almost 6 times moreindicator travel than the compasscontrol-more precise aiming-

NOVEMBER, 1966

more accurate relocation of sta-tions. Simple two -button control.Right button for clockwise rotation-left button for counterclockwiserotation. Antenna stops instantlywhen button is released.

BEAUTIFULLY STYLED. The controlconsole has been beautifully styledby a top industrial designer to asleek, contemporary look. Thesehandsome new units have tie graceand elegance to blend tastefullywith the styling of the contemporarytelevision sets in modern homes.

FAST, SIMPLE INSTALLATION.Uses economical, dependable 3 -

conductor rotator wire. No need tocalibrate or compensate for differ-ent cable lengths. "Cut 'n Strip"Guide molded into bottom. Barrierterminal board prevents shorts.Buil:-in wire strain -reliever insurespermanently tight connections.

#1.1111=imChannel Master has the most com-plete antenna rotator Step-up line inthe industry-choose from manual,Serri-Automatic, Automatic or De-luxe Automatic models.

CHANNEL MASTERELLENVILLE, N.Y.

...:or more details circle I 11 on postcard

31

Poll shows appliance dealers

prefer Channel Master colorantennas by tremendous margin.

We're not surprised. Read why.When it comes to color antennas, weknow our place. That it happens to befirst place-and that Channel Masterhas been up there a long time-is asweet thing to know. (Just try andbudge us.)

But-once in a while-isn't it nice tohave somebody else confirm whatyou've always known?

What happened was this: One of thenation's top three publications in theradio -TV -appliance merchandisingfield-(name on request)-made anindependent survey of color set appli-ance dealers. Result? The lopsidedbox -score, in case you haven't noticed,

High Man

On The

Totem Poll!

is down below. Please observe thatthe opposition isn't even close.

Now as long as Channel MasterCrossfires are up there we wanted toknow why they're up there. So werequested the same publication lotake a second poll. And just as wethought: Any specific brand of an-tenna may be preferred on manycounts. But one reason leads all therest. Performance! That's why theCrossfires are No. 1. They work better!(With color sets or black -and -white,naturally). This includes our VHF/ FMseries for suburbs -to -fringes, ourColoray ghost -killer series, and our

The best selling

antenna seriesin TV history

Ultradyne Crossfire 82 -channel FM orUltradyne UHF only series.

To what do we owe our success? Ourprinciples. (Unique engineering ones,of course. All of them patented or withpatents pending.) They make theCrossfires the mightiest antennas everdeveloped. With remarkably high gainand up to 30 -to -1 front -to -back ratios.(Maybe the competition's principlesjust aren't as powerful as ours.)

So call your nearest Channel Masterdistributor, join the rest of the gang,and come on up. The installation's fineand the profit's high.

OF THE 5 TOP -SELLINGANTENNA BRANDS DEALERSPREFER CHANNEL MASTER:

2 to 1 over Brand B

3 to 1 over Brand C

31/2 to 1 over Brand D

51/2 to 1 over Brand E

olor Crossfire


1:11) 1966 Channel Master Corp., EllenvIlle, N.Y.

1=111,1,111

CROSSFIRE COLORAY, Model 3618-G

The Winners!All COLOR -ENGINEERED by Channel Master

COLOR CROSSFIRE SERIES Seven modelsfor VHF/FM/FM Stereo from near suburban todeepest fringe areas.

ULTRADYNE CROSSFIRE SERIES Revolution-ary 82 -channel plus FM and FM Stereo anten-nas. Six models for suburban to near fringereception.

ULTRADYNE SERIES Unique no -coupler -re-quired design in three UHF only models formetropolitan to near fringe areas.

COLORAY SERIES Amazing electronic ghost-killers in two VHF/FM/FM Stereo models andone 82 -channel plus FM/FM Stereo model.

CHANNEL MASTER Ellenville,New York

... for more details circel 113 on postcardNOVEMBER 1966 33

TECHNICAL DIGEST

demodulated audio output. For this reason, a 67kHz trapis used to attenuate the SCA signal so that interference isavoided.

The stereo demodulator circuits are shown here. The19kHz pilot signal is amplified by Q302 and the frequencyis doubled by T302 which is resonant at 38kHz. The38kHz signal is always separated 180deg across the endsof the secondary winding. The audio signal and the high -frequency stereo sidebands from the composite amplifierare connected to the center -tap of the secondary winding.The combined signal is then applied to the four demodu-lator diodes. The wavefo7m at TP303 is a 38kHz envelopewith left channel audio variations along the positive peaksand right channel audio variations along the negativepeaks. At the opposite end of the secondary winding thewaveform is inverted and the right and left channel audiovariations reverse their positions on the envelope.

38KC WAVEFORM AT TP303

Left Channel Signal

D301Conducts

D303Conducts

Right Channel Signal

38KC WAVEFORM AT OPPOSITE ENDOF T302 SECONDARY WINDING

Right Channel Signal

D304Conducts

Left Channel Signal

D302Conducts

Audio variations in the postive peaks of the 38kHz en-velope at TP303 forward bias D301 in the left channeldemodulator. At the same instant the audio variations inthe negative peaks of the bottom envelope forward biasD302 which is also on the left channel. The 38kHz sub-

Experiencefor Sa/e.....450

Sure seems we started something!Yes; over ten years ago, when we startedoverhauling tuners (all makes and models),we set a price of $9.95 for this service.Apparently there are those who would liketo imitate our achievement-and for 45cless.

Maybe the special skills, special equipmentand downright old fashioned experiencewe built up during these past years areworth that little extra.-You be the judge.Remember; 450 buys you more than aquarter of a million man/ hours of expe-rience, plus true devotion to our business. . . our only business . . . overhaulingyour television tuners the best way weknow how. And in over ten years wesure know how!

Castle - The Pioneer of TV tuner overhaulingNot the cheapest - just the best.

4

For complete tun-er overhaul we stillcharge only $9.95.This includes alllabor and parts;except tubes andtransistors, whichare charged extraat low net prices.

Simply send us the defective tuner complete; include tubes,shield cover and any damaged parts with model numberand complaint. Your tuner will be expertly overhauled andreturned promptly, performance restored, aligned to originalstandards and warranted for 90 days.UV combination tuner must be single chassis type; dismantletandem UHF and VHF tuners and send in the defective unitonly.Exact Replacements are available for tuners unfit for over-haul. As low as $12.95 exchange. (Replacements are new orrebuilt.)

CASTLETV TUNMAIN PLANT:

EAST:

CANADA:

ER SERVICE, INC.5713 N. Western Ave., Chicago 45, Illinois41-92 Vernon Blvd., Long Island City 1, N. Y.Castle TV Services, Ltd.... Nation-wide service.For service in Canada write to Chicago or usereader service card in this magazine.Major parts are charged extra in Canada.

TECHNICAL DIGEST

carrier is filtered out by the capacitor connected betweenthe diodes and the detected audio signal passes through ade -emphasis network to the audio preamp.

In like manner, the right channel audio variations onthe 38kHz envelope are detected by D303 and D304.D303 conducts on negative variations of the envelope atthe top of the secondary winding and D304 conducts onpositive variations of the envelope at the bottom of thewinding. The 38kHz filter and de -emphasis network atthe output of the diodes is the same for both channels.

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The stereo indicator lamp circuit is also shown here.The operation of the lamp is dependent upon the con-duction of the 19kHz amplifier. During no -signal condi-tions or when a monophonic program is received, Q302is forward biased by a very small amount so that col-lector current barely flows. The low forward bias voltageis obtained by using a large value resistance, 330K, in thebase circuit to ground. To stabilize the base -emitter voltagefor variations in power supply voltages and temperaturechanges, diode D306 is effectively connected across thebase -emitter junction.

When a stereo signal is received the 19kHz pulseson the base of Q302 cause full collector current to flow.After passing through the primary winding of the 38kHztransformer, the pulses are filtered by C312 and a negativedc voltage is developed across the indicator sensitivity con-trol. A portion of this voltage is applied to the base ofQ303 and causes it to conduct. Q303 acts as a switch whicheffectively grounds one side of the indicator lamp. Powerfor the lamp is obtained from the 6vac winding on thepower transformer. The ac voltage is rectified by D305which drives the lamp with negative -going pulses. A 2712resistor is connected in series with the lamp to limit cur-rent flow.

Under no -signal conditions, or when a monophonicprogram is received, Q302 is biased to near cutoff. Sincevery little collector current flows, there is practically novoltage drop across the indicator sensitivity control and



/AAA. E r, - ;IFROM ArriZeblie

MODEL GC-660-COLOR BAR GENERATOR

A

GENERATOR

THAT

"STAYS PUT"

Price$159.50

A proven, field-tested design "Stays put"-designed for Alaskan cold and Floridaheat and humidity* 0.1 ,usec dots-plus a crosshatch pattern that doesn't "flicker" Standard gated color bars at zero reference level-for correct color phasing adjustments.Let's face it, the biggest problem you've had in using anybody's color generator hasbeen having it work right every time you turn it on-you can't get much use out of agenerator that wastes your time while you wait for it to settle down, lock in, and stayput. *Hickok's new Model GC -660 has actually been tested for its ability to "stay put"not only in field tests but in a Military Standard Environmental Chamber. It's notperfect but we think it beats anybody else's. Why not ask your Hickok distributor for ademonstration and prove it to yourself?

THE HICKOK ELECTRICAL INSTRUMENT CO. 10523 Dupont Avenue Cleveland, Ohio 44108... for more details circle 126 on postcard

... for more details circle 123 on postcardNOVEM FR 1966

A FamilyFun -for -allfrom theFamily ofG -E TubesIf you're all for fun, then get set for a real treat!

Exciting G -E gifts (the premiums the whole

family wants) can be yours with purchases from

G. E.'s family of receiving tubes. Earn

long-lasting G -E home and business products

for your family and yourself... and at the same

time stock up on G -E entertainment receiving

tubes ... the line you can count on for

top quality. See your G -E Distributor* today and

get the full picture on how you can earn

your share of G -E premiums. Distributor Sales,

Owensboro, Kentucky. He t3

'Premiums available at the option ofyour G -E Tube Distributor

Moen,. 7'herek Shirr 10°°°°°°* ELECTRONICin Storeflor Ion... COMPONENTS DISTRIBUTOR

A. Slicing Knife A real sharp performer! Perfect for slicing everything from tomatoesto roasts. Handy wall rack permits blades and unit to be stored ready for imme-diate use. Has 9" stainless steel slicing blades and detachable cord. OrderETR-4484.

B. Trip Mate Travel Clock (Electric) A great traveling companion! When the sun goesdown, the dial lights up for easy reading at any hour. Compact, with rich vinylcase. Cord is stored in handy compartment. Order ETR-4483.

C. Miniature Transistor Radio Trim, compact and a great performer! Includes 6 transistors and features a 2" magnetic -type speaker in an acoustically designed case.Comes complete with matching carrying case, battery and earphone. Order ETR-4474.

D. Flashbulb Kit (Pack of 12) A flashbulb to fit every camera! The AG1B bulb is usedwith most modern low -end cameras. The M2B is used with older models of standand cameras. The M3 is for Polaroid Cameras and for taking color photographsindoors.AG1B Order ETR-4478 M2B Order ETR-4479 M3 Order ETR-4480

E. Electric Can Opener A great timesaver! Opens any shape can: large, small. roundor square. Magnet lifts the lid and prevents it from dropping into food. Easy toclean. Includes a storage area for cord. Order ETR-4485.

F. Walkie Talkie (Set of 2) Calling all families! Includes 4 transistors and will carrya voice as far as 3.8 of a mile. Features a telescopic whip antenna, push buttontalking switch and on -off volume control button. Order ETR-4475.

G. Rechargeable Flashlight lets you see the brighter side! Provides a constantstrong beam of light for two hours when fully charged. Handsomely styled chargerbase keeps batteries fully charged. Order ETR-4481.

N. Portable Transistor Radio The sweet sounds of music and news! Has 8 transis-tors and features a powerful 3" Dynamic speaker. Operates on 4 "AA" penlitebatteries for 150 hours of listening pleasure. Includes a separate earphone andattractive carrying case. Order ETR-4477.

A.

E. 41-111

s°

NINON C 0

GENERAL ELECTRIC

I. Cordless Electric Toothbrush Get radiant smiles from the family! Brush has asafe controlled up and down motion. Power handle has a convenient push buttonswitch for onoff action. Complete with attractive charger base and brushes.Order ETR-4486.

J. Rechargeable Cigarette Lighter The perfect match! Elegantly styled, windprooflighter. Will light up to three packs of cigarettes, without recharging. Features adouble coil lighting element for fast even lights. Complete with charger unit.Order ETR-4482.

K. Show 'N Tell A masterpiece in showmanship! Projects colorful film slide storieson the simulated television screen in time to words and music. Unit can beused separately as a 4 -speed record player. Plays all 16, 331,a, 45 and 78 rpmrecords. Order ETR-4476.

VW flash

TECHNICAL DIGEST

before you buy anycolor generator..get all the facts

only one has allthese features andit's only 9950

LECTROTECH V6Any comparison will prove that the Lectrotech V6 truly standsalone. Provides all of the time -tested standard features plusmany Lectrotech exclusives for the fastest, most reliable colorinstallation and servicing. The V6 gives you: Crystal -controlledkeyed rainbow color display All cross hatch, dots, verticallines only, horizontal lines only Red -blue-green gun killer(usually extra or not available on other color bar generators) Exclusive Dial -A -Line feature (Horizontal adjustable 1 to 4

lines wide) Exclusive solid state reliability Exclusive volt-age -regulated transistor and timer circuits Exclusive simplifedrapid calibration Off -On Standby Switch Adjustable dotsize Color level control Connects to antenna terminals(no connections needed inside of set) Power transformer -lineisolated, to prevent shock hazard Lightweight and portable,only 41/2" H. x 75/8" W. x 10%" D. Weight, 71/2 lbs.Except our oewn V7

V7Sensational new Lectrotech V7 - theonly complete Color TV Test Instrument.

Has all the features and performance of theV6 PLUS Lectrotech's exclusive built-in ColorVectorscope for simplified visual color servicing.

Complete only 18950

MADE IN USA.

ONE YEAR WARRANTYSee your distributor or write for detailsbefore you buy any color generator.

LECTROTECH, INC.Dept. ET -11,1221 Devon Avenue Chicago, Illinois 60626


Q303 is zero biased. Under these conditions Q303 actsas an open switch so the indicator does not light.

The stereo indicator sensitivity control should beadjusted while receiving a stereo program. A VTVMis connected to the collector of the indicator amplifier(Q303) and the sensitivity control is adjusted for a readingof -1v. Operation of the lamp should then be checkedon all stereo stations normally received in the area. Ifthe lamp fails to light on a particular station, and thatstation is known to be transmitting a stereo program aridis received with almost full quieting, alter the setting ofthe control slightly until the indicator just lights. Sensitivityis increased by turning the control in the CCW direction.

During monophonic reception the audio signal passesthrough the demodulator diodes and is amplified equallyin each channel. To prevent the diodes from partiallyrectifying the audio signal and producing distortion, a dcvoltage is applied to the diodes. R316 couples a smallamount of negative voltage through the center tap of the38kHz transformer to all four diodes. Diodes D302 andD303 become forward biased so that a direct signal pathinto each channel is established and distortion is avoided.

The stereo translator used in the new R216 and R217radio tuners contains the same circuits as those describedhere. A variation does exist to the extent that the AMaudio signal also passes through the composite amplifierThis point should be remembered when servicing the AMcircuits of these tuners.

MOTOROLAColor TV Chassis TS-914-Low Brightness

Check the value of R224 connected from arm toground of master GI control. If the value of this resistoris 47K, change it to 150K and readjust background andmaster G1 control.

Low brightness can also be caused by low emission ofthe 1st video amplifier tube V6 (6DX8) or the 2nd videoamplifier tube V7 (6LY8). Conduction of these tubesaffects the plate voltage of the video output tube and thusthe voltage of the cathodes of the CRT.

Check the value of the contrast control. It should be200n. A higher resistance will also reduce brightriess.

IF YOU

CHANGE YOUR ADDRESS

NOTIFY: ELECTRONIC TECHNICIAN

Ojibway Building

Duluth, Minnesota 55802

Please include the address label from a recentissue and allow six weeks f.,r the change.


NIF

How long was yourdistributor out ofstock after thesenew cartridgeswere introduced?It isn't easy to keep up with the many rew phono cartridges being introduced these days.

And if your distributor doesn't order until you ask for them - you're in trouble.

After all, a delay of more than 24 hours can cost you plenty in customer goodwill -perhaps even a sale.

But that problem is eliminated when ycu deal with an Electro-Voice distributor.

Here's how. He can place a standing order with us. We ship every new model to himautomatically, as soon as it comes out. He doesn't wait for an order, and neither do we.

This way, the new models are waiting for you beforeyou need them. It's good business tosee your E -V distributor- he's first witheverything in needles and cartridges.

NOVEMBER, 1966

011ecZ tricz°The modern complete line of replacement phono cartridges

ELECTRO-VOICE. INC., Dept. 11677; 663 Cecil St., Buchanan, Michigan 49107


39

It pays to be particularin outer space.That's why RCAbuilds weather satellites forNASA using solid integratedcircuits -the most reliable kindof circuitry ever made.And it pays to be particularabout performance. That's whyRCA Victor was the first to adaptthis kind of circuitry for use inthe sound system of some ofits newest color and black -and -

white TV sets themost reliableTVonthe market. The Most Trusted Name

in Electronics


REPAIRING

SOLID-STATE

AM/FM

RADIOS

Learn how to speedtroubleshooting procedures

and make more moneyservicing this equipment

ELECTRONICTECHNICIAN

NOVEMBER 1966

Service technician checks an RCA solid-state amplifier.

Most AM/FM radios made today contain solid-state circuitry havinga variety of transistors and diodes, the radios are made in several sizes.The smallest units are pocket -type receivers and they increase in size totable models, auto radios and AM/FM console home types.

All solid-state AM/FM receivers even!ually require the attention ofgood technicians. But many shops are neither technically prepared norproperly instrumented to efficiently service this equipment.

Large and Small AM/FM RadiosSmall AM/FM pocket radios are not much different than console

models, except they have fewer transistors and other components - gen-erally from eight to ten transistors. As we already know, the AM bandtunes from 550 to 1600kIlz and the FM band tunes from 88 to 108MHz.

Pocket radios usually have three IF stages preceded by an FM RFamplifier and FM converter circuit. The first FM IF transistor amplifieralso serves as the AM converter. The following two FM IF stages alsoserve as the AM IF amplifiers. Crystal diodes are used in both AM andFM detector stages.

The audio section may have a separate 1st audio stage feeding thetransistor driver stage. Two transistors are generally used pushpull in theaudio output circuit. These small pocket radios are battery operated.

Most circuits in small AM/FM portables and table model radios areidentical. In some larger models a separate FM converter stage and FMAFC circuit may be added. The larger AM/FM radios are ac operatedand have a silicon diode and transistorized power supply.

Although solid-state AM/FM portable radios are very small andcompact, don't be afraid to tackle them when repairs are needed. Theyare only smaller versions of AM/FM table 3r console varieties and defec-tive components are isolated in the same way.

NOVEMBER 1966 41

SOLID-STATE

AM/FM

RADIOS

Fig. 2-Block diagram of a typical AM/FMradio.

Auto and Console Types

Auto and console type AM/FMsolid-state radios are somewhatmore complicated in circuit designand have several added stages. Youmay also find a separate AM con-verter and FM oscillator stage inthese models. The AM converterstage may combine the mixer andoscillator or have a separate solid-state mixer circuit. A separate mixerstage is employed on the FM band.

Some console models may havean AM RF amplifier ahead of theconverter stage. Most large consolemodels have a separate FM IF am-plifier stage ahead of the first AM IFamplifier and 2nd FM IF amplifierstages. And most console modelshave four FM IF amplifer stages.

Console AM/FM radios includeFM/stereo with a stereo phonoamplifier section. The FM multiplexcircuit has a multiplex amplifier, a38kHz amplifier, stereo indicatoror two 19kHz amplifier stages pre-ceding the 38 kHz amplifier.

Two dual high gain solid-stateamplifier channels are switched intothe FM multiplex or phono circuit.Generally, the two audio channelshave two AM amplifiers ahead ofa driver stage. Two or more powertransistors are used in the final push-pull output stages.

Solid-state AM/FM auto radiocircuits have a high gain outputand compacted components. MostFM front-end tuning units are wellshielded and are difficult to repairwithout unsoldering a lot of circuitconnections. The FM RF amplifier,

SPK.

_t.. -jFM FM IST FM IF 2NDFM IF 3floFM IFFM

RATIO

RF CONY AM CON V IsT AM IF 2NDAM IF DET

PUSH PULLOUTPUT

POWER

OUT

POWER 1.0_1OUT

2ND

AF

FM oscillator and FM mixer tran-sistor are frequently sandwiched be-tween the circuit board and thetuning unit.

Test Instruments You'll NeedA VTVM is a valuable test in-

strument you'll need for makinglow voltage measurements in tran-sistor circuits. Also, a good VOM,having low voltage and currentscales, is required. An AM/FMsignal generator or a small noisegenerator will also prove helpfulin locating defective RF, IF oraudio stages. The AM/FM generatoris also used in frequency alignment.A straight AM signal generator canbe used to align the FM stagesbut a sweep generator and scopeare more accurate for discriminatoralignment.

A regular output meter or VTVMcan be used to measure gain infrequency alignment. A scope andaudio squarewave generator is use-ful when checking for loss of signalor distortion in the stereo audiocircuits.

You can use your old AM signalgenerator to trace and isolate faultsin the RF, IF and converter stagesof solid-state AM/FM radios.

Test instruments required foreffective AM/FM radio servicingare found in a large number of shopstoday but a few relatively new in-struments are still missing frommany shops. These include quick -action "analyst" type radio trouble-shooting instruments, in -circuit acbeta transistor testers and stereomultiplex generators. The latter is

AMDIODE

DET

1ST

AF

a much -needed instrument for FM/stereo multiplex servicing. Last, butnot least, are manufacturers exact -type schematics which are a greathelp in locating defective compon-ents.

Rapid Troubleshooting

As most expert bench techniciansalready know, the first step introubleshooting is to isolate thesection where the defective com-ponent is located. In other words,isolate the fault to one of the specificfunctional sections of the receiver.If the radio performs on the AMband, for example, but is dead onthe FM band, then you know im-mediately that you have to go di-rectly to the FM oscillator and FMRF amplifier stages. In most AM/FM receivers, if the trouble is in theAM section, it must be ahead ofthe 3rd transistor (see schematicin Fig. 1). Remember, the 3rd tran-sistor is the AM converter and 1stIF amplifier stage. Generally, ifthis stage is defective, the FM sectionwill also be inoperative. It is pos-sible, in some cases, for the AMconverter transistor to be weakenough not to oscillate on the AMband but a strong local FM stationcan still be heard.

If you have a dead receiver, beginat the volume control. Inject a signalfrom a noise generator into the cen-ter terminal of the volume control.If the audio stages are working,a loud tone will be heard from thespeaker.

If the audio stages appear to beworking, inject a signal into the


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base of the 3rd IF amplifier stage.Proceed toward the front-end ofthe AM/FM circuit. If you do nothave a noise -type injection signalgenerator, use an AM/FM signalgenerator to check the RF and IFsections. Leave the volume controlturned full on and keep the signalgenerator's gain control as low aspossible (see Fig. 2).

When you locate a point of lowsignal or no signal, as indicated bythe radio's speaker, the trouble isnear at hand. If, for instance, thesignal is low at a transistor's col-lector terminal and high on the baseterminal, you have probably locateda defective transistor. Take voltageand resistance measurements at thispoint.

A quick way to prove if the tran-sistor is leaking or not amplifyingproperly (before removing it fromthe circuit), is to shunt a silicondiode across the base -to -collectorterminals. If the gain is about thesame, reverse the diode connec-tions and notice if the volume in-creases. If it does, the transistoris defective. This simple check willwork on defective RF, IF or audiotransistors when they are still in -circuit. There is no danger of dam-aging the transistor being checkedif the silicon diode is placed in thecircuit momentarily.

If the transistor is defective, un-solder it and install a new oneafter making certain that supplyvoltages, capacitors and resistorsare normal.

A B

Fig. 3, 4 and 5. (A)-Scope trace shows a perfect output from a solidstate amplifier using a1kHz squarewave at the input. (B)-A 1kHz squarewave applied to the phono input shows lowfrequency boost at the amplifier output. (C)-A 1kHz signal injected at the volume control ofan RCA model VGP83 amplifier shows a loss of gain and distortion at the amplifier's output.The trouble was caused by a shorted 10Opf 6v coupling capacitor.

To check the AM IF stages, in-ject a 455kHz AM generator signalinto the base of the AM convertertransistor and go through each IFstage toward the AM detector stage.In checking the FM IF stages, setthe AM signal generator to 10.7 -MHz and proceed in the same man-ner.

The RF stages of the AM sectioncan be checked by loosely couplinga signal loop to the AM antennacoil with the signal generator setat 1600kHz. Feed a 90MHz mod-ulated signal into the antenna ter-minal connections to check the FMRF stage.

Manufacturers' instructions shouldbe followed in all solid-state AM/FM receiver alignments. This appliesespecially to alignment of stereomultiplex sections.

Quick Audio Circuit CheckA quick check of the audio sec-

tion can be made as follows: Firstdetermine if the complaint is weakaudio, distortion or no volume. Lowvolume and distortion can usuallybe traced to the audio output stages.Begin at the volume control andinject a signal from the noise gen-erator into the base of each audiotransistor. A good audio signal gen-erator can also be used to injecta signal at this point. If the tran-sistor amplifier's volume is veryweak, notice if the signal decreasesas you proceed through the audiocircuit.

For example, if the collector ter-

minal of the driver transistor indi-cates the presence of a signal andwe apply the audio signal generatorprobe to the base of the same tran-sistor and the signal is very weak,we have found a defective audiostage. Most causes of audio dis-tortion can be located in the audioamplifier stages. Distortion can becaused by leaky output transistors,leaky coupling capacitors andchanged -value bias resistors. A verygood instrument for locating audioamplifier distortion is a squarewavegenerator and a scope. Variousscope patterns are shown in Fig.3, 4 and 5. Use a 47 to 60) re-sistor across the speaker terminalson the output transformer. Removethe speaker from the circuit.

A squarewave generator may alsobe used to locate weak or low -gainaudio stages. Each stage can bechecked for gain and distortion withthe output meter or scope. If theaudio stage happens to be a stereoamplifier section, each stage can becompared with the good audio chan-nel.

For instance, if one stereo chan-nel is weak and will not balance,check the signal out and compareeach stage with the good channeluntil the stage is located where thevolume is lost. The balance controlmay be off only to one side butby using an audio signal generatorand checking from the phono car-tridge output through the amplifier,the small signal loss can be easilylocated. Compare and check each


individual stage with the good stereochannel.

As the FM receiver section be-comes older, the stereo balance con-trol will become more difficult tobalance. You may also notice onstereo multiplex that the balancecontrol will not be perfectly bal-anced when the receiver is new.

Actual AM/FM Trouble CasesA weak FM station within the

FM band can easily be caused bya weak RF amplifier transistor.Other stations can come in good.When this condition exists, you willnotice that the FM "hissing" noiseis usually low on the FM band.

This trouble actually happenedin a 1966 Dodge model 364 AM/FM auto radio which came to theshop. The local FM station wasoperating as it should, but a stationthirty miles away could not beheard. When the auto was new,this station was received regularly.

Isolating the trouble with thehelp of a schematic, the troublewas indicated in either the FMmixer, oscillator or the RF ampli-fier stages. These three transistorsare sandwiched between the FMetched board and the tuning as-sembly. To pull the FM board outis a lot of work so the FM transistorswere removed and checked. Sincethe local FM station came in good,we decided to begin with the RF FMtransistor. Removing these tran-sistors from the etched board re-quires extreme care and patience.

AM FM Solid -State Radio Trouble Chart

Symptoms AM FM

Weak Stations-poorselectivity

i Check AM RF amplifier, oscilla.tor, 1st and 2nd IF stages.

Check FM RF amplifier. Checkalignment of FM IF stages.

Noisy Reception Check both IF stages capacitorsin IF transformer will short ou:- see if same voltage on bothwindings.

Check transistors in front end oftuning unit. Check capacitors inemitter legs of each IF tran-sistor.

Stations Fade Out Check RF and convertor transis-tor. May be weak and oscillateonly on one portion of the dial.After awhile will fade cut.

Check RF, Oscillator, and mixertransistors.

Loud Tuneable Hum orBuzz

Check IN34 or AM detector Check ratio detector diodes.Check filter across both diodes.

No FM Multiplex indicator light

Check bulb. Check transistor inmultiplex circuit. Check indicatortransistor. Check multiplex align-ment.

Poor AM reception

Good FM reception

Check AM antenna and RF, con-vertor transistors if the receiverhas separate stages.

Poor FM reception

Good AM reception

Check FM RF Amp. FM oscillator,FM mixer transistors. Take volt -age measurements.

Weak Audio on phonooutput

Check and see if right or left channel. Compare the signal witheach stage as progress through circuit - use an audio signalgenerator and scope for gain or loss of signal.

Intermittent audio Check if on phono, see what channel and first check the crystalcartridge. See which cannel is intermittent. Use scope to traceintermittent signal of each stage - isolate defective stage.Check large electrolytic capacitors in transistor output stages.Check coupling electrolytic capacitors.

Audio Distortion Check driver and output transistors. Check for burned transistors,or changed bias resistors. Take critical voltage checks. Check forleaky coupling capacitors. Use a scope with I kHz tone from audiosignal generator and go from stage to stage.

NOVEMBER 1966 45

SOLID-STATE

AM/FMRADIOS

Pencil points to a cracked printed circuitboard on a G -E portable. Note the crack isaround a heavy component-a pm speaker.

We quickly discovered a very weakRF transistor and replaced it.

Always make sure that FMtrouble is first investigated beyondthis FM unit. These FM tuningunits are generally well shielded andwedged tightly together. When re-moving or bending any componentsor wires in these circuits, be sureto replace them in their originalposition.

Intermittent FM reception is usu-ally caused by loose coils, capac-itors and a cracked printed board.

Coil L2, for example, in a pocket -sized RCA model R6M19, is sol-dered into the printed circuit board.

Typical alignment setup for FM.

A local FM station faded in and out.One of the ends of the small coilbecame loose and intermittent re-ception resulted. Intermittent AM/FM reception can also be causedby a weak RF, oscillator or IFtransistor. A weak oscillating tran-sistor in any one of these stageswill cause an intermittent squeal

Another RCA model R6M39,AM/FM radio had only FM hissingnoise on the entire FM band. Thiswas caused by a leaky IN34 diode(see Fig. 6).

Another AM/FM receiver withthe same model number had only

10.7 MHzRATIO DETECTOR

TO AUDIO

weak local AM reception. Abroken yellow lead to the ferriteAM antenna caused this trouble.Only the two local stations couldbe heard, along with a lot of hum.

The next trouble was in a VMmodel 962-1 radio chassis with weaklocal AM stations and no FM re-ception. The trouble was first tracedto the 2nd FM IF amplifier andfirst AM IF transistor, X7. Thistransistor was removed from thecircuit but it checked good. Thetrouble was caused by C50, a 0.05capacitor in the emitter circuit ofthe transistor (see Fig. 7).

A leaky 2nd AM/FM IF tran-


The pencil points to a broken antenna coil in an RCA model RGM39receiver.

sistor in a Magnavox R205-01-00chassis caused low volume and alot of distortion.

A loud hum and rushing noiseon the FM band of an Admiral12A2 chassis was caused by ashorted diode, CR4, in the FMratio detector circuit. Only a localFM station was heard and it wascovered by heavy hum and dis-tortion.

Another Admiral model Y8519solid-state console came into theshop with a dead right stereo chan-nel. The customer said a loud popand cracking noise was heard beforethe right channel went completely

The pencil points out a loose FM coil in an RCA RGM19 receiver whichcaused intermittent FM receptic n.

dead. A 1 kHz audio generatorsignal was injected into the baseof each transistor and the troublewas quickly traced to a defectiveAF emitter -driver stage. No signalcame from transistor 57C6-1. Sim-ply by shunting a silicon diodeacross the base and collector ter-minals, the 1 kHz audio tone washeard through the right channelspeaker.

Intermittent audio may be causedby defective electrolytic couplingcapacitors, transistors and a crackedboard.

A G -E model p1905B came inwith the board cracked around the

IFINPUT

RATIO DET / CR4 \1 IN34 1 R30

TO T6PIN 6

R34

TO AUDIO AMR

Fig. 6-A leaky 1N34 in the detector section of an RCA ROM39caused hissing noise on the FM band.

output transformer and speaker.Most breaks on etched boards takeplace around heavy mounted com-ponents.

Hum and motorboating are usu-ally caused by filter capacitors inthe ac power supply or battery in-put circuits. An RCA model RGM19AM/FM receiver was motorboat-ing. The trouble was caused by a50pf filter capacitor, C50, followingR43 :n the battery circuit.

High impedance hum may becaused by ungrounded circuits inthe phono or transistor base inputsof audio amplifier stages, also apoor ground on shielded leads.

10.7 MHz

31ST AM IF

2,4oFM IFR301- - - -

YIEN 230

9.2V I--

C500-*

.05%I 8

R29390

&It

TO A3 455 kHzIF COIL

9V

Fig. 7-A shorted capacitor In this circuit caused very weakAM reception and killed FM altogether.

NOVEMBER 1966 47

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10

SemiconductorsKnow what affects their frequency response and you'll find it

A previous article discussed volt-age and current gains in transistorcircuits without making reference tothe frequency of the signal amplified.Measurements show that a transis-tor's ability to amplify decreases asthe signal frequency increases. Thefrequency at which the gain dropsto 0.707 (1/2 ) its value at 1 kHzis called the cutoff frequency. This isequivalent to a signal drop of 3db.

As previously indicated, the sig-nal gain in a common -base circuit(in)) is the ratio of the emitter and

Acollector current signals (A

IEc). The

cutoff frequency for this circuit isexpressed as fa or fbm.

The signal gainemitter circuit (hre) is the ratio ofthe base and collector current sig-

nals(Ic) . In this circuit the cutoff

frequency at which the gain hasdropped 3db is expressed as fbeta orfate.

The effect a signal's frequency hason a transistor's gain is shown inFig. 1. The common -base cutoff

hre

hat

01

102 bs 1105 10575310 rexx0fht fT

RELATIVE FREQUENCY

107 1053x10'fhfb

Fig. 1-Transistor gain is reduced at higherfrequencies.

frequency (Gib) is higher than thecommon -emitter cutoff frequency(fbre) and is more often used todescribe the characteristics of atransistor.

The gain -bandwidth product is themost commonly used measure of atransistor's frequency response. It isthe frequency (fT) at which the com-mon -emitter signal gain (hre) equalsone. This frequency is usually deter-mined by measuring the current gainnear b.fe and extrapolating at -6dbper octave. When logarithmic scalesare used in a graph as shown inFig. 1 to represent gain and fre-quency, a -6db per -octave slope isrepresented by a 45deg. angle. Aline was drawn from the value ofhre at N. at a 45deg. angle to ex-trapolate the value of fT.

Today's transistors have an fbre,fT and fhib frequency response rang-ing from 0.12, 12 and 18MHz,respectively, for germanium alloytransistors to 50MHz, through 1.7and 2.5GHz for silicon diffusedtransistors.

Two Factors LimitHigh Frequency Response

The base in an NPN transistorcircuit (Fig. 2) is more positive than

Fig. 2-Base-to emitter junctions are forwardbiased while base -to -collector junctions arereverse biased.

the emitter and, therefore, the base-to -emitter junction is forwardbiased. In this circuit the base is


4

from A to Zeasier to service transistor circuits

less positive than the collector and,therefore, the base -to -collector junc-tion is reverse biased. (The samebias conditions occur in a PNPtransistor circuit containing volt-ages of opposite polarity.) Reversebiased semiconductor junctions de-velop a "diffusion capacity" that isdirectly proportional to the area ofthe junction and inversely propor-tional to the square root or cuberoot of the voltage applied.

Since only the base -to -collectorjunction is reverse biased, it is thisjunction that contains a noticeablecapacitance. This capacitance isrepresented by Cbe and generallyranges from 1 to 50pf.

The base -to -collector capacitancehas an adverse effect on the fre-quency response of the transistorcircuit shown in Fig. 3. As indicated

Fig. 3-Transistor gain is reduced by thetransistor's internal capacitance.

in a previous article, the input in acommon emitter circuit is normallyinverted at the output. The capaci-tance (Cbe) couples this output withthe input. Since the output signalis the inverse of the input signal, itreduces the input signal (negativefeedback), reducing the circuit'sgain.

Capacitor (CO provides a signalopposing the input signal and morebase current (IB) is required to pro-vide an output signal of the sameamplitude. This condition has the

effect of decreasing the transistor'sbase -to -emitter impedance.

The feedback resulting from thetransistor's internal capacitance(CO is called the "Miller Effect."This effect can be reduced by low-ering the circuit's input impedanceto match the lower impedance ofthe transistor's base.

The circuit in Fig. 4 is designed

Fig. 4-Transistor infernal capacitance can beneutralized by the circuit.

to "neutralize" the effect of thetransistor's internal capacitance(Cbe) by providing an equal amountof positive feedback. The outputsignal present in the emitter resistor(RE) is in phase with the input sig-nal and can be a source of positivefeedback. This signal is fed to thebase by capacitor Ct.

It has been indicated that thebase -to -collector capacitance affectsthe transistor's frequency response,and that the amount of this capaci-tance (Cbe) is dependent on thereverse bias of the base -to -collectorjunction. For this reason, the tran-sistor's gain bandwidth varies withthe collector -to -emitter voltage(VCE) and collector current (Ic).The curves shown in Fig. 5 indicatehow voltage and current combina-tions increase or decrease a transis-tor's frequency response.

cylo?

65

4

3

2

TYPICAL COLLECTOR -CURRENTCHARACTERISTICS

ouo370

380,

fr 36040

1005 10 15 20 25 30 35 40 45 50

COLLECTOR -TO -EMITTER VOLTS Ms)

Fig. 5-Voltage and current combinations canaffect a transistor's frequency response.

Transistors require a finite timefor the current to pass across thebase from the emitter to the collec-tor. This "transit time" is dependenton the thickness of the base region.A typical germanium alloy transis-tor has a 0.001 in. base, a 0.002sectransit time and a 3MHz fhn, cutofffrequency. A silicon diffused tran-sistor may have a 0.0001in. basethickness and a fhn, cutoff frequencyof 150MHz.

The delay that a signal experi-ences when passing through thebase results in a phase shift. Thehigher the signal's frequency, thegreater the phase shift resultingfront this delay. Slight variations inthe distance that signals must

BASE SIGNAL

COLLECTOR SIGNAL

--- WAAL KIIOSS NARROWER SASE----SIGNAL ACROSS w EASE

TOTAL 412U,NG S..NALAsIPUTUCC NITFPUT- PHASE Mil

Fig. 6-Varying phase shifts can reduce thecollector signal.

NOVEMBER 1966 49

An Oregon service -dealertells how he's doing a

quarter -million grossbusiness this year

SERVICE BEDROCKS SALES

The more things change, the morethey remain the same when it comesto sales and service, says Vern L.Wenger, Portland, Oregon.

Mr. Wenger proudly advertises"Serving Portland Folks Since1908." That makes him the dean ofPortland service -dealers and one ofthe nation's oldest purveyors ofhome entertainment sales and serv-ice still active in the business.

"The buying public doesn't knownow and never did know what's in-volved in producing home entertain-ment," Mr. Wenger declares. "Itdoes know when the performance issatisfactory-and the public alsowants top service.

"Basically, from the customer'sview, there's no fundamental dif-ference between today's servicingconcepts and those of fifty to sixtyyears ago in the days of mechanicalsound reproduction. Service is thefoundation on which sales rest forsmall and medium-sized dealers."

Personal AttentionBasing sales on personal attention

to service, Vern L. Wenger Co. willtop $250,000 in gross sales this year,comments Mr. Wenger's son, Bob,who is active in the business carry-ing on the traditions established byhis father during the past 58 years.The gross will break down to ap-proximately 70 percent sales and 30percent service.

Mr. Wenger, Sr., was a journey-man machinist when he went towork for a Portland phonographcompany in the days of cylinder(Edison -type) records. He startedhis own business in 1918 and in1920 introduced crystal detectorradios to the Portland area. With theupsurge in radio listening whichcame with the introduction of dy-namic speakers, Mr. Wenger put abig horn right out on the sidewalkwhere it could be heard for blocksaround.

"We can't get away with this to-

day," he smiles, "but good use ofpoint -of -sale methods is still an im-portant way to attract attention.

"When we went into color TVeight years ago, we put the word`color' all over the windows. We hada large sign running across the en-tire top of the windows, movingsigns bouncing up and down in thewindows, and so on, to attract at-tention. Color today is more of ashot in the arm to dealers thansuperheterodyne was in its day, butwe're using just about the samemethods as we did then to cultivatemarkets."

Direct Mail PromotionThe father and son team base

their market cultivation on directmail.

Says Bob Wenger: "We're notout to do the biggest volume in Port-land and, consequently, are not bigusers of newspaper advertising. It'sour conviction gained through yearsof experience in merchandisingphonographs, radios, and TVs thatdirect mail is the best advertisingmethod for service -dealers to buildsales and service."

No yearly direct -mail schedule isset up although the heaviest salesadvertising is done in the fall andservice is promoted in the summer.

A mid -September mailing pieceand another in November calls at-tention to new merchandise and newdevelopments in TV and stereo.

"Autumn is the time when po-tential customers are settling in for


Bob Wenger tunes in a set for a demon ion. He reports that *aminocustomers to gel the most cut of (heir sets is the decisive follow-up on sales-satisfied customers.

the winter months," Bob Wengerpoints out. "You can't hypo themarket when people aren't ready tobuy. You get the best results whenthey're thinking about buying."

The best time for us to send outa direct mailer on service is earlysummer, and the approach that getsthe best response for us is a "Sum-mer TV Service Special."

Last summer's special, offered at"Only $5.95," covered: "tubechecks, tuner cleaning, CRT clean-ing (if protection glass can be re-moved), adjust entire set (B/W)for best picture and sound."

The mailer concluded: "We arealso specialists on color TV service.Call us for prompt service you willlike."

Vern L. Wenger with Mrs. Vivyenne Cromwell whohardles the bookkeeping and office details.

Generally, on both sales and serv-ice, a direct mailing will run around1500 and 2000 names per mailing,rather than flooding the trading areaall at one time. This method, BobWenger points out, enables thedealer to pace his sales and service.

"Our winter sales letters firstpoint out that we've just receivedthe latest color TV models thenexplains that we have them on dis-play. We always go on to say that ifit's hard for the reader to get to thestore we'll be happy to go to hishome to show him new models andexplain new features.

"In all such general sales letters,we always mention that we haveskilled technicians to see that theset works perfectly."

A well -signeddowntown locationhelps build traffic forPortland's oldestservice -dealer.

Pinpointing Markets

In addition to general letters onboth sales and service, the companyfinds that direct mail slanted tospecific markets brings good results.As an example of this type of mail-ing, Bob Wenger cites a mailing of100 letters sent to tenants of Ter-williger Plaza, a retirement center.Names were selected at randomfrom the list of tenants.

The letter read in part: "Here fora limited time is a special offer tothe folks at the Terwilliger Plaza-a two-day free trial of a color TV,in your own apartment.

"Here is a chance to see howcolor looks in your own home-there is no obligation-all you do

NOVEMBER 196653

is phone us and on two days ofyour choosing we will see that youhave color."

The letter points out that Wen-ger's is the oldest service -dealer inthe city and requests recipients to"tell your friends that live in thePlaza about this because our list ofnames is not complete."

This direct appeal to the "folks"in the retirement center brought thebest results per letter ever received,indicating that direct mail to retiredpeople of above -average incomeoffers considerable possibilities forcolor sales. As a consequence, thedealer is now building up a mailinglist of these people to develop abroader program of mailings pin-pointed toward retired senior citi-zens.

Youth Market

The youth market, Bob Wengercontinues, is another market areathat can be effectively cultivated bydirect mail pinpointed toward newly-weds.

"According to our early experi-ence, newlyweds are going forstereo," he says. "A good stereo, anice TV set or a combination homeentertainment center, is one of thefirst things they want when they be-gin housekeeping.

"We're working with a specialistwho gets up a list of newlyweds.We've just started our mailings andit will take awhile to determine justhow prolific this market is, but earlyindications are that special effortsto reach the newlyweds will pay offfor us."

One problem the company is en -

SERVICE BEDROCKS SALES

Wenger's service technicians have their own customers because management has found thatmany people like to have the same technician on every call. And management buys everythingthe service technicians say they need to do too work.

countering in reaching special mar-kets is in connection with its down-town location. For this reason, thefather and son team is now consid-ering the possibility of moving thestore to one of Portland's outlyingareas where major expansion of newhomes and apartments is underway.

The downtown location - andthe company has been in the sameblock ever since 1939 - has sometraffic advantages, however. Oneadvantage is that used merchandisecan be turned over rapidly. Somesets taken on trade-in are repairedbefore being offered for sale, othersare sold "as is."

Used Set Sales

"We wait until we get about sixto ten used sets on hand," Bob Wen-ger says. "Then we put them all inthe window at one time with a bigsale sign on the window. Since weare in a heavy -traffic location, theword gets around fast and we movethem right out without having tospend any money on advertising."

More and more families are be-coming two- and three -TV owners,the Wengers find. The new color setgoes into the living room and theB/W goes into the children's room.

Often, the family wants a good usedset for the recreation room, and sothere is a substantial market fortrade-ins.

The ability to sell trade-ins easily,with little or no selling costs, meansthe dealer can stay competitive bygoing a little higher on his trade-inallowances. Most people realize thatthe $400 they paid for a B/W setseveral years ago is not worth verymuch now and they don't expect abig trade-in allowance, Bob Wengerreports. But many expect more thanis usually offered them.

"We've tried the flat trade-in al-lowance generally used by the de-partment and furniture stores, thatis, ten dollars or twenty dollars onany set, but people don't like thatvery much," Bob Wenger explains."They like to wheel and deal withyou on the trade-in.

"We set up each deal on an in-dividual basis and are able to makea few dollars on the trade-in bystaging our used TV sales. We'vealso found that the traffic from run-ning used -set sales naturally feedsinto sales of new color sets and intothe service business."

The downtown location alsobrings in considerable radio repairwork. Sets are personally brought in


from all over the trading area, andWenger's probably repairs moresmall radios than anyone in the city.

carries stockof tubes, including tubes for oldersets and on up through the latestmodels, to be able to handle every-thing in radio. Vern Wenger him-self does a good deal of repairing onkitchen radios as well as on recordplayers, which he can handle in hisspare time between working thesales floor. He has a little shop forthe purpose in one corner of thesales floor. Radio repair, it has beenfound, is also a lead into new busi-ness.

Service Shop EfficiencyA service shop, Bob Wenger

says, is no more efficient than themen who do the work. Wenger's hastwo service technicians on a year -around basis, adds an apprentice inthe summer who is always accom-panied by a journeyman when hegoes out on any outside calls.

"We make a big point that all ourservice is handled by fully qualifiedelectronic technicians," Bob Wengersays. "When it comes to the serviceshop, we don't tell the men what todo-we let them tell us what to do.A good man likes to work effici-

Service technician Bob Salvus at work. Wengor's tech-nicians are oldtimers in the business.

Bev Bronson checks out a portable -type TV in Wenger'swelWnstrumented shop.

ently. We have all the latest test in-struments and buy anything theservice technicians say we need."

Both journeymen have been withthe company for more than sevenyears, are paid the union scale, andare given the opportunity to makea little extra money by turning insales leads.

The dealer's prices on servicecalls are $6.95 on B/W, $7.50 oncolor-a flat charge.

"We make it a point to note onour copy of the service ticket whichtechnician handles a call," BobWenger says. "Some customersalways want the same man to handletheir service calls and our customerbecomes his customer, so to speak."

This customized service approachenables service technicians to get toknow their customers and puts themin a good position to discuss a newset. When a customer is ready tobuy a new set, the service tech-nician reports it to the office andBob Wenger goes to the home andtalks with the customer. When thesale is made, the service technicianreceives a commission on the sale.

After -sale Follow-upYoung people are not so much of

a "training problem" when it comes

to showing them how to use theirnew set-they've grown up withTV. But some training is oftennecessary with the older folks and,in many instances, some psychologi-cal selling is required after the setgoes in, particularly on color.

"Often, the older folks are a lit-tle afraid of the color set and haveto be shown a number of times howto operate it properly," Bob Wengersmiles. "We always make a strongpoint of insisting that they call usif they have any questions. Then wego out and go over it with themagain.

"This isn't time wasted. It's agood business practice which makessatisfied customers. In one instancerecently, we had to spend severalhours in showing a man and hiswife how to operate the set, thenhad to go back again for further in-struction. But they were so enthusi-astic about us that they sent in theirfather-in-law who bought a $550 setfrom us."

A generous use of Bob Wenger'stime in working with those who havepurchased sets gives Wenger's astrong service identity and leavesservice technicians free to concen-trate on repair work. Bob also goes

continued on page 94

NOVEMBER 1966 55

There will be close to 100 percent color on the threemajor TV networks this fall. Last year NBC

offered almost all its programs in color, this is the firstseason that ABC and CBS are competing with NBC,

although NBC will telecast 1000 more hours ofcolor than the two combined. As a result, retailers can

expect even more sales in color this year.Most companies are hiking their prices on new colorsets, mainly on the middle and upper end of 25in.

color lines, the increase comes about primarily becauseof higher prices for basic raw materials like

copper, steel, cabinetry and plastic, according tomanufacturers. But it is felt that the increase will not

affect sales.Some major CRT manufacturers have announced

discontinued production on B/W TV tubes toconcentrate full production facilities on color CRTs.

Smaller, lighter portables seem to be the trend for thefall and Christmas season.

Admiral has introduced a new 9in. portable, sellingfor $69.95. The TV weighs only 121b, has a

"precision crafted chassis," front speaker, monopoleantenna and carrying handle. Known as the PN904,

it will be featured in 85 major markets.Industry officials estimate that less than one percent of

Canada's 5.3 million television sets can receivecolor programs and forecast color sales this year of

65,000 sets. Industry expects to sell 1.3 millioncolor sets by the end of 1970.

With the increase of color sets it will mean moreservice work for Canadian TV technicians.

00!0102CAMM

14 91101

"ahi.7T. I %aw MI.

j INMATES COLOR VOLTAGE

ALL 10.021$ NEASOND MTN SLICK S 0.1-11E 51655. Mµ5550140,SE NOTED

Fig. I - Hoffman's "color castor" circuit.

Manufacturers say raw material prices result in

Review ofHOFFMAN

Hoffman's color chassis 913-000366 is used in all23 and 25in. sets, basically the same as last year. Em-ploying the Standard Kollsman VHF tuner and threestage video IF, UHF tuning is simplified from last year'stwo control, two speed tuner to a one control and onespeed transistorized tuner. A new 19in. color portableis planned this fall.

Chroma bandpass amplifier. The basic color cir-cuits remain the same. A 6GH8 is used as a bandpassamplifier and the plate of this circuit incorporates the"Colorcaster" indicator lights. These are fired by twotransistors, connected in a Go/No/Go circuit (Fig. 1).when the bandpass amp is conducting. A bias controlis used for "Colorcaster" sensitivity adjusting. Threelights illuminate the color controls: INTENSITY, TINTand CINEMA, during color transmission. The CINEMAvaries the gray setting to customer preference. A colordefeat switch, to kill extraneous color during blackand white transmission, is located in the secondaryof the bandpass amplifier transformer.

Power supply. This year's chassis has a four-way

CHASSIS NO. 913-000366

Fig. 2-Hoffman's power supply circuit.


color set price increases

1961 TV Setsbridge instead of two silicon rectifiers as in last year's(Fig. 2). A circuit breaker is in the power transformersecondary and a fuse has been placed in the B+ lineto the HV circuit.

The new chassis employs a circuit called "Instavi-sion" which keeps the tube filaments at a low voltagelevel for instant sound. The picture follows withineight seconds. More reactance is injected and obtained,from a tap on the power transformer primary. (Lastyear's chassis used a separate reactor.) When the setis off, B+ and the dial light circuits are open and onlythe secondary to the tube heaters is in the circuit. Amanual "vacation" switch is on the back apron if thecustomer desires to use the set in a normal mode.

Provisions are made for adding a three functionwireless remote control having a transistorized receiver.Being a sonic type control, installation is accomplishedin approximately 15min. The remote has ON/OFF,three volume steps and channel change and comes in apackaged kit.

A plug-in tuner and control panel assembly foreasy removal, are incorporated in the new line. Twoconnectors (one a 12 -pin the other a 15 -pin) plus thevideo cable are used to connect this unit to the mainchassis.

MOTOROLA

Motorola's TS918 color chassis, for the most part,is identical electrically to the TSA914 which has beenin the field for some time. The chassis is an improvedversion, employing the same basic circuitry and thesame receiving tube types.

The 1967 color line consists of 46 models and in-cludes three CRT sizes. The 46 models include 13 inthe premier series carried over from last year. The 21in.models use a newly developed CRT.

Some of the new features added to the line are:All CRTs use rare earth phosphor, sets have horizontalpincushion corrector circuits, four CRKT switch typeVHF tuners and numbered color controls for customerconvenience.

Service features added to the new line are: Upfront convergence on all models, serviceable conver-gence panel without removing chassis, two slideswitches added to replace jumper wires, removablefront escutcheon on 21in. models for easy dial lightreplacement and alignment stud on bezel for easy con-trol panel alignment.

Horizontal pincushion corrector circuit. A portion

HORIZOUTPUT

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T710

56 R512 270K

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& C611

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WA VERTICAL TRAPIZIODAL

PARABOLIC I WAVEFORM

WB BASE OF one

VOLTAGE WAVEFORMWC rJ ACROSS PRI 1710

"---Nr"-\ PARABOLIC I WAVEFORMIN PRI OF T710

WE Z OF T710 SECONDARY

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SCAN

Fig. 3 - Motorola'shorizontal pincushioncircuit with wave-forms.

\ INTRODUCED I

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is

MIN

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VARIABLE 3IN 140RIZ YOKECOILS

PINCUSHION PARABOLIC WAVEFORMERROR ADDED TO Cl OF

HORIZ OUTPUT

NOVEMBER 1966 57

1967TV

SETS

of the vertical trapezoidal waveform (WA - Fig. 3)is integrated by R717 (33K), C512 (.254) and C721(.54) into a negative going parabolic waveform (WF)as shown in Fig. 3. The parabolic waveform is fed tothe control grid of the horizontal output tube throughR512 (270K). Since this waveform is at a verticalrate and negative going, no effect is noted at the topand bottom of raster (Fig. 3). As the negative portionof the parabolic waveform progresses through its ex-cursion, it is applied to the control grid of the hori-zontal output tube and progressively decreases the hori-zontal scan. This introduces sufficient pincushion errorto be equal to the left side of the raster.

Transistor Q702 is a silicon PNP type and is for-ward biased for class A operation.

A trapezoidal waveform (WA) is fed to the top ofhorizontal pincushion corrector control R725 andis coupled into Q702 base through C720 (.22g).

C179 (.047/.40 and R730 (15K) wired betweenbase and collector of Q702 integrates the trapezoidalwaveform into negative going parabolic waveform (WB)and is fed into the base of Q702.

The amplified parabolic current is positive goingin the primary of T710 which is the collector load for0702.

The secondary impedance of the saturable reactor(T710) varies inversely as shown in curve WE.

In Fig. 3, the impedance curve (WE) is related tothe raster. Since the impedance varies as shown at avertical rate, it can be seen that at the top of the raster,the impedance presented in series with the horizontalcoils is maximum which reduces horizontal scan shownby the dotted line. In the center of vertical sweep, theimpedance of the saturable reactor secondary is mini-mum, thereby increasing scan. Likewise, at the bottomof the raster, the impedance is maximum and decreasesscan.

The variable impedance applied in series with thehorizontal yoke coils is symmetrical, thereby correct-ing the pincushion error on both sides of raster asindicated by the straight dotted lines in Fig. 3.

Motorola's 1967 B/W television line consists of

V6A1/2 6KTE1

CATHODE FOLLOWER

250V

100whZ.ZA

5% C50

I'°°

250V

TRI A

121-3E6ev

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"Y" MAR

340r

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00AS750

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Fig. 4-Zenith's Y amplifier drive circuit.

2 2.22R

250V

20 models using five chassis. Fifteen are new modelsand five are models which were introduced last De-cember. Included in the line are two 12in., two 16in.,three 19in., three 21in. and ten 23in. receivers.

The new chassis being presented for the first timeare theTS461 being used in 12in. receivers; the TS -594,used in 21in. receivers.

The TS594 is a transformer powered hybridchassis, employing transistors in the small signal cir-cuits and tubes in the VHF tuner and all output circuits.Transistor circuitry is on an etched board mounted inthe center of a conventional chassis. This chassis isbeing introducted in thirteen receivers.

Some improvements are being employed in presentsets. These include addition of an optimizer controland an improved method of adjusting the video am-plifier bias control.

Optimizer control. The purpose of the optimizeris to reduce the effects of high frequency noise in thepicture. In previous tube type receivers, the optimizercontrol varied the 2nd detector load which effected achange in video high frequency response. The TS5942nd detector circuit is closely related to the bias forthe video amplifier stages, a different method of ef-fecting a video high frequency roll off is employed.The optimizer control is a 750 0 pot installed in serieswith the base of the 2nd video amplifier stage.

The optimizer control effects a gain reduction forhigh video frequencies by causing a reduction of highfrequency information applied to the base emitterjunction of the 2nd video amplifier stage. This is dueto the effective base to ground capacity which repre-sents a frequency sensitive impedance (input capacity)across the input to the 2nd video amplifier stage. Aslong as the resistance in series with this input capacityis low, most of the input signal will be developed acrossthe input capacity. However, if the series resistance isincreased, some of the applied voltage will be developedacross the series resistance as well as the input capacity.The ratio of the voltage developed across the seriesresistance and the input capacity will be a function of


their respective impedances. At low frequencies, theinput capacity will be the largest impedance so mostof the low frequency information will be developedacross the input capacity. However, at high frequencies,the input capacity represents a smaller impedance somore of the high frequency information will be de-veloped across the series resistance.

ZENITH

Zenith's new 23X36 chassis has many circuit modi-fications over the previous model, plus a transistor formore video drive to the cathodes of the CRT. Newtubes are used and alignment procedures for the coloramplifier and demodulator circuits has been modified.A pulse -controlled high voltage regulator system isused.

Additional Y amplifier driver (transistor). Addi-tional video drive to the cathodes of the CRT is pro-vided by a transistor driver stage between the outputof the cathode follower and Yamplifier tube. (See Fig.4). This transistor provides a signal gain of approxi-mately three. The video output at test point CI isapproximately 6v P -P and is coupled to the cathodefollower stage. Since the gain of a cathode followeris always less than one, approximately 3v P -P is cou-pled to the transistor driver. With a voltage gain ofthree through the driver, approximately 9v P -P is fedto the 12HL7 Y amplifier.

Color receivers prior to this series chassis fedabout 3v P -P to the Y amplifier (6v P -P at test pointCl).

The transistor used in this application is part No.121-366. To have the proper video polarity to theCRT, the picture detector diode is reversed in com-parison to previous chassis.

12HL7 amplifier. A new 12HL7 tube is used,similar to a 12GN7A but with only half (approxi-mately) the transconductance, providing excellent gainand stability. To provide the additional video driveto the cathodes of the CRT, plate voltage to the12HL7 is increased. This is accomplished by the "ex-tra" power supply between the 350v B+ bus and the12HL7 plate. In this manner, approximately 80 to100v additional is added to the 350v B+ bus and the12HL7 plate.

Video Peaking. Additional video peaking coils areused throughout the "Y" circuitry (from the videodetector to the CRT cathodes). Improved peaking withthe PEAK Puc control is accomplished in part by theaddition of a peaking coil in series with the B and Ggain controls.

Increased screen (G2) voltages. The G2 voltages(CRT screens) have been increased. To accomplish this,a "Boost -Boost" voltage rectifier is incorporated in thehorizontal sweep section. Boost voltage is coupled toa selenium rectifier providing 1200v of "boost -boost."

This is applied to the G2 controls. To limit the voltageacross the controls, they are returned through a 120K,1w resistor to the 350v B+ bus.

Color alignment and circuitry. Alignment of the coloramplifier and demodulator circuits has been modifiedfor the 23XC36, 23XC38, and 23XC38Z series chassis.Dc coupling has been improved, and two new 6ME8demodulator tubes replace the previously used 6JH8tubes. The internal plate construction of the 6ME8tube gently reduces secondary emission. The 6ME8,although similar to the 6JH8, is not interchangeablebecause of differences in operating characteristics.

The G -Y matrix (output circuit of the R -Y andB -Y demodulators) has been modified to produce im-proved flesh tone reproduction. Also, the demodulatoralignment (injection coil, quadrature adjustment) isaligned to approximately 100-105deg. Earlier chassisprior to this series were aligned for 90deg.

Demodulator alignment data has been modifiedfor the 100-105deg injection separation.

Pulse -controlled high voltage regulation. A newpulse -controlled high voltage regulator system is usedin the 23XC36, 23XC38, and 23XC38Z series chassis.As in any high voltage regulator system, its purposeis to maintain (regulate) the high voltage for the CRTat a constant value dining brightness (beam current)changes. In this circuit (6HS5) regulation is accom-plished by maintaining the pulse applied to the HV

ing brightness changes and thus, maintaining a con-stant high voltage. Circuit operation is as follows:

For a given brightness condition, the HV sweeptransformer (primary and tertiary windings) are loadedto a given power value. For this particular condition,we will assume high voltage to be 25kv. The primarywinding is loaded by the regulator tube and the tertiary(HV) winding by the HV rectifier and CRT.

As brightness increases, the tertiary winding loadincreases. By transformer action, this load is reflectedto the primary winding resulting in less primary ringing.Since conduction of the damper tube is dependent uponthe primary ringing (directly proportional), its conduc-tion decreases. This results in decreased boost voltage.This decrease in boost voltage is coupled to the gridof the regulator tube causing a decrease in regulatortube conduction and increasing its plate voltage. Thisdecreases the loading of the primary winding and thus,tends to increase (or maintain constant) the pulse am-plitude to the HV rectifier. As brightness increases,this pulse would normally (under unregulated condi-tions) decrease and cause a decrease in high voltage.As brightness decreases the opposite action occurs.

Positive pulses occurring during retract time arealso coupled from the horizontal oscillator to the grid ofthe regulator tube. These pulses "gate" the regulatortube "on" during retract time only. Thus, with the regu-lator tube conducting only during the retrace interval,it operates at higher efficiency, lengthens tube life, andvirtually has no effect upon raster width.

NOVEMBER 1966 59

Know these components andincrease your annual income by

replacing and repairing them

PART I OF A TWO-PART SERIES

STEREO HI Fl

TONE -ARMS

CARTRIDGES

AND STYLI

The audio quality from Hi Fispeakers is only as good as theweakest link in the entire system-no better than the poorest com-ponent in the system. The quality ofthe stereo cartridge, stylus or recordcan be completely cancelled bynoise, distortion or hum contri-buted by an inadequate turntable,amplifier or speaker-not to men-tion problems created by poor work-manship in repairs, adjustments andalignments.

Careful attention must be givento manufacturers' service instruc-tions as never before. There areseveral reasons for this. Stereo car-tridges, as one example, are not asinterchangable as in the past. Colorwiring codes, as another example,not only change from model tomodel, but in some instances, fromchanger to changer with the sametype cartridge. Additionally, instal-lation and adjustment of new stereounits are more critical and sensitive.The problems that occur are notdifficult to understand but requirea greater amount of patience andcare.

Stereo Tone Arms

Almost any stereo record changerwill produce higher quality per-formance and improved audio if

Double pressure verification is necessary in this type oftone arm adjustment, having a spring tension scale.

A stereo tonearm that accepts a variety of pickups isalways advantageous.

given a better tone arm. A bettertone arm provides lighter trackingforce and longer stylus, cartridgeand record life.

A good tone arm has severalrequirements. It must move freelyover the surface of the modulatedgroove. It must allow the stylus tosit down easily on the record andto be easily removed from the car-tridge. And it must be designed toaccurately track each groove tan-gentially as it moves inward on therecord.

Not all stereo changer arms reachthe high quality of the "profes-sional" types but, in recent times,they are certainly coming closer.

The floating arm on the newautomatic changers must not be con-fused with the true floating tonearm. This arm literally floats inthe record grooves. The floatingquality of this arm insures againstcareless handling or accidents. Thearm will not drop on the record.Instead, it floats slowly and gently,making damage to the record orthe stylus almost impossible. Fewautomatic stereo record changersuse this type arm when employed inself-contained, or package -typestereo units.

The basic function of the tonearm is simply to permit the trans-

ducer to track the modulated grooveas unobtrusively as possible. Thismeans that the combination of thestylus, cartridge and arm must movewith maximum friction. New stereotone arms are meeting these re-quirements.

Service Problems

Critical areas for tone arms arepivot points, tracking, cartridgemounting and counterbalance. Atone arm that does not track in themodulated groove may have abroken or worn stylus, impropertracking or stylus force or the tonearm may not be vertically correct.One exception may be if the rejec-tion slide is sticking or slugglish.

In those instances where the com-plaint is noisy reproduction, ac-companied by frequent replace-ments of styli or cartridges, thevertical plane of the tone armshould be checked. The tone armmay not be perfectly vertical be-cause of alignment bending at thepivot point. This defect will notonly cause distortion and noise butexcessive record wear will damageone side of the modulated groovewall.

Since the stylus is well concealedwhen playing the record it is dif-ficult to ascertain its angle by vis-

ELECTRONIC TECHNICIAN

The plastic at the pivot point can be brokenif too much upward pressure is applied.

ual examination. Visual inspectioncan be accomplished by placing asmall mirror on the turntable, thenplace the tone arm gently on themirror. The stylus and its reflectionshould be perfectly in line whenviewed from any angle. If thestylus is off slightly, grasp the tonearm near the pivot and twist gentlyin the proper direction. This mayhave to be done several times toachieve perfection. This problemusually occurs because the arm isgrasped while it is traveling inwardto the record.

Although maximum performanceis obtained by excellent counterbal-ancing and retractable cartridges,these have created some adverseproblems. The most common isproper tracking after the unit hasbeen delivered to the home. It mustbe admitted that most will trackexcellently at manufacturers speci-fications, but only under ideal con-ditions. Conditions in the averagehome are far from ideal.

The light weight tone arms aremore susceptible to skipping be-cause of extraneous vibrations. Insome instances, walking in front ofthe unit will cause the stylus toleave the modulated groove. Thisis not caused by a fault in the stereounit, but by weak subflooring in

the home. Greater isolation be-tween the changer and other por-tions of the system does not alwayssolve the problem. In most casesit is found that increasing the stylusforce by one or two grams abovemanufacturers' specifications mini-mized the problem. This is notnormally recommended, however.

Not all tone arms can be raisedhigh enough to connect, repair orinstall the stereo cartridge. This iscaused primarily because most auto-matic changers in self-containedunits are "well" mounted. It ismuch easier to perform repairs byremoving the changer from thecabinet. Attempting to install acartridge or repair cartridge termi-nals in a well -mounted unit mayresult in too much pressure beingapplied in the upward direction andthereby putting a strain on the tonearm's pivot action. This can causeimperfection in the vertical planeor even snap the pivot point. Mostof these pivot areas are made ofplastic and are easily damaged.

Low mass stereo arms and re-tractable cartridges are said to befail-safe-dropping them on a rec-ord will not damage the stylus, car-tridge or record. Experience hasproven that this should not be dem-onstrated with any great zeal orconfidence. In several instances,the stylus did break. And any im-pact to a record is bound to causesome damage even if microscopic.

A stereo tone arm that accepts avariety of pickups is always advan-tageous. Installing a more moderncartridge than the original may im-prove over-all reproduction quality.

An example of an early stereocartridge that used grease dampingcan be used here. The dampingagent flowed onto the stylus after ashort period of time and caused lintto accumulate on the stylus. Inevery instance a different stylepickup was installed with improve-ment in quality and a lengtheningof cartridge life.

Stereo tone arms, with their pen-cil -like shapes, are very slowlybringing to a halt the possibility ofimproving performance by theaforementioned method. At thepresent time exact replacement mustbe made in most stereo automaticchangers.

Stereo Cartridges

A stereo pickup is the heart ofa stereo Hi Fi unit. The transduceremploys the same kind of electricalgeneration as a monophonic unit,except the stereo cartridge musthave two generating mechanismsdriven by a single stylus. Separatesignals are generated within thecartridge for right and left channelsby having two separate voltage gen-erators arranged at an angle withinthe pickup to distinguish the lateraland vertical stylus movements.

Only a pickup with a very highcompliance whose stylus can be dis-placed with very little force canafford to operate under conditionsof very low stylus pressure. Thenew sensitive counterbalances andretractable cartridges are meetingthese requirements.

The new retractable cartridgesare not always easy to install. Thesmall springs for the floating mech-anism are frequently a hinderanceto rapid repair. But most cartridgesare accessible by various methods.Some cartridges can be pulled di-rectly off the arm. These are calledplug -ins. Others are easily removedby releasing the spring clip and someby either removing a small screwunder the tone arm and turning thecomplete arm, or pick-up head.

Despite the rugged nature ofthese stereo cartridges, replacementsare usually required because ofphysical shock. This occurs whenthe tone arm is dropped accidentallyor is jarred in some other manner.Although many of the cartridgeshave a retractable mechanism anda small bumper at the end of thetone arm, this does not make thementirely fool -proof - eliminatingphysical damage.

The retractable mechanism issimple. Any time the tone arm orstylus force is excessive, the pickupretracts into the tone arm and therubber or plastic bumper at the endof the tone arm absorbs the shockor impact. There are various typesof mechanisms but they are all ba-sically the same regardless of thename used. Technicians should notattempt to demonstrate a stylus' orcartridge's indestructibility in thehome-for reasons that now seemobvious.

NOVEMBER 1966 61

Prompt diagnosis of a patient's suspected heart condition will shortlybe available to rural physicians, hospitals and clinics using Bell Sys-tem's Data -Phone medical sets. Here, in his office in a small town inIowa, Dr. Martin Deakins reads a patient's electrocardiogram while itis being sent over telephone lines to Creighton University's cardiaclaboratory in Omaha, Neb., for interpretation.

Dr. Anthony Cam:co monitors an electrocardiogram coming over Data -Phone medical sets installed at Creighton University cardiac lab. Tech.-nician Ingrid Peters speaks directly with the sending person and obtains the patient's personal data.

ANOTHER OPPORTUNITYFOR ALERT TECHNICIANS

Medical electronic equipment booms asData -Phone brings medical -center serv-ices only minutes away from rural areas

A significant number of medium sized TV -radioservice -dealer operations - amply organized, staffedand instrumented-are engaged in servicing industrialand medical electronic equipment. This type diversi-fication, of course, requires additional capital invest-ments, careful planning and a management who is notafraid of burning some "mid -night oil." And someelectronics technicians are specializing in servicingmedical electronic equipment.

Since Data -Phone services have become available,many rural doctors have installed electrocardiographsfor obtaining heart -condition information direct frommedical -centers in a number of areas. This service isexpected to expand across the country in the not toodistant future. Additionally, doctors throughout thecountry are showing interest in applications of anincreasing variety of electronic instruments alreadybeing manufactured or now under development.

'Heartline'

The electrocardiograph is one medical instrumentjust now coming into its own. The dramatic story ofits use is briefly outlined here.

A person living in a rural area complains to hisdoctor of chest pain. Is it heart trouble? If so, how

serious? What should be the medical treatment? Often,the decision can only be made after a heart specialiststudies an electrocardiogram (ECG, or visual reproduc-tion of heart action). But, for the patient's physician-.far from a medical center and not a cardiologist him-self-mail consultation or trips to a distant city coulddelay diagnosis and treatment for days. But now doc-tors can transmit ECGs over telephone lines to spe-cialists almost anywhere. This service is already beingused in a number of places around the nation today.It works this way:

A doctor prepares a patient for an ECG. Beforebeginning the examination a call is dialed to a heartspecialist or a medical center which is set up to handlethe service. When the call is answered, the electro-cardiograph is connected to Data -Phone service withthe specialist's ECG instrument. During the examina-tion, zigzag squiggles appear on paper tape from elec-trocardiographs at both ends of the link. This tape canthen be analyzed and discussed with the sender.

The Bell Telephone Co. has announced that electro-cardiograph service will be available nation-wide shortly.This service will also be made available to communityhospitals and clinics who do not have staff cardiologistsavailable.


Sencore has done it again-introduced the rightinstrument at the right time at the right price. FM -Stereo Multiplex is here, now, and growing as fastas Color TV. This new field is just waiting for qual-ified men. All you need to start "channelizing"profits your way is the new Sencore EconolineMX11 Channelizer Multiplex Generator. So lightand compact you take it with you on your TV serv-ice calls, and when in the home suggest an align-ment on that FM -Stereo hi-fi in the corner.

So simple to operate, you need no other instru-ment. Just hook up the RF output cable to thereceiver antenna terminals; connect the two speak-er leads in place of the speakers; then read thechannel separation directly on the meters. Twometers with built-in loads substitute directly inplace of speakers. When you flick on the leftchannel switch you have left channel output; nowflip on the right channel switch and you have both.That's all there is to it.

All solid state circuitry-batteryoperated. Feature for feature, dol-lar for dollar, the Sencore MX11Channelizer is your No. 1 buy inmultiplex generators. Sencore haspaved the way-so take the quick-est road to your distributor. Instock now for only

$9950(Less than theprice of a kit.)

HANNELIZEII

PAVES THE VA

10 MED PRI1111%With Simplified FM -Multiplex Servicing

-NO-5

10SEPARATION 0 OB

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LEFT SIGNAL

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OFF '0*.

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RIGHT SIGNAL

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1401I. IN NS

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KER SIGNAL3V RMS ACROSS 80

A Complete FM Stereo Service CenterThe ultimate in multiplex generators for this field that's growing as fast as color TV. Likehaving your own FM stereo transmitter on your bench or service truck.The MX129 produces all signals needed for trouble -shooting and aligning the stereo portionof the FM multiplex receiver. It is a complete trouble -shooting analyzer with a sensitivetransistorized AC voltmeter calibrated in peak to peak volts and decibels. It can be usedas a stereo demonstrator even when no stereo program is being broadcast. With the MX129you can use external sources to modulate the carrier, re -balance the system at any time,and adjust the crystal controlled pilot signal to any level. Instantaneous warm-up-all solidstate, A.C. powered.The Sencore MX129 gives you features comparable to equipment costingup to $350.00, yet its priced at only

1\1C CD1=iNO. MANUFACTURER OF ELEC;,(...., VP1 jt NANCE EQUIPMENT

426 SOUTH WESTGATE DRIVE, ADDISON, ILLINOIS 60101

$169"


63NOVEMBER 1966

This communications and control system provides complete electronic data collettion and memory storage from machines and equipment throughout the plant.

COMMUNICATIONS AND CONTROL EQUIPMENT

FOR INDUSTRIAL PLANTS

A system has been designed to provide plant foremen withadditional flexibility when doing routine assignments.

Ford Motor Co.'s Philco Electronics Group has de-veloped a communications and control system (CCS)for industrial plants called the Philco 7100. It has beeninstalled in the Ford steering gear and cold headingplant at Indianapolis, Ind.

The system offers complete electronic data collec-tion and memory storage from machines and equipmentthroughout the plant. It provides direct -line communi-cations between production areas and the central con-trol room, and includes a paging and public addressnetwork.

The heart of the 7100 system is a control and dis-play center where information may be gathered fromup to 600 machines connected to the equipment. Anilluminated display board provides a visual indicationof each machine's operational status, while a memorydevice records and stores this vital information on mag-netic tape. The stored information includes productioncounts and service requests, providing accurate real-time data on the status and history of equipment.

When a machine or a piece of equipment malfunc-tions, it is automatically detected by the 7100 and thecontrol room operator can immediately take remedialaction. When a machine operator desires assistance,

material or other service, he can, by turning a switchon a station monitoring box, automatically inform cen-tral control of the service request. Central controlthen pages a foreman, material handler or maintenancecrew, informing them of the type of service required inthe troubled area according to an automatically -printedreport provided by the communications system.

The system is particularly helpful to plant foremen,since it allows them more time for pressing problems byproviding flexibility in accomplishing assignments.

In addition to machine counts, production countsand trouble spotting, the 7100 system automaticallydetects idle time, provides automatic interim reportingand shift summary reporting on production-automati-cally sounding alarms for off -standard conditions. Itcan also be used in conjunction with other data han-dling systems.

More than 387,000 ft of wiring and 48,000 con-nections were implemented in installing the system.

Other Ford installations scheduled to receive the7100 system include four General Parts Div. plants atRawsonville, Ypsilianti and Saline, Mich. and San-dusky, Ohio; and the Transmission and Chassis Div.'splant in Sterling, Mich.


It's time you too switched to Sencore and saved $100in the bargain. The new LO -BOY is a solid Sencore value- already selling at the rate of one every 8 minutes.

Small wonder. The LO -BOY outperforms the highest pricedunit on the market . . . and gives you all this: Tenstandard RCA licensed color bars; NTSC phased colors. All the patterns found on more expensive generators-crosshatch, individual vertical and horizontal lines, andadjustable white dots ... all at the flick of a switch. Nolines missing on crosshatch -14 horizontal and 10 vertical,same as our more expensive models. Interlace control-a Sencore "first." Stops dot bounce that varies from setto set. Rugged all steel construction with tough scuff -resistant vinyl finish. LO in silhouette-not much biggerthan a cigar box. LO in warm-up time. All solid statedesign. LO in troubles. All new patent pending countingcircuits using new silicon transistors. Crystal controlledtimers for the utmost in stability.

Timer controls brought right out on the front panel assimple operators controls. Adjusted as easily as the hori-zontal and vertical hold controls on a TV set, if theyshould ever jump. Absolutely eliminates timer instability.

Compare these features and you'll decide in less than 8minutes that you need a new Sencore Lo -Boy.

SENCORE CGIO. All solid state. New zener regulated batterypower supply with long life "C" cells. The 12 volt battery supplycan wear down to nearly 9 volts before the circuits are affected.New leakproof battery holders permit easy bat-tery replacement without dismantling the unit.You don't have to hunt for a place to plug it in.Priced at less than the cost of a kit. Only

$895°

SENCORE CG138. A performance giant just like the CG10 exceptAC operated with a zener regulated power supply for addedstability even with line voltage variations. Has4.5 me crystal controlled signal for fine tuningas recommended by color set manufacturers.

Only109"

CG10

Every 8 Minutes ofEvery Business Day

SOMEONEBUYS

A NEW SENCORELO -BOY

STANDARD COLORBAR GENERATOR

See America's most completeat your Distributor's now.

line of professional test instruments

NO. 1 MANUFACTURER OF ELECTRPN/C MAINTENANCE EQUIPMENT

426 SOUTH WESTGATF DRIVE, ADDISON, ILLINOIS 60101

. for more details circle 143 on postcard

NOVEMBER 1966 65

TEST TRANSISTORSTRANSISTORSIN SECONDS

in circuit

Also check alltransistors, diodes,and rectifiers out

of circuit for true AC betaand Icbo leakage.

Your best answer for solid state servicing, produc-tion line testing, quality control and design.Sencore has developed a new, dynamic in -circuit transistortester that really works-the TR139-that lets you check anytransistor or diode in -circuit without disconnecting a singlelead. Nothing could be simpler, quicker or more accurate.Also checks all transistors, diodes and rectifiers out of circuit.BETA MEASUREMENTS-Beta is the all-important gain factorof a transistor; compares to the gm of a tube. The SencoreTR139 actually measures the ratio of signal on the base tothat on the collector. This ratio of signal in to signal out istrue AC beta.ICBO MEASUREMENTS-The TR139 also gives you the leak-age current (Icbo) of any transistor in microamps directly onthe meter.DIODE TESTS-Checks both rectifiers and diodes either in orout of the circuit. Measures the actual front to back conduc-tion in micro -amps.COMPLETE PROTECTION-A special circuit protects even themost delicate transistors and diodes, even if the leads areaccidentally hooked up to the wrong terminals.NO SET-UP BOOK-Just hook up any unknown transistor tothe TR139 and it will read true AC beta and Icbo leakage.Determines PNP or NPN types at the flick of a switch.Compare to laboratory testers costing much more.... ;89.50

See America's Most Complete Line of ProfessionalTest Instruments - At Your Distributor Now.

NO. I MANUFACTURER OF El ECTRONIC MAINTENANCE EQUIPMENT

426 SOUTH WESTGATE DRIVE, ADDISON. ILLINOIS 60101


PA For Quarterbacks

The New York Jets may have solved the problem ofcrowd noise that often drowns out the signals theirquarterbacks call at the line of scrimmage.

A specially designed helmet seems to be the answer.The helmet contains a transistorized public addresssystem that boosts the quarterback's voice to aboutthree times the volume of a TV set turned on full blast.The Jets now have four of these helmets ready for use.

Six transistorized speakers solved the problemraised by an American Football League ruling thatprohibited the Jets from using an earlier design that hadused radio -type speakers mounted in outboard pods onthe helmet.

Jensen Manufacturing was contracted by TechnicalMaterials to design a speaker system that would fit in-side the helmet, and thus conform to League rules.They restricted the range of the speakers to voice fre-quencies (900-3000Hz) and boosted the power toabout 50 times normal ratings.

Three speakers over each of the quarterback's ears,

A public address system, contained in the quarterback's helmet, isdesigned to overcome the noise of the crowd.

plus small vents, permit the amplified voice to issuefreely from the helmet. Padded enclosures far from thehelmet webbing protect the quarterback's head frombumping against the speakers or amplifier. All partsof the system, including the speakers, are completelywaterproofed.

When he chooses to call an "audible," at the line ofscrimmage, the quarterback speaks into a small micro-phone fastened firmly to the inside of his face guard.A switch turns off the speakers while signals are calledin the huddle.

More than the lungs of professional football quarter-backs will be saved by the new helmet-countless yardslost each year when confused linemen jump off sideswill be added to the offensive might of the Jets andother teams which adopt the helmet.


A typical scene in the training department of Triplett when a largegroup of technical specialists met for a two-day workshop program.

Training Workshop Held

for Instrument Technicians

Independent instrumentspecialists are taughtmeter design and modificationto handle needs of distributorsand local OEMs

The Triplett Electrical Instrument Co. of Bluffton,Ohio, recently held a two-day workshop and trainingprogram for a large group of technical specialists fromits 30 instrument modification centers across the UnitedStates and Canada.

The instrument specialists were instructed in theintricate assembly and repair of the firm's top qualitysuspension meter movement. New meter designs andconstructions were also discussed. One of the main aimsof the workshop sessions was to provide the specialistswith the precision tools and data they needed to workon the many types of instruments in the field. The com-pany's appointed modification centers are not merelyservice stations for the firm's products-though they doprovide repair service. They are often described as smallmanufacturing facilities that can provide a speciallymodified meter, a non -stock item with unusual per-formance characteristics or a standard meter with a dialdesigned solely for an individual customer. Each cen-ter, though independently owned, serves as a low -volume, custom -production extension of the manufac-turing plant.

In addition to providing repair services, calibrationand modification, the centers carry large instrument andparts inventories for immediate delivery. They per-form a variety of local area services quicker for indus-trial distributors and original equipment manufac-turers.

PINPOINT COLOR TVTROUBLES IN SECONDS ..

manattent

-

1'9lie.

e.". ---....

0 p

WITH THE NEW IMPROVED

SENCORE CA122

COLOR CIRCUIT ANALYZER

It's a standard ten color bar generator; produces verticallines, horizontal lines, crosshatch, and adjustable dots,

PLUS a complete TV analyzer for color and B&W - atless money than color generators only. Here is what the

CA122(B) will do for you by tried and proven signal

injection into these stages.

UNIVERSAL TUNER SUBSTI-TUTE for Color (or B&W).A must to check tuner re-strictiun of RF color signal.

t

EACH IF STAGE to quicklyisolate a stage with lowgain.

VIDEO AMPS from detectorto the CRT tube, op to± 30 VPP.

BANDPASS AND CHROMAAMPS signal injection forcolor trouble isolation.

CHECKOUT COLOR DEMOD-ULATORS for troubles orphase adjustments.

4.5 MC IF for signal in-jection up to the audiodiscriminator.

AUDIO AMPS; 900 cyclesfor injection right up -.o thespeaker.

SYNC CIRCUITS; verticaland horizontal pulses toquickly isolate sync faults.

PLUS:The CA122(B) is not only a colorgenerator and analyzer, but providescolor gun interruptors for purity ad-justments convergence.You get all thisfor only . .. $18150

See your distributor today. He has the CA122 B. in stock now.

426 SOUTH WESTCATE DRIVE ADDISON, ILLINOIS


NOVEMBER 1966 69

FOR MORE

NEW PRODUCTSINFORMATION CIRCLE NEW PRODUCT NUMBERS ON POSTCARD INSIDE LAST COVER.

Two -Channel Transceiver 700Announced is a portable CB trans-

ceiver featuring a standby position for

low battery drain, sensitive to an alerttone signal. The 10 transistor circuit ispowered by 6 penlight batterier. Price$24.95. Lafayette.

Turntable 701Announced is an automatic turn-

table with a low -mass pickup re-portedly so well counter -balanced,both vertically and horizontally, thatthe entire turntable can be turned ona bias while playing, without inter-rupting the record. The stylus pres-

sure is controlled by a micrometer -like pressure setting permitting 1/2gadjustments from 0 to 6g. The pick-up arm is supported on horizontalball bearing pivots for minimal verti-cal friction. The turntable acceptseither monophonic or stereo cart-ridges and has an automatic lock tosecure the arm to its rest wheneverthe machine switches off. Retail price$49.50. BSR Limited.

Tape and Head Spray 702A tape and

head spray de-signed to cleanand lubricate taperecorders, is an-nounced. Accord-ing to the release,the spray containsa silicone that

forms a microscopic protective film toprevent excessive tape wear. It isreportedly safe for all tapes, plasticsor other materials used on tape re-corders. Codman Electric Products.

FM Stereo Tuner 703An FM stereo tuner is announced

which features a silver-plated, 3 -fieldeffect transistor front end and an all -

silicon IF section. The tuner is de-signed for a 1.7 to 1.80, sensitivitywith 90db cross modulation rejection,45db selectivity and 40db stereo sepa-ration. Price for kit $189.95, assem-bled $294.95. Scott.

All Glass Rectifiers 704A series of silicon double diffused

all glass rectifiers is announced thatreportedly is capable of deliveringcurrents of up to 1.0a at 100°C andcan withstand 1 kv reverse workingvoltages. The rectifiers feature lowoperating reverse leakage currents atelevated temperatures in addition tocontrolled avalanche characteristicsthat enables them to withstand in -

stantaneous reverse transient powersurges far in excess of their normalratings, the announcement said. Price48 cents. Sylvania.

Mobile CB Antennas 705A spirial-shaped, printed -circuit

coil, waterproofed and suspended in-side a wing -shaped ornamental base,

is a feature of this CB mobile antenna.The quarter -wave antennas are dcgrounded to improve their VSWR.Net prices range from $12 to $25.Antenna Specialists.

CB Transceiver 706A 11/2 lb 100mw CB transceiver

is announced that operates on 6 pen -


Gold Brand tubeslive so longthey hurt

our bu,siness.

They can last 10,000 hours. They survive 10 -g'svibration or 500 -g's impact shock. And with-stand extreme temperatures, high altitudes.

Every Gold Brand tube in Sylvania's com-plete line is this dependable. So even though cus-tomers don't reorder them frequently, they always reorder.

We use our new gold-plating process to make gridsfor these tubes. It forms a strong bond and eliminatesflaking and peeling. Eliminates shorts from these causes.

Rhenium -tungsten heater wire increases ductility andmechanical strength, thus improving heater life.

A heavy insulating coating guards against heater -to-cathode leakage. Bends are coated individually to preventhot spots and shorts.

Cathodes are formed from powdered metals. This waywe can control properties and minimize contaminants.

In fact, we sometimes wonder if we've done too much toour Gold Brand tubes. Sylvania Electronic Tube Division,Electronic Components Group, Seneca Falls, N. Y. 13148.

SYIJVANIASUBSIDIARY OF

GENERAL TELEPHONE & ELECTRONICS GTENOVEMBER 1966

73

...I NEW PRODUCTS

lite batteries and has a separatemicrophone and speaker for tele-phone -like operation. The superhet-

erodyne receiver includes an RF am-plifier stage. Housed in a metal casewith chrome grills, the transceiver hasa switch -controlled squelch, 60in.antenna and 115v adapter jack. Clari-con.

Record Changer 707Announced is a record changer with

a direct reading tracking force dialdesigned to permit cartridge trackingat forces ranging from to 6g. Thestylus and cartridge are adjusted byusing a leadscrew located at the frontof the cartridge unit. Also included is

an illuminated speed indicator for allfour speeds. Price less base and cart-ridge $149.50. Benjamin.

Regulated Power Supply 708A transistorized zener reference

regulated power supply is availablein factory assembled or kit form. Itreportedly delivers a continuously var-

iable output from 0-15vdc with use-able currents to 250ma, and regulationbetter than ±.2v. The ac ripple isless than 5mv for outputs to 100ma,the report said. Price for kit $13.95,assembled, $19.95. Viking.

Display -Storage Racks 709A rack designed specifically for

displaying radios, TV sets or portableappliances for a maximum visual ad-vantage within a limited space, is an-

nounced. The unit reportedly enablesdealers to double their display areaand thereby effectively increase theirpotential visual exposure. Accordingto the announcement each section is8ft long and 6ft high with 30in.arms, and can support 1100 lb. Therack is assembled from bolted steelsections, and is finished in "safetywhite" baked enamel. Palmer-Shile.

Zenith QualityWavemagnet

Indoor TV AntennaDesigned for finest all -channel (2 to 83) reception in

color or B&W. Special network provides stepped -upbasic dipole impedance, resulting in lower voltage

standing wave ratio than ordinary VHF indoorantennas .. . cuts down snow, reflections and ghosts.

Two full-size UHF loops, one behind the other,develop an unusually high front -to -back ratio (equal

to that in many outdoor antennas), remarkablyreducing ghosts and man-made interference.

Order as Part Number 973-56 from your Zenith distributor.

Built to the quality standardsof Zenith original parts

The quality goes in before the name goes on

74... for more details circle 151 on postcard


EICO 380's

color signals

(3 primaries,

3 complementaries

cove- fully 60%

of th3 screen:

thus tell you

MORE about the

set's response -

enable EXACT

alignment.

BLACK LUMINANCE LEVEL

SHARPLY DEFINED EDGES

BLACK

Now you can afford a True NTSC*Color Generator(NEW EICO ALL SOLID STATE 380 IS ONLY $169.)

Every pro knowsthat the best generator to use to do the best, fastest, most accuratecolor servicing is the NTSC type. EICO is first to bring It to you ata serviceman price.

The 380 takes the risky guesswork out of color servicing - becauseit gives you all test signals exactly like the Color TV station. So nowyou car be certain of exact results - faster, easier, for more profitsper day. You'll also quickly become known as the pro who makessets "come alive" with brilliant correct color response!

Only EICO provides you with all these advanced engineering featuresat so low a cost: 100% true NTSC full -field color signals, includingboth chrominance and luminance exactly as specified for a ColorTV staton transmission. No "Gun Killers" - Faster, easier useby feeding to the RF stage. You don't need to go inside the TV setto feed the color signal. Each true NTSC color signal covers fully60% of the entire TV screen (as compared to 1 -inch from a rainbowgenerator) - this tells you a full, true picture of what's going oninside the set - all the way from the RF to the screen. 100%solid state (33 transistors). 5 individual switch -selected align-ment patterns for monochrome and color, Individual, switch -selected full -field color display. Generates I, Q, R -Y, and 8-Y sig-nals for demodulator adjustment, plus 7 standard color signals (3primaries, 3 complementaries, plus black and white). Adjustablebar wiath and dot size down to just visible for exact convergence. 3 cry.aal-controlled oscillators for true 3.58 MC color signal gen-eration, pattern timing, and RF output. Drift -free RF output (crys-tal -controlled Channel 3) and video output. Conveniently compact:8" high x 5" wide x 6" long. Portable and light weight (only 4 lbs.)for easier field use. Instant -on operation: time -saving, accurate,drift -free. Excellent for field or shop. And will not become obsolete!

Why buy an old-fashioned semi -accurate non-NTSC rainbow gener-ator when you can get all the extra benefits of a 100% TRUE NTSCCOLOR GENERATOR for the same money,

Soo your EICO dealer today for a free demonstration.

Unbeatable Value COMPLETE COLOR /BW TV LABWith the 380 - plus just the 369 & 435 - you're ready for anythingin Color/ BW servicing: EICO 369 Sweep/ Marker Generator giveseasiest, fastest visual alignment of color or B&W TV and FM RFand IF circuits. Five sweep ranges from 3-220mc. Four markerranges from 2-225 mc. Crystal marker oscillator. Post injection ofmarkers. $99.95 kit, $149.95 wired.

EICO 435 Direct -Coupled Wideband Scope. DC-4.5mc with 3" flat -face CRT. Zener calibrator. Outperforms 5" scopes three times itsPrice. $109.95 kit, $159.95 wired.

How about FM -MX Stereo'Just add EICO 342 FM -MX Signal Generator: Gives both compositeaudio and FM RF outputs. Inputs for stereo audio, critical A/ Btests. $149.95 wired.

The NTSC (National Television Systems Committee) color signal Isbased on the fact that each transmitted color is produced by an NTSC-defined relationship between a 3.58 MC reference and a 3.58 MCchroma modulated subcarrier, with each color having a standard NTSCbrightness component. This is the basis upon which all color -TV broad-casters must operate. There are no separate rules for color -TV recep-tion, or color test sets.

EICO EICO Electrcnic Instrument Co., Inc.131-01 39th Ave., Flush ng, N.Y. 11352 ET -11

Send me FREE:

"Definitive Comparison of NTSC and rainbow generators FROMTHE SERVICEMAN'S VIEWPOINT."

32 -page catalog on 200 EICO best buys.

Name of nearest dealer.

NAME

ADDRESS

CITY STATE. ZIP

. . +Or more details circle 118 on postcard

NOVEMBER, 1966 75

to make"AS GOOD AS

NEW"you've gotto put in

a little

for instance. . . when installing replacementspeakers, it makes sense to replacewith a speaker identical to the orig-inal equipment . . . the speaker forwhich the unit was designed. Thisis the one sure way to maintainproper balance in a sound system.

Oxford Transducer Companymanufactures the most completeline of standard replacement speak-ers to O.E.M. specifications, forphonographs, TV, tape recorders,and conventional and transistor ra-dios. Oxford speakers are used bymost manufacturers of consumerelectronic equipment, so you areguaranteed O.E.M. standards.

All speakers are available fromstock, right now. You benefit twoways: from reduced inventories, andfrom assured customer satisfaction.

Write today for your technicalbulletin on Oxford's line of standardreplacement speakers.

Full Rangeof Replacement

and Commerc,alSound Speakers

OXFORD /TRANSDUCERCOMPANY 1 A Division of

Oxford Electric Corporation

3911 S. Michigan Ave.Chicago, Ill. 60653

NEW PRODUCTS

Three -Channel Transceiver 710A lw "walkie talkie" with a 12 -

transistor, 2 -diode superheterodynecircuit and temperature compensatingcomponents (thermistors), is an-nounced. Equipped with earphone

jack, external antenna jack and tele-scopic antenna, the transceiver op-erates on 8 type "Z" penlight batteries.It is designed to operate on 3 CBchannels but is available on specialorder modified for the governmentfrequency 27.575MHz or on CAPfrequency 26.62MHz. Price $47.95.Lafayette.

Crimping Tool 711An adjustable microcrimp tool is

introduced, designed to facilitatecrimping even the smallest contacts.

The tool allows the user to select theprecise crimp -depth setting that suits

=ti the need. The setting is easily deter-mined on a direct reading indicatorlocated on the handle of the tool.

Elliptical Cartridge 712A stereo -mono cartridge is intro-

duced, that is designed for recordplaying systems that require a some-what higher tracking force, 3/4 to 6grams, than is recommended for the

standard 0.2 x 0.9 mil stylus. The cart-ridge's 0.4 x 0.9 mil diamond stylusprovides the advantage of an ellipticalstylus for this type of record playingsystem. The frequency response issaid to be 10Hz to 30kHz with an8.0mv output voltage and 30db chan-nel separation. List price $34.95. Em-pire Scientific.

Inverter 713An all -transistorized inverter is an-

nounced that converts 12 or 24vbattery power to 60Hz 120v ac with

300w continuous power. The inverterweighs 111/2 lb, and measures 51/2 r61/2 x 6 13/16 in. Prices start at$59.95. A remote control unit and400Hz model arc also available. Topaz,

Test Socket Adapters 714A 10 -pin decal

base adapter,used with the new6Y9, 6X9 and6U9 tubes, is in-troduced. It is de-signed to facilitatevoltage and re-sistance measure-ments from tubesockets protected

by captive or telescoping tube shields.The test adapter is tall enough to riseabove the top of a captive tube shield,hence measurements may be takenwithout removing the shield. A tech-nician can insert the adapter into aconcealed socket, plug the tube intothe adapter and take measurementsfrom the exposed test tabs. Othermodels fit 7 -pin, 9 -pin and 10 -pinminiature bases. Pomona Electronics.



What do you dofor an encore afterintroducing the mostexciting solid-state CBline in the business?

.."',"4";,(5#-

'filt.v05,,,lifVet-leovii."144,1WNT4irr

Tag it with a10 year guarantee!

Start with typical Courier pricing. The 23 -channelTR-23S at $169. The 12 -channel TR-12 at $139.Solid-state. Feature packed.

Then add the biggest guarantee in the business -10 full years! The kind of guarantee that sales arebuilt on.

Want more? Courier's sold through limited dealer-ships. Protected territories. Protected mark-ups.Courier CB is no football.

If you're interested in a CB line with profit, with asales -clinching manufacturer's guarantee, quality andfeatures, find out about a Courier CB dealership. Thecoupon brings you all the facts.

@al. electronics communications inc.56 Hamilton Avenue, White Plains, N.Y.

Yes. I'd like to know all about the Courier CBline with the 10 -year guarantee-anddealership opportunities.

Name

Firm

Address

LCItYState Zip

NOVEMBER 1966for more details circle 117 on postcard

77

NEW PRODUCTS

Flat Cable 715A flat cable for telephone and inter-

com applications, is announced. Itfeatures a thin layer of vinyl foamwhich is coated with a pressure sensi-tive adhesive that reportedly adheresto nearly any clean, relatively smoothsurface; tile, metal, wood, stone, etc.The cable and accessories are simplypressed into place. Accessories are

51:11

ScotchflexTILEINONI FLAT CAllti

connected to the cable by laying thecable in place in the accessory and

Dual Purpose Giftfrom Perma-Power

FREE!WITH EITHERBRITENER PACKThe gals call them

SCONCES

You can get one free from your Perma-Power distributor, with your nextpurchase of Vu-Brites or Tu-Brites.

VU-BRITES-the world's best-seller for brighten-ing faded TV pictures. Series or parallel. $9.95 perdozen during this special promotion, and the sconceis free!

TU-BRITES-If the base is right, the boost isright! No other britener gives you this assuranceof the right voltage. 4 Tu-Brites of any base type for$8.95, and the sconce is your extra bonus!

and they love theway they

BRITEN UPany wall with plants

or candlelight

THE BRITE LINEfor brighter TV pictures and bright*?customer smiles ...from

PERMA-POWER COMPANY5740 N. Tripp Avenue Chicago, Illinois 60646 Phone (312) 539-7171


screwing the top of the accessory intoplace. 3M.

Four -In -One Screwdriver 716Announced is a four -in -one screw-

driver which is four screwdrivers inone compact tool. It is designed toeliminate the frustration of findingthe right size or type tool for thejob on hand. There are two inter-

--4=411111111

411=1111100.0

U1111111111mes

changeable bits - one for slottedtype screws, in two sizes, and one forPhillips type, in two sizes. The bitsare made of tool steel while the handleis Tentite plastic. Price $3.49. HabnyProducts.

CB Tranceiver 717An eight -channel, crystal -controlled,

CB transceiver containing 15 silicontransistors and 5 diodes, is announced.The manufacturer has rated the trans-

mitter output at 31/4w minimum out-put, with 0.005% frequency stabilitywhen modulated at -90%, +100%.Specifications indicate the receiver hasa sensitivity of ItLv or less. The unitcomes with carbon microphone, coilcord and a mounting bracket. Thedimensions are 2-5/16 x 5% x 81/4 in.Price $89.95. Regency.

Guy Wire Tightener 718A guy wire tightener is introduced

for use anywhere wire or line needs

tightening. A hook eye is slippedthrough the lip hole, and the wire isrun through the eye and wrapped orknotted around the spindle. NorthCentral Plastics.


FINCO ALL -BAND UHF -VHF -FM ANTENNA

75 OHM Model CX-UVF-24 $72.10 List

FINCO ALL -BAND UHF -VHF -FM ANTENNA

:300 OHM Model UVF-24 $59.95 List

The one antenna that does the work of three! Pullsin beautrul color and crystal clear black and whitepictures on both UHF and VHF channels ... plusthe finest stereaphonic and monophonic FM soundreproduction.

300 -ohm mode s for normal reception areas from$18.50 to $59.95

75 -ohm models for poor reception areas from$42.65 to 572.10F'/Afir7

introduces 75 -ohm COLOR VE-LOG ANTENNASFOR UHF -VHF -FM RECEPTION

Finco's Swept -Element Antenna challenges all com-petit on. Its unique design assures the finest colorand black and white TV reception-plus superb FMand FM Stereo tone quality.

300 ohm models for normal reception areas from$16.95 to $54.50

75-o tm models for poor reception areas from$18.55 to $62.80

FIN:0 SWEPT -ELEMENT VHF FM ANTENNA

75 OHM Model CXVL-10 $43.25 List

FIN:',0 SWEPT -ELEMENT VHF -FM ANTENNA

300 OHM Model VL 10 $34.95 List

FREE! ALL NF ITNECRO CR XA-NVSLFO, CR)(m- UE VR

VHF -UHF

FT RAANNTSEFNONRAMS CR 0 sMp TW ,TRH

OR

VF EF NFD sO p0 TTSEETR:

THE FINNEY COMPANY34 WEST INTERSTATE STREE-, DEPT. 110 BEDFORD, OHIO

NOVEMBER, 1966fcr more details circle 121 on postcard

79

NEW PRODUCTS-4D

Screwdriver Kits 719Two "Plastic View" screwdriver

kits, each containing a regular sizehandle and a selection of interchange-able, single -end, screwdriver blades

are introduced. A spring device isdesigned to hold the blades firmlyand yet allow quick, easy insertionand removal. The handles will acceptany of the interchangeable screwdriver,nutdriver or other blades in the manu-facturer's line. Xcelite.

Solid -State Kits 720Solid-state kits to be sold by service -

CRAFT0 50

''liktik,eI.

dealers to do-it-yourselfers are de-signed to offer beginners an introduc-tion to electronics. The kit builderlearns printed circuit soldering tech-niques, components and terms whileconstructing the kits. Among the kitsoffered are an electronic siren, burglarand fire alarm, intercom, audio poweramplifier, metronome, tremolo, lightflasher, photo cell nite lite, powersupply and code oscillator. Retailprices range from $2.50 to $9.95.EICO.

Ignition Filter Kits 721Announced are kits designed to re-

duce interference caused by ignitionpulses. These kits consist of RL filtersthat snap in place between spark

ADD MILES TO RADIORECEPTION RANGE

ar milmat

xuim ILsh Itisher111.1.11

111.1111.1

we, an. slaalm.

144.04/ROlbsilp$12"

plugs and leads, plus a coil -to -distribu-tor high tension lead. They reportedlyfit all standard gasoline engines andwill not affect the engine's mechanicalor electrical operation. List price,$12.95. Hallett.

ZENITH QUALITYLOUDSPEAKERS ANDBATTERIES

4

Looking for the finest replacementloudspeaker you can find? It's Zenith. . . for practically any purpose:stereo, TV, radio or car radio. Zenithhas sold quality speakers for over45 years. Today you can choosefrom a full line, with each speakeroffering exceptional power and fre-quency response.

Zenith Quality Long Life batterieswith "Transistor Blend" electrolyteare designed for superior perform-ance in transistor radios. Zenith'shigh standards and constant PositiveQuality Control help Zenith bat-teries deliver more power and longerservice for radiosand flashlights.

Order all genuine Zenith replacement parts and accessories from your Zenith distributor.

BUILT TO THE QUALITY STANDARDS OF ZENITH ORIGINAL PARTS

Adi r The quality goes in before the name goes on

80



MODEL 970TRANSISTOR EQUIPMENT

ANALYST

!MK MODEL 970 TRANSISTOR EQUIPMENT ANALYST

14,

IMUICTOt

ite OK AM

SERVICE AM & FMAUTO & TRANSISTOR EQUIPMENT

AT A PROFIT!Jobs that used to be unprofitable now go so quickly that you can makegood money handling them! There are millions of auto radios and tran-sistor radios in the field-portables, auto and table models, plus hi-fiand communications equipment. Instead of turning them away, you canturn them into money-makers with the B&K Model 970 Radio Analyst.

The 970 is effective because it's accurate and complete. Using thefamous B&K signal injection technique, this all -in -one instrument pro-vides the required dc power, lets you test power and signal transistorsin and out of circuit; generates RF and audio signals, and includes arugged, accurate VOM. Four functions in one compact package-withsolid state reliability, B&K professional quality.

LOW INVESTMENT-QUICK RETURNSee your B&K Distributor or write for Catalog AP22-R Net $19995

B & K DIVISION OF DYNASCAN1801 W. BELLE PLAINE AVE. CHICAGO, ILL. 806134?1=11,

Canada: Atlas Radio Corp.. 50 Wingold. Toronto 19. Ont.Export: Empire Exporters. 123 Grand St.. New York 13. U.S.A.

NOVEMBER I 9be

FEATURES:BUILT-IN POWER SUPPLYAuto Radios-High current, low -ripple, fortransistor, hybrid, and vibrator types.Transistor Portables -11/2 to 12 volts forbattery substitution-plus separately vari-able voltage tap for bias.

QUICK AND ACCURATE TESTING OFPOWER AND SIGNAL TRANSISTORSIn-Circuit-stage by stage DC signal injec-tion and sensitive metering of power supplycurrent.Out-of-Circuit-Direct Beta and Leakagemeter scale readings. Easy balancing ormatching.

VERSATILE SIGNAL GENERATORSRF Generators-provide broadcast and IFfrequencies for both AM and FM bands.Audio Generator-for AM or FM modula-tion cf the RF signals, and for trouble-shooting audio circuits.

RUGGED VOMVolt -OH M-Milliammeter-with rugged,taut band meter-provides correct rangesfor easy, fast servicing of all home andauto radios, as well as transistor portables.


81

TWO NEW

"plastic view"screwgriver kitsEASY TO USE, CARRY & STORE

These neat, extremely compact kits fit hippocket, tool box, boat kit, glove compartment... can also be hung on a wall. Durable "PlasticView" zipper case permits instant identificationof tools.

Amber plastic (UL) Service Master handlesare shockproof, breakproof, have patented springholding device that accepts all Xcelite Series 99blades - lets you add tools as needed at mini-mum cost.

Space saving, single -ended interchangeableblades ... can be used with Xcelite extensionsfor extra reach.

99PV-6

Handle and 3 slotted screwdriverblades (.'i6", %", ?if," tips), 2 Phillips (#1, ;2)

99PV-4

Handle and 3 slottedscrewdriver blades

(3i6", ?it," tips)

WRITE FOR CATALOG 166

IlE3InirM!XCELITE, INC., 14 Bank St., Orchard Park, N. Y. 14127

In Canada contact Charles W. Poulton, Ltd.

. . . for more details circle 150 on postcard82

NEW PRODUCTS

Junction Insulators 722A heat -shrinkable, rounded -end cap

for insulating wire terminations,splices and junctions is announced.The end caps are designed to form aquick, permanent insulating bond and

have no sharp edges to cause abrasionto nearby wires. Available in 1/16,1/2, 1/4, 3/8, and 1/tin. expanded IDsizes. When subjected to temperaturesin excess of 275°F they will shrinkmore than 50%. Electronized Chemi-cals Corp.

TV Camera 723A solid-state, vidicon tube, TV cam-

era is announced which reportedly hasa 550 line resolution. It is designed

to be connected to either a videomonitor or the RF section of a stand-ard TV set. The camera comes withan F1.4, 25mm lens, a built-in micro-phone -speaker and an automatic lightcompensator. Tele-Guard.

20kv VOM 724A VOM kit having a total of 57

ranges, starting as low as 0.8vdc isannounced. It contains a range -dou-bler switch that doubles the effective

number of ranges. Price with test leads,batteries and instructions, $39.95 inkit form, $59.95 fully assembled. Al-lied.

Mobile Speaker 725A 75w speaker designed for high

power mobile applications, is an-nounced. The speaker mountingbracket is reportedly aircraft aluminum- cast in one rigid piece for secure,failsafe mounting under severe mobile

service conditions. The bracket hasspace for concealed wire connections.It is designed for the noise -cutting re-production of siren and foghorn sig-nals, or attention -commanding com-munications systems having mobileamplifiers. List price, $83.75. AtlasSound.

Hot Blade Iron 726Announced is a hot blade iron de-

signed for connector rework, removalof components on printed circuitboards, epoxy coated module rework

4111IMIN

and to clear surfaces of end productsthat may have epoxy or flash on spoil-age. The razor -like blade reportedlycuts nylon and plastic fabrics. Pricewith one angle blade, one curvedblade and a gram of high temperaturelubricant, $9.25. MacDonald.


RCA's COLOR TV FASTCHECK "5

Use this procedure to narrow down the trouble area...If the receiver produces anormal black -and -white picturebut no color during a colorbroadcast, try the followingsteps, in order:

1. Tune to a channel broadcasting color, or feed anrf color -bar signal into the antenna terminals.

2. See that the fine-tuning and color (saturation)controls are correctly set.

3. Rotate the color -killer threshold adjustment in thedirection which disables the color -killer stage. Iflocked -in (in sync) color appears, reset this controlas recommended by the set manufacturer.

4. If color appears out of sync, look for trouble in theautomatic frequency and phase control (AFPC)circuits. Use a color -bar generator, and follow theAFPC adjustment procedures described in themanufacturer's service notes.

5, It no color appears, determine whether the coloris lost in the circuits which handle the compositesignal (antenna to bandpass amplifier) or in cir-cuits that handle the separated color signal, asfollows:

6. Feed a color -bar signal into the antenna terminals

and use a scope to check the composite signal atthe video detector.

7. If color -bar waveforms are absent or badly dis-torted, check for trouble, including poor band-pass, between the antenna terminals and videodetector.

8. If color -bar signals are present at the video de-tector, check the burst keyer or separator, band-pass amplifier, color -killer, and the 3.58 MHzoscillator stages and their associated circuits.

9. Once the inoperative stage is found, use voltageand resistance measurements to pinpoint the cir-cuit defect.This ad is still another in a series of color TV serv-ice hints from RCA. To keep your customers satis-fied, always replace with RCA receiving tubes. Yourlocal RCA Distributor is your best source for topquality receiving tubes for color TV.RCA ELECTRONIC COMPONENTS AND DEVICES, HARRISON, N. J.


Plywood Pallets Cut Freight and Fabrication Costs

Shock -proof design eliminates in -transit damage to electronic equipment

Texas Instruments, Inc., of Dal-las, Tex., has cut shipping costsand eliminated in -transit damage toits delicate equipment by usingshock -proof plywood and foam rub-ber floating pallets.

The complex electronic systemsshipped on the pallets include radar,infrared and space componentequipment-used primarily by themilitary.

No pallet failure or shipping dam-age has occurred during a two-yearperiod, the announcement said.

The plywood -foam pallet has alsocut fabrication costs substantially.The pallets also result in lowertransportation costs.

The floating pallet is a sandwichunit consisting of two % or 3/4 in.exterior plywood decks (dependingon weight of the electronic equip-ment being shipped) with a cushion -

Tape deckcontinental

mounted on a palletshipment.

for trans-

ing middle layer of polyurethane,polyethylene foam or hair latex.The cushioning material is selected

according to the weight, size, bear-ing area and equipment fragility.

The whole pallet is bolted to-gether with compression springs onthe bolts to ease the rebound shockof the pallet if it is dropped. Steelstraps slipped under the top deck ofthe pallet secure the part duringshipment. Loosening the bolts thathold the top layer of plywood fa-cilitates sliding the steel strappinginto place under the top panel.

To keep equipment from shift-ing on the pallet, lumber blocking isbolted to the top deck of the palletaround the base of the equipment.Corrugated scuff liners are insertedbetween the blocking and the equip-ment to prevent abrasion.

A typical pallet is made up of a36 x 36in. bottom and 30 x 30in.top plywood deck with cushioningplaced between both decks.

84

New! Deluxe107C Tester!Only tester with "eye" tube to spot

momentary shorts; constant voltage transformer

for greatest stability and accuracy!

Now, Seco brings you a com-pact, portable tube tester un-matched in speed, sensitivityand reliability! "Eye" tube spotsmomentary shorts missed bynormal meter lag-constantvoltage transformer eliminatesneed for "line -adjust", providesproper filament and test volt-ages for superior accuracy. Pat-ented Grid Circuit Test; Dy-namic Mutual Conductance andCathode Emission Tests. 38 -

socket, pre -wired panel accepts80 base arrangements to testmore than 1000 tubes withoutsetup. Replaceable, 10 -socketplug-in panel for complete teston all modern TV,Radio, Hi-Fi, Indus-trial and Foreign;tubes. Model 107C

NEW!thyristor (SCR) analyzer

Checks SCR's, TRIAC's,Breakdown Diodes, GateControlled Switches.Rapid information on:Gate Firing Voltage andCurrent; Peak ForwardVoltage and Current;Peak Reverse Voltageand Current. SlAA so

Model 240 Prt net

NEW !transistor analyzer

Safe, fast, accur ,te-nosetup required. AnalyzesPower and Signal tran-sistors. Dynamic "in -cir-cuit" check; thoroughDC analysis "out -of -cir-cuit". Identify NPN andPNP types as well as leadconnections. Beta testmeasures DC gain-Iceoand lcbo Testsread leakage. Sc So

Model 260 ICUnet

SECO ELECTRON ICS CORP. 1205 South Clover Drive Minneapolis, Minn. 55420... for more details circle 141 on postcard


Even if you've never had aslide rule in your hands before

...you can now start solving electronics problemsfast with this new electronics slide rule and course

HAVE YOU EVER ENVIED the way some fellows whip out a "slip stick"and whiz through a problem in multiplication, division, square

root, logs, etc., instead of struggling through it with pad and pencil?Now you can "outshine" them-even if you've never used a slide

rule before. (If you're already using a conventional slide rule, you'lllearn new tricks with this one.)

You can do, in just a few seconds, not only common mathematicalcalculations but also special electronics problems in resonance andreactance that even a conventional slide rule can't directly answer.

The secret is in this new Electronics Slide Rule and a completehow -to -do -it Course developed especially for men in electronics bythe Cleveland Institute of Electronics.

This is a professional slide rule in every detail, made exclusivelyfor us by Pickett, Inc. It can do everything a regular slide rule can-and more. It has two special scales for solving resonant frequencyproblems and inductive or capacitive reactance problems or any prob-lem involving the factor 27r. On the other side... a unique decimalpoint locator plus useful electronics formulas and conversion factors.Also included is a handsome leather carrying case with a heavy-dutyplastic liner, removable belt -loop, and flip -open cover.

The Course gives you not just printed instruction but personal tu-toring in the use of this lightning -quick calculator. You get four full-length AUTO -PROGRAMMED' lessons which "start from scratch"and teach you with actual examples everything you need to know.These lessons have been carefully designed to meet the same higheducational standards as the electronics career courses for which ourschool is famous. Each lesson you do may be sent in to CIE, where itwill be personally graded by one of our expert instructors the sameday he receives it and returned to you with his comments.

To make friends with career -minded electronics men around thecountry, we have deliberately underpriced the CIE Slide Rule andCourse. The low cost will really surprise you.

Find out more about this remarkable new Slide Rule and Courseand what they can do for you. We have prepared a Free Booklet ex-plaining them in detail. Send for it today. No obligation, of course-just an opportunity to get in on the best offer ever made to people inelectronics. Mail coupon, or write Cleveland Institute of Electronics,Dept. ET -113, 1776 East 17th St., Cleveland, Ohio 44114.

CIE Cleveland Institute of Electronics1776 East 17th Street, Cleveland, Ohio 44114

Acclaimed b) Electronics Experts"it opens a whole new era of quick calculations. Even if younever had a slide rule in your hands before, the four -lesson in-struction course that is included takes you by the hand andleads you from simple calculations right through resonance andreactance problems with hardly a hitch. If you already use aslide rule, you'll find the lessons a first rate refresher course.And they explain in detail the shortcuts built into this newrule." -WAYNE LEMONS, Radio -Electronics

"Why didn't someone think of this before?...the slide rulesaved me time the very first day. The 'refresher' course is amarvel of clarity. I couldn't help being amazed at how manystandard formula functions I was performing the hard way."

-OLIVER P. FERRELL, Editor, Popular Electronics

"I was very intrigued by the 'quickie' electronics problem solu-tions. It is an ingenious technique. The special scales should beof decided value to any technician or engineer. Your slide ruleis a natural."-JOSEPH J. DeFRANCE, Head of Electrical

Technology Dept., New York City Community College.

Mail thiscoupon forFREEBOOKLET

How to Solve Electronics Problems in Seconds

With new Electrontes slide Rule and instruction Course

Cleveland Institute of Electronics1776 East 17th Street. Cleveland, Ohio 44114

Please send me without charge or obligation yourbooklet describing the CIE Electronics Slide Rule andInstruction Course. ALSO FREE if I act at once:a handy pocket-size Electronics Data Guide.

Name(please print)

Address

City State lipAccredited Member National Home Study Council

A Leader In Electronics Training ...Since 1934.ET -113

NOVEMBER 1966


85

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TV Series Shows Space -Age Advances

Program explains developments in scientific knowledge

Television's Don Herbert is be-fore the TV cameras with an adult-level science program called "Ex-periment."

Aimed directly at the general pub-lic as well as scientists and engi-neers, the series includes a programon the laser.

In the televised animation of alaser, a rotating drum memory switchcontrols the symbolic interaction ofelectrons and photons by program-ing 324 lamps representing photonson a demonstration board. It alsocontrols three cork balls, each rep-resenting an electron. As the alum-inum drum of the programer rotateson its axis, actuators located aboutthe perimeter of the drum, trigger 32switch contacts. The contacts aremounted in a bank next to the drumand open or close circuits as re-quired.

The laser demonstration boardhas 27 strips of 12 lamps apiece with27 of the 38 contacts on the pro-gramer selecting the strip of lightsto be illuminated at any given time.Stepping relays, placed between theprogramer and the lamps, are usedto light the 12 lamps on any strip insequence.

Two contacts on the programeralso serve to trigger three leversactivated by solenoids to control themotion of the cork "electrons" inthe televised animation. Three othercontacts control the motion of the"photons" as they move from left toright, right to left or diagonallywhile a 24v solenoid drives the ro-tating programer in predeterminedsteps.

Each program in the series dealswith the work of an individualscientist and his search for new

TV's Don Herbert prepares to film ananimated demonstration to describe laseroperation.

knowledge. Facts and visual materialsupplementing them are presentedsimply and clearly.

The drama of each experimentand its result unfolds step by step,involving the viewer directly. Theviewer becomes more and more in-tellectually involved as these stepsbecome increasingly sophisticated.By the end of the program, theviewer has a clearer understandingof the subject and how it may havean affect on both him and his en-vironment.

Other subjects in the series in-clude the science and engineeringbehind Mariner IV and its success-ful quest for pictures of the planetMars, computerized weather predic-tion, discovery of the invisibleplanet Barnard's Star B, attack pat-terns of sharks, white blood cells,social behavior of chimpanzees andthe Kilauea Volcano.



OK, Watch Watchers !

We want you to time your

next service a l a call

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Buy our Color Commander color bar

generator. If it doesn't save you time,

return the Color Commander within 10 days

and keep the 510.95 Timex.

What makes us so sure you'll save time? Amphenol'sexclusive technique of color alignment. Only Amphenolgives you a:

1. Single cross bar that immediately centers theraster.

2. Single dot for fast, constantly accurate staticconvergence.

3. Three -bar color array that isolates your workingbars-the 3rd, 6th and 9th.

Your Time is Money

If you're spending 45 minutes on a color alignmentjob, the Color Commander technique can cut that toas little as 27 minutes. That could mean two or threemore calls a day-$24-$36 more income. Result: TheColor Commander could pay for itself in two to threeweeks.

Become an Amphenol Watch Watcher

Take advantage of this limited time offer. Cut outthis coupon and beat the Watch Watcher rush. For thename of your nearest Amphenol distributor, write DanO'Connell, Head Watch Watcher, Amphenol, Box 134,Broadview, Illinois 60153.

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Watch Watcher SpecialCount me in on the Watch Watcher Special. Iunderstand I will eet a lightweight, compact,completely solid state Amphenol Model 860*Color Commander along with a Timex watch totime my savings all for $16995

Model 860AC $20.00 higher'1,ric(-_,

AMPHENOLMI Ell INN NM IM I= II

...for more details circle 103 on postcard

NOVEMBER, 1966 87

Language Laboratory A specially equipped, electron-ically controlled laboratory forteaching foreign languages has beeninstalled at Brookline, Mass., HighSchool. It contains 63 student posi-tions: 54 in the language laboratory,8 in the library, and 1 in the foreignlanguage office. All are intercon-nected by a dial telephone system tooffer students up to 60 differentlanguage programs.

Each student records his foreign -

language narration on an individualremotely -located cartridge recorder.The instructor can play back thestudent's recording at the teacher'sconsole or can remove the cartridgeand play it back for evaluation at hisconvenience on a portable tape re-corder.

Dr. Ferdy J. Tagle, Jr., assistantsuperintendent of schools for Brook-line, says the new system providesgrowth capabilities for possible in-

VIAaftdaad

Vie!NY*w

DiscriminatesBetween

DesiredSignal

and

UnwantedNoise.

3 -WayCombination

FREE SPACE

STANDING WAVEMAGNETIC

ANTENNA(UHF -VHF -FM -COLOR)

Here for the first time, is an antenna with theunique ability to discriminate between the desiredsignal and unwanted noise! A complete absence ofminor lobes and an extremely high front to back ratio arecharacteristics of these antennas. This is made possible bythe development of the Free Space Standing Wave MagneticDrive Antenna system (F.S.M.). The outstanding electrical qualities,combined with the simplified mechanical construction of this systemyields a total performance package unparalleled in today's market.4 models, 60 -inch to 180 -inch boom, all modestly priced.

There's a Quality Built S & A Antenna to Meet Every Veed!

SPSA EkeefoitkrManufacturers of the TARGET ANTENNA

204 West Florence St. Phone (419) 693-0528 Toledo, Ohio 43605

terconnection in the future withother schools in the Brookline sys-tem. He said the Raytheon system isalso compatible with video distribu-tion systems and could be extendedto include picture as well as voicetransmissions.

Three teachers will be able to in-struct subdivisions within a groupof 54 students in the lab. A dual in-structor's console at the front of theclassroom permits two teachers tomonitor and instruct individual stu-dents or the entire group while an-other control station at the rear ofthe room interconnects a third in-structor with a portion of the class.Complete student testing facilitiesare incorporated in the system.

The eight stations installed in thelibrary are particularly significant.Just as a student can currently goto the library after class hours andconsult a book, this system permitsthe student to dial the appropriatelesson for make-up work or extradrills in a particular facet of thecourse. A student can draw on awide range of prerecorded languageinstruction materials in a centralprogram library and thereby pro-gress at his own speed.

Programs are in French, German,Spanish and Russian.

STATEMENT REQUIRED BY THE ACT OFOCTOBER 23, 1962, (39 U. S. Code, 4369)SHOWING THE OWNERSHIP, MANAGE-MENT AND CIRCULATION OF ELEC-TRONIC TECHNICIAN published monthly atDuluth, Minnesota for November 1966.

1. The names and addresses of the publisher,editor and managing editor are: Publisher, RonKipp, Ojibway Press, Inc.. 25 West 45th Street,New York, N.Y. 10036, Editor, None, Manag-ing Editor, Jack Hobbs, Ojibway Press, Inc.,Ojibway Building, Duluth. Minn. 55802.

2. The owner is: OJIBWAY PRESS, INC.,Ojibway Building, Duluth, Minn. Royal D. Al -worth, Jr., 1605 Alworth Building, Duluth,Minn.; Robert L. Edge', 5 Indian Point Lane,Westport, Conn.; Albert J. Forman, Wood -brook Drive. Springdale, Conn.; Herschel B.Fryberger, 712 Lonsdale Building, Duluth,Minn.; William B. Fryberger, 712 LonsdaleBuilding, Duluth, Minn.; C. E. Fuller, Jr., 711Alworth Building, Duluth, Minn.; Orrin Henry& Company, Irving Trust Co., 1 Wall St..New York, N.Y.; Verne D. Johnson, Jr 302East Superior Street, Duluth. Minn.; Sr. R.Mason, 212 Medical Arts Building, Duluth,Minn.; Dean Myhran, 1 East First Street,Duluth, Minn.; Jeno F. Paulucci, 200 N. 50thAve. West, Duluth, Minn.; Howard A. Reed,174 Waverly Road, Scarsdale, N.Y.; AnitaReinig, 1 East First Stre,A, Duluth, Minn.;Marshall Reinig, 1 East First Street, Duluth,Minn.; Marshall Reinig, as custodian for JanetReinig, I East First Street, Duluth, Minn.;Mary Anne Reinig, 4514 Connecticut Ave.N.W., Washington, D.C.; L. M. Rosenthal,330 East 49th Street, New York, N.Y.; Mar-tin Wold Company, 7 East First Street, Duluth,Minn.

3. The known bondholders, mortgagees andother security holders owning or holding 1percent or more of total amount of bonds,mortgages, or other securities are: None.

4. The average number of copies of eachissue of this publication sold or distributed,through the mails or otherwise, to paid sub-scribers during the 12 months preceding thedate shown above was: 82,840. Free distribu-teon by mail, carrier or other media: 649.Total distribution: 83489.

(Signature) Dean MyhranVice President -Operations

... for more details circle 140 on postcard88 ELECTRONIC TECHNICIAN

This part speaks for thewhole radio.

This box speaks well of you.

To the listener, the speaker isthe most important part of theradio. Reason enough that it beof the highest quality and reli-ability. And when it says Delcoon the box you can be certainyou've got it: genuine OEM quality.

Delco Radio Parts are designed by engi-neers who specialize in automotive radios.Delco Radio speakers, for example, providegreater efficiency and sensitivity per ounceof magnet than any other speakers built.And since nearly half the cars on the road

Delco

have Delco Radios as originalequipment, you are assured ofa vast pre -sold market.

Doesn't it make sense tostock the best for your cus-tomers?

They know Delco's reputation. So, the nexttime you reorder remember your UnitedDelco Supplier. He handles the most widelyadvertised, merchandised and recognizedname in the parts business.

Why not let Delco Radio speakers saysomething nice about you?

Delco Radio, Division of Goyim' Motors, Kokomo, Indiana.

UnitedIkalrIellec.

NOVEMBER, 196689

JERROLDFREE HANDBOOK

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Here's a book that'll help you cash in on the growing market in master antennasystems for TV showrooms, small motels, hotels, and apartment houses.

You're the logical one to install-and profit from-these small systems, andthis all -new Jerrold Split -Page Handbook gives you help for easy, top-qualityinstallation. This 76 -page book, regularly priced at $1.25, provides over a hun-dred system layouts and describes the equipment needed for each. Jerroldsolid-state systems equipment, including the famous "Gibraltar" series, assureshigh reliability and customer satisfaction.

Clip and hand this coupon to your Jerrold distributor for a free copy of theHandbook. Start now to earn the BIG profits wailing for you in the small -systemsmarket! Jerrold Electronics, Systems Products, Distributor Sales Division, 4th &Walnut Sts., Philadelphia, Pa. 19105.

GIVE THIS COUPON TO YOUR DISTRIBUTORMr. Distributor:Please give me my free copy of the Jerrold Split -Page Handbook ofTV Distribution Systems, which normally sells for $1.25. I understandthere is no obligation.

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JERROLD... the most experienced name

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LETTERSI TO THE EDITOR

continued from page 24

ing to fling their weight or "intel-ligence" around. Neither does itspolicy encourage diversification to thepoint that technicians end up asplumbers helpers. Indeed, your so-called competitors are for somethingone month and against it next month.They have become so diversified intheir coverage that the titles becomemisleading and have little referenceto the article material they publish.

Yours is the best publication withmeaning and purpose to the servicetrade. May you continue as in thepast. Thank you.

GEORGE STRONGStrong's TV & Radio

Chardon, Ohio.

More HelpFor those needing schematics of

"Rider Chanalyst," model 11, we canfurnish schematic and parts list asfollows: One page schematic (with re-sistor and capacitor values included);3 pages parts lists, 78 pages entiremanual. Can reproduce for 500 a page.

SCOTT INSTRUMENT LAB.2222 Broadway

San Diego, Calif. 92102

. . . Tell Paul Christie to write Grun-dig-Triumph, Adler Sales Corp., 75Sedgwick St., Brooklyn 31, N.Y. Theymay be able to furnish him with aschematic for the Grundig tape re-corder.

MARIO ALBABrooklyn, N.Y.

. . . Regarding Mr. R. Cooper Bail-ey's request for a schematic on theScribe Dictaphone, tell him to tryPermaflex Scribe, 333 N. Michigan,Chicago 39, Ill. Phone Fl 6-8582.

HARRIS GREENBERGWestmont, Ill.

A Thank You. . . Because of a mix-up in thepostal system, I did not receive (orhave forwarded) three issues of ET- along with six other magazines Isubscribe to. Of the seven magazines,only ET acknowledged receipt of myletter requesting the copies - andonly ET offered to replace the threeissues I had missed. Yesterday I re-ceived the three issues of ET. all inperfect condition . . . Thank you.

PETER VVIKOPFWilmington, Ohio


Zowie! Here's big news for "Mister Right"-the independ-ent service dealer who carries Sylvania tubes.

Every time you order Sylvania picture or receiving tubesfrom a participating distributor, you receive SylvaniaMeans Business (SMB)-Mister Right dealer certificates.They're redeemable for an exciting selection of gifts. Foryourself, your family, your home.

You get certificates for your purchases of receivingtubes and every SILVER SCREEN 85®, color bright 85" orCOLOR SCREEN 85 picture tube.

So you're a winner in two ways: big profits and top-quality prizes. Sylvania Means Business.

See your participating Sylvania Distributor for all thedetails. Sylvania Electronic Tube Division, ElectronicComponents Group, Seneca Falls, New York 13148.

VANIASUBSIDIARY OF

GENERAL TELEPHONE & ELECTRONICS GTENOVEMBER 1966 91

CATALOGS

AND BULLETINS

CB Transceivers 400Two-color specification sheets give

information on features and accesso-ries for a regular 5w CB transceiverand a 1.5w hand-held type. Amphenol.

Test Instruments 401Three two-color specification sheets

cover features, accessories and appli-cations of a color generator, fieldstrength meter and CRT rejuvenator.Amphenol.

Antennas 402Fixed and mobile antennas designed

for magnetic mounting and coveringfrequencies from 27MHz to 1GHzare described in a catalog. VersaTronics.

Showroom Antenna System 403Solid-state, all -channel antenna dis-

tribution systems designed for dem-onstrating color TV are described.Jerrold.

Console Decorating Handbook 404A full -color 20 -page brochure con-

tains articles on high fidelity, the role

of music in the home, choosing thecorrect console to match individualroom decor and explanations of themore technical aspects of stereo con-soles. Scott.

Paging Amplifier 405A 15w solid-state amplifier designed

for paging is described in an 8 -pagefolder. The amplifier will operate on12v external or internal batteries orwith an ac adapter. American Geloso.

Transistor Cross Reference 406A transistor cross reference sheet

lists over 2900 transistors which it in-dicates can be replaced by but fivetransistors. Workman.

Motors and Controls 407Motors, speed controls, synchron-

ous motors, translators, variable re-ducers, torque controls, impulse count-ers, timers and tachometers are dis-cussed in a 64 -page catalog. B & BMotor and Control.

Switches 408An eight -page, two-color catalog

describes a line of rotary, pushbutton,lever and slide switches. Completespecifications - from finishes to in-sulation materials - for each typeof switch are listed. Oak.

IIMMINIATURE IBA;

SPDTDPDT3PDT4PDT

Designed to meet the highest standardsof reliability, C&K's quality subminiaturetoggle switches combine maximumperformance with small size! They featurerugged construction, simple mounting,excellent appearance, and long,trouble -free operation!

A competitively.pr ced, made -in -America product. Write for literature today!

quality electro-mechanical products103 Morse Street, Watertown, Massachusetts 02172

Telephone; 617 926-0600

COMPONENTS, INC.

$4.95 EachPostage Paid

Soldering Tool 409A four -page bulletin describes a sol-

dering tool that grips as it solders.The tool is designed to solder specialparts frequently inaccessible to ordi-nary soldering irons. Triton.

Slide Switches 410An eight -page catalog describes a

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KG -625 Deluxe 6" Vacuum Tube Voltmeter KitKnight -Kit's best VTVM features 3 -volt full-scale DC range;a pre -aged bridge tube with matched triode sections for easycalibration; single, switchable AC-Ohms/DC test probe; in-verted chassis for quick, easy assembly; 200-microamp move-ment with fluorescent knife-edge pointer. With allparts, battery, test probe and instructions $3995Available factory assembled $59.95

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NOVEMBER 1966 93

CATALOGS

AND BULLETINS

VOM and Panne! Meters 411One 12 -page catalog describes a

complete line of VOM meters whileanother describes pannel meters. Tubetesters, plus a transistor analyzer,transistor tester, signal generator andlaboratory quality meter are also de-scribed. Triplett.

SEMICONDUCTORS . . .


feedback can be used to improvethe high frequency response of atransistor circuit. It can also beused to improve a circuit's low fre-quency response. One method forobtaining such feedback is shownin Fig. 13. Here a portion of theoutput signal passes through a ca-pacitor (C4) and resistor (R3) andis returned to the input. Since a sig-nal is normally inverted when it isamplified in a common emitter cir-

cuit, the returned output signal re-duces the amplitude of the input sig-nal. The circuit is designed so theinput signal has a greater amplitudethan the feedback signal, and theportion of the input signal fed backis neutralized by the input signal.

A portion of the output signal isthe result of internal transistor noiseand distortion. (Transistor signaldistortion was discussed in a previ-ous article.) This portion of the sig-nal fed back is not the inverse ofthe input signal and is not neutral-ized by it. This distortion and noiseremains to be fed into the base ofthe transistor and amplified. Whenamplified, the noise and distortionsignals are inverted and serve topartly neutralize the original noiseand distortion in the circuit's output.

Negative feedback can also beproduced in the circuit shown in Fig.10 by removing capacitor C1. Thesignal voltage (JERE) developedacross the emitter resistor (RE) isthe inverse of the base input signalvoltage. It provides negative feed-back by reducing the total emitter -to -base voltage (VEB) developedby the input signal.

A forthcoming article will discussfield-effect transistors and their re-lated circuits. II

SERVICE BEDROCKS . .


out on repair estimates. This notonly relieves service technicians ofthe responsibility, but has the ad-vantage of keeping the boss in touchwith customers.

Handling Repair EstimatesWenger's won't bring in or take

in an older set unless the ownerOK's repair work up to $25, butthey never surprise anyone with abill, always phoning back beforeproceeding with repairs.

"We make it clear that there willbe a $3.50 charge for an estimate,whether we repair the set or not,"Bob Wenger says. "What we do islist on the back of a service ticketwhat the set needs. If the ownerwants to get an estimate elsewhere,we advise him that he should do so.Since the $3.50 charge for the esti-

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A Full Year's Information For Under $20!Hayden's new TV TECH/MATICS gives you a fullyear's TV schematics and servicing data for only$19.90! Compare that with the well over $100you are paying now for comparable information.Just your first two years of TV TECH/MATICSwill save you an incredible $200 or more!

No doubt about it, this is the ideal information"package" for the active TV Technician. It pro-vides complete schematics and vital servicingdata for a full year's models of every TV receiverproduced by the leading American manufactur-ers. All the diagrams and data are based on theoriginal manufacturers specifications-compiledand organized by the expert editorial staff ofElectronic Technician magazine. They are per-manently bound into volumes opening flat to291/2" x 11", ready to travel with you into thehome or give you instant information at thebench.

First of all, you get a clearly detailed and anno-tated circuit diagram of the specific model. Youalso get the following: a replacement parts list,alignment instructions, tube and critical partslocations, and important waveforms and voltage

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In addition, TV TECH/MATICS '65, the first inthe annual series, inclJdes, at no extra cost,complete servicing data and schematics for allcolor sets 1960-1965! TV TECH/MATICS '66will be out this month. TV TECH/MATICS '67 isdue early next year. So, save time, cut costs! Kickthe "separate schematics habit" for good!

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NOVEMBER, 1966 95

mate is deducted from the bill whenwe do the repairing, the owner canseldom find a price that beats ours.

"In any case, this program pro-tects the owners and protects theshop. The owner knows exactlywhat he's paying for and why, hecan get all the other estimates hewants, using the information we'vewritten on the back of the shopticket. At the same time, the $3.50charge at least covers our cost ofmaking the estimate.

"We've built a lot of customerconfidence as a result of this pro -

Save Time

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The ENDECO Desoldering IronRemoves Soldered Componentsin seconds ... without damage!Endeco melts solder, then removes it byvacuum Leaves terminals and mountingholes clean Resolders too One -handoperation Temperature controlled for con-tinuous use Ideal for use with shrinkabletubing 4 tip sizes Quickly pays for itselfin time saved Only $18.75 net.SMALLER SIZE AVAILABLE. SEE YOUR DISTRIBUTOR OR WRITE:

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cedure. There is no mystery aboutwhat we're charging for and why.This is fundamental to the con-tinued growth of our service busi-ness, we believe."

Low Carrying Charges

A sales feature that helps Wen-ger's expand its market is the com-pany's self-financing system.

"Our customers are 'fussy' oncredit," Bob Wenger says, "but alow interest rate is a big talkingpoint when it comes to selling, par-ticularly to the shopper whose B/Wset is still good but who wantscolor. Combined with the customizedtrade-in program made possible bythe firm's ability to move out thetrade-ins, our company credit pro-gram becomes a powerful lever forthe sale."

Wenger's charges one-half of onepercent flat on the unpaid balance,carrying the paper for the firstninety days without charge.

"It's often argued by dealers thatthe general public doesn't care whatthe total cost is. All they want toknow is what are the monthly pay-ments," Bob Wenger says. "We'refinding this situation is changingrapidly-perhaps because there hasbeen so much publicity, includingsome Congressional investigations,about credit charges.

"We thoroughly explain ourcharges and the fact that we carryour own paper. Most people aresharp enough to figure out thedifference.

"Older folks, particularly, arevery conscious about interest. Wealways suggest to the shopper whowants to look elsewhere before buy-ing that he ask `What's your interestcharge? We're getting many return-ees as a result of this sales tool andare closing the sales."

Following up all sales with lotsof personal attention, putting theemphasis on the shop's service andon management's concern that thebuyer get maximum satisfactionfrom his set, is a merchandisingpackage that brings results forWenger's.

This package, the senior Wengerconcludes, is the same today as itwas yesterday and will undoubtedlybe the same tomorrow because it'sthe package that produces satisfiedcustomers and satisfactory profitsfor the independent dealer.IN

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Compare Collook at the rest . . . newand you'll buy the best,

The all solid-state B&K Model 1245 Color Generatorduplicates the waveforms transmitted by a color TVstation.

Adherence to these waveforms makes it easy to con-verge the color tube, check sync and make other rasteradjustments . . . and the color generator with stationquality signal will be able to sync next year's sets.Generators with compromise waveforms do not give youthis obsolescence protection.

Here are oscilloscope photographs from the outputsof two typical competitive color generators, one tran-sistorized and one tube type, and the B&K Model 1245.The detailed analysis with each photograph shows a fewof the reasons why you'll save time and effort with B&K.

COLOR CROSSHATCH

STANDARD STATION SIGNAL

One horizontal sync pulse with Two lines showing horizontal syncits color burst. pulse with black and white tv signal,

TRANSISTORIZED B&K MODEL 1245

Good duplication of station signalincluding back porch. If the set won'tsync, the set is defective.

Well defined back porch or hori-zontal sync pulse permits accuratelysetting color killer and almost elimi-nates need to adjust brightness andcontrast.

TRANSISTORIZED GENERATOR A

No back porch causes unstablecolor sync. Burst amplitude compres-sion may permit sync on wrong colorbar.

orealalaliwilawaw

Square wave horizontal sync pulsewith no back porch and poor dc cou-pling forces adjustments of brightness,contrast & fine tuning to obtain usablepattern.

GENERATOR B

Vit'4......#

No back porch; color informationon top of sync -pulse makes sync diffi-cult on some sets.

Complete absence of ary backporch necessitates readjustment ofbrightness, contrast and fine tuning toobtain a usable pattern.

See your B&K Distributor for a demonstrationor write for Catalog AP22.

For the first time, with the no -compromise wave-forms from the B&K Model 1245, it is possible toaccurately set the color killer threshold control witha color generator.

The miniature size and convenience of the Model1245 match its performance. It provides crystal -controlled keyed rainbow color bar display, anddot, crosshatch, horizontal line and vertical linepatterns as well as gun killer controls that willwork with any picture tube. Size only 2j x 8x 8W. Net $13495.

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NOVEMBER, 1966

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NEWS OF THE INDUSTRY

New Hampshire's EducationalTV Network

A web of microwave paths fanning out from theUniversity of New Hampshire will soon bring educationalTV programs to all residents of the State.

Raytheon Co. has been awarded a contract to linkSaddleback Mountain in the state's southeast corner,with Walpole in the southwest, Hanover in the west cen-tral area and Littleton in the north.

This equipment will make it possible for educationaland cultural programs of the nationwide educational tvnetwork, or those originating at Durham, to be carriedacross the state where three new UHF transmitters canbroadcast them simultaneously.

From Saddleback, near the TV station, pictures andsound will be beamed 35 miles to Mt. Kearsarge. Therethey will be split three ways for simultaneous relay toWalpole (35 miles), Hanover (30 miles) and to CannonMountain and Littleton (65 miles). A spur from Saddle-

NEW HAMPSHIREEDUCATIONAL TV (

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back to the university studios at Durham will enable pro-gramers to monitor educational network programs comingfrom Boston, record them on tape and broadcast them atanother time. Network programs are now received onlyat the transmitter on Saddleback Mountain where thereare no recording facilities. Consequently, these programsmust be broadcast "live" or be lost.

The system will employ two transmitters, four receiv-ers, and two transmitter/receivers. The latter will be in-stalled atop Mt. Kearsarge and Cannon Mountain torelay the combined picture and sound to the three satel-lite transmitters, designed for unmanned operation.

Cost of the project is being shared equally betweenthe state and federal governments through grants fromthe Dept. of Health, Education and Welfare.

... for more details circle 134 on postcard98


MALLORY Tips for Technicians

Tipson replacing circuit breakersThat little red "breaker reset" button that sticks out of theback of nearly every television chassis can be a time-saveror a trouble -maker, depending on what's wrong inside the set,and who's pushing the button. As you well know, when a tran-sient fault has popped the breaker, you can get the set back inbusiness just by pressing the reset. But if there has been a short-circuit failure and some uninformed tinkerer presses the buttonand keeps it pressed, there's a good chance that more power keepsflowing into the fault. Result: a minor trouble becomes a calamity.

This is why Underwriters' Laboratories require that breakersshould be "cheat-proof'-that is, they should not allow currentto pass when the reset button is held depressed. Some of thereplacement breakers you'll find on the market aren't cheat -proof. We have one that is. It has features that you'll find valua-ble any time you need to install a new breaker, or when you'reworking on a breadboard circuit that needs over -current pro-tection.

Take a look at how this breaker works, and you'll see what wemean.

At top (Picture 1) is the way the breaker mechanism looks whenit's in the "on" position.

Along comes an overload (Picture 2). The bi-metal strip heats,snaps into the "break" position, opening the current carryingcontacts.

Now you press the button to reset (Picture 3). As long as youhold the button down, the contacts at the right remain open.Release the button and the contacts go back to closed (Picture4). If the overload is still there, the breaker will open again.You can't keep it closed on a short circuit!

No wonder this particular breaker is used as original equipmenton the majority of all television sets. They're made for Malloryby Mel -Rain Corp. to the same specifications as for originalequipment, and they're available from a Mallory distributornear you. Off -the -shelf ratings go all the way from 0.5 to 7amperes break current, and include all the values you'll needfor service replacement or for industrial equipment maintenance.And as an extra convenience, you can get them with either atwist -tab or bushing mount. For your copy of our new 24 -pagecross-reference guide to circuit breaker replacement in all popu-lar TV sets, see your Mallory distributor,or write to Mallory Distributor ProductsCompany, a division of P. R. Mallory &Co. Inc., P. 0. Box 1558, Indianapolis, - 4> .;..Indiana 46206. ANNIVERSARY

NOVEMBER 1966


99

HEATHKITlab Power Supplies

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Solid -State 0.5 to 50 Volt /RegulatedDC Power SupplyThe IP-20 features a solid-state circuitthat delivers up to 1.5 amperes with betterthan ±15 millivolts load regulation andless than 150 microvolts ripple and noise.It boasts an adjustable current limiter toprotect your equipment (50 ma to 1.5amps. in 5 ranges). Regulation & limitingtransient response is better than 25 micro-seconds. 0.1 ohms impedance. Here is atremendous value in a DC supply.Kit IP-20, 13 lbs $72.95Wired IPW-20, 16 lbs. $114.95

0 to 25 Volts at 200 ma.A handy power source for a multitude ofuses ... excellent for low -power transistorcircuits. Output resistance is less than 50ohms. Ripple less than 0.1%. Includes 3 -wire line cord.Wired E UW-17, 3 lbs $20.00

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0 to 6 And 0 to 12 Volts DC0, 5 amps.... A 6 Or 12 VoltBattery EliminatorFeatures switch selection of 6or 12 volt power. Separate me-tering of current and voltage.High -power unfiltered DC out-put for battery charge or indus-trial use -6 volts @, 10 amperesand 12 volts 6, 5 amperes.Kit IP-12, 18 lbs $47.50

FREE! World's LargestElectronic Kit CatalogIncludes these and over 250 other itemsfor the service technician, engineer, ham,teacher, and hobbyist.

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NEWS OF THE INDUSTRY

Color TV Still BoomingColor TV and FM radios were distributor sales prod-

uct leaders for July 1966 despite erratic vacation plantshutdowns. Although total TV sales declined about 9 per-cent in July, year-to-date sales were ahead by 18.5 percent.

B/W TV sales in July decreased 18.7 percent fromthe total for July 1965, while Color TV sales increased31.3 percent, increasing the January -to -July period totalsales to a figure 99.1 percent above that for the compar-able 1965 period.

FM sales in July increased 11.4 percent over July1965, giving the sets sold in the first seven months of1966 a 42.0 percent edge over the comparable period of1965.

The year-to-date figures on January -to -July unit salesare as follows:

1965 1966B/W TV Sets 4,045,842 3,935,766Color TV Sets 1,061,649 2,114,250Home Table, Clock andPortable Radios 6,272,819 6,919,688Home FM Radios 1,333,916 1,893,564Auto Radios 5,755,569 5,023,063Portable & Table Phonographs 1,513,957 1,420,044Console Phonographs 739,643 905,453

Three -Day MasterTV Antenna Seminar

Architects, engineers, technicians, educators and salespersonnel from six Middle Atlantic and Southern statesgathered in Atlanta, Ga., to participate in a three-day TVmaster antenna seminar conducted by Blonder -TongueLaboratories, Newark, N.J.

Under the direction of Nick Young, the electronicsfirm's national training program director, representativesfrom more than a dozen companies, as well as from theGeorgia State Dept. of Education and the GeorgiaState Educational TV Network, discussed a variety ofsubjects relating to MATV and educational TV equipment,installation and servicing techniques.

Topics discussed during the seminar sessions includedTV -fundamentals, TV -signal origination and distributionsystems for MATV and ETV.

"These training sessions," according to Mr. Young,"are designed to provide an outline of the basic require-ments of MATV and ETV systems, and the reasons forselecting certain electronic components and equipment in-stead of others."

Station WWV RelocatedEffective midnight Nov. 30th, all of the services

presently provided by the National Bureau of Standardsbroadcast station WWV, Greenbelt, Md., will be con-tinued by WWV, Fort Collins, Colo. Unavoidable delaysin equipment procurement and building construction de-layed the original target date of July 1, 1966.

All six carrier frequencies - 2.5, 5, 10, 15, 20, and25MHz - will be transmitted by omnidirectional verticalhalf -wave dipoles.


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This detailed compilation of practicalhelp is the answer to the need for anorganized gathering of proven troublesand cures, new and unusual circuits anddescriptions of how they work, field andfactory changes, recurring defects, etc.,that will help you locate and correctthe most elusive TV circuit faults. Thispractical information will help you solveyour daily servicing problems . . . willsave you hours of time and effort. Theseaccurate and clear servicing descriptionsare supplemented by over 125 easy -to -follow schematic diagrams and illustra-tions. For ease of use, all data has beenlogically organized by manufacturer andmodel number.

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Assembled for the first time in bookform, TV Troubleshooter's Handbook isthe one volume "Electronic Technician"readers have literally demanded as theanswer to simplifying their own work.This handsome, hardbound book is in-dicative of the many other fine offeringsmade to Members . . . important booksto read and keep . . . volumes with yourspecialized interests in mind.

How You Profit From Club Membership

This is just a sample of the help andgenerous savings the Club offers you.For here is a Club devoted exclusivelyto seeking out only those titles of interestto you as an electronic technician (nohobby or "fringe" books are offered).Membership in the Club offers you sev-eral advantages:


for a limited time only you can obtain this invaluable NEW

TV TROUBLESHOOTER'S HANDBOOKfor only 99C. a with Trial Membership in the Club

Literally scores of easy-touse schematic diagrams are contained in "TV Troubleshooter'sHandbook." (Example shown greatly reducedin size 1

1. Charter Bonus: TV Troubleshooter'sHandbook carries a retail price of $6.95.But it can be yours for only 99c withyour Trial Membership.2. Continuous Savings: The Club guar-antees to save you 15% to 75'k on thebooks you need.3. Editorial Advisory Services: TheClub's Editorial Advisory Board selectsonly the important books of direct inter-est to you.4. Wide Selection: Members are an-nually offered over 50 of the authorita-tive books on all phases of electronicservicing. The Club mai% es it a pointto offer new books, along with standardclassics . . . lists books from all pub-lishers - not just one or two.5. Prevents You From Missing NewBooks: The Club's FREE monthlyNews gives you advance notice of im-portant new books . . . books vital toyour continued professional advance-ment.

This extraordinary offer is intended toprove to you, through your own experi-ence, that these very real advantagescan be yours . . . that it is possible tokeep up with the professional literaturepublished in your specific area of inter-

- est . . . and to save substantially whileso doing.

How the Club Works

Forthcoming selections are describedin the FREE monthly Club News. Thus,you are among the first to know about,and to own if you desire, significantbooks. You choose only the main oralternate selection you want (or adviseif you wish no book at all) by means

CUT OUT ENTIRE POSTPAID ORDERFORM AT RIGHT - Fill in, paste, stapleor tape, and mail

of a handy form and return envelopeenclosed with the News. As part ofyour Trial Membership, you need pur-chase as few as four books during thecoming 12 months. You would prob-ably buy at least this many anyway . . .

without the substantial savings offeredthrough Club Membership.

Limited Time Offer!

Here, then, is an interesting oppor-tunity to enroll on a trial basis . . . toprove to yourself, in a short time, theadvantages of belonging to the only BookClub devoted exclusively to electronic

servicing. We urge you, if this uniqueoffer is appealing, to act promptly, forwe've reserved only a limited number ofHandbooks for new Members.

To start your Membership on theseattractive terms, simply fill out and mailthe postage -paid reply form today.You will receive TV Troubleshooter'sHandbook for 10 -day inspection. SENDNO MONEY! If you are not delightedwith the Handbook, return it within 10days and your Trial Membership will becance led without cost or obligation.Electronic Technician's Book Club,Drawer D, Thurmont, Md. 21788.

BUSINESS REPLY MA,LNo Postage Stomp Necessary If Mailed In The United States

Postage Will Be Paid By

ELECTRONIC TECHNICIAN'SBOOK CLUBDRAWER D

THURMONT, MARYLAND 21788

FIRSTCLASS

Permit No. 30Thurmont, Md.

DO NOT CUT HERE A JUST FOLD OVER. SEAL AND MAIL-NO STAMP OR ENVELOPE NECESSARY

Send No Money! Simply fill in and mail Trial Membership Coupon Today!

Please open my Trial Membership in the Electronic Technician's BookClub and send me a copy of your 192 -page TV Troubleshooter's Hand-book, billing me for only 990 plus a few cents postage and mailingexpense. If not delighted, I may return the book within 10 days and owenothing. Otherwise, to complete my Trial Membership, I agree to pur-chase at least 4 additional monthly selections or alternates during thenext 12 months. I have the rip;tt to cancel my membership anytimeafter purchasing these four books.

Name Phone No.

address(NOTE: check if home or business address

City State Zip

Company Title 116(The Club assumes peerage an all prepaN orders. Feriae. and Canadian prises 10% higher.)

THIS ENTIRE FOLD -OVER COUPON FORMS A NO-POSTAGE-REOUIRED BUSINESS REPLY ENVELOPE

NOVEMBER 1966

. .. for more details circle 154 on postcard103

WORLD'SFINEST

MULTICOREI

ONLY 69cBUY IT AT RADIO -TV PARTS STORES

MULTICORE SALES CORP. VVESTBURY, N.Y. 11591


Fill in coupon for a FREE One Year Sub-scription to OLSON ELECTRONICS' Fantas-tic Value Packed Catalog - Unheard ofLOW, LOW PRICES on Brand NameSpeakers, Changers, Tubes, Tools, StereoAmps, Tuners, CB, Hi-Fi's, and thousandsof other Electronic Values. Credit planavailable.

NAME

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CITY STATE ZIP-If you have a friend interested in electronicssend his name and address for a FREE sub-scription also.

OLSON ELECTRONICS, INC.

535 S. Forge Street Akron, Ohio 44308

. for more details circle 135 on postcard104

ADVERTISERS INDEX

Alliance Mfg. Co. 101

Allied Radio Corp. 93

Amphenol Distributor Div. 87

Arrow Fastener Co. 104

B & K Mfg. Div. 81, 97

Blonder -Tongue Laboratories, Inc. 22

Borden Chemical, Krylon Div. 24

C & K Components, Inc. 92

Castle TV Tuner Service 34

Channel Master Corp. 31, 32, 33

Cleveland Institute of Electronics 85

Columbia Wire Products Co. 24

Cornell-Dubilier

Delco Radio Div. 89

E. C. I. Electronics Commun'cations, Inc 77

EICO Electronic Instrument Co. 75

Electro-Voice . 39

ELECTRONIC TECHNICIAN Book Club 102 103

Enterprise Development Corp. 96

Finney Co. 79

Gavin Instruments, Inc. 86

General Electric Co. 36 37

Hayden Book Co. 95

Heath Co. 100

Hickok Electrical Instrument Co. 3.5

Jensen Mfg. Co. 19

Jerrold Electronics Corp. 2nd Cover, 90

JFD Electronic Corp. 2627

Kay -Townes Antenna Co. 96

Lechtrotech, Inc. 38

Mallory Distributor Products Co. 99

Multicore Sales Corp. 104

National Radio Institute 93

Olson Electronics, Inc. 104

Oxford Transducer Co. 76

Pearce -Simpson, Inc. 28

PermaPower Co. 78

Philco Corp. 23

Radio Corp. of AmericaRCA Electronic Components

& Devices 4th Cover, 20, 8-3RCA Institutes, Inc. 30RCA Sales Corp. 40

S & A Electronics 88

Sarkes Tarzian Tuner Service Div. 29

Seco Electronics Corp. 64

Sencore, Inc. 63, 65, 67, 68, 69

Sprague Products Co. 25

Sturtevant Co. 96

Sylvania Electric Products, Inc. 73, 91

Viking Electronics 104

Xcelite, Inc. 82

Zenith Sales Corp. 74, 80, 94

new from Viking

11 FEED -THROUGH

LIGHTNING

ARRESTOR

Model #5904 - just $3.00Now install practical, efficient

protection against lightning damageto your CATV system. Viking Model;5904 protects against power surgescaused by electrical fields in theatmosphere, lightning hits, short cir-cuits, and direct contact with powerlines. Features discharge gap sealedin with rare gas atmosphere. Com-pactly packaged, (P2" h x 2" wx 7;8" d), the die-cast zinc housingis Vik-O-Processed against damageby the elements. More information?Write or call (collect of course):

viking830 Monroe St., Hoboken, N. J. 07030

(201) 656-2020 (212) 943-5793... for more details circle 149 on postcard

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n UP TO3/16"

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Hi-Fi, Radio & TV wiresTapered striking edgegets into close corners!

Available in:Brown, Ivory, Beige,Monel, Bronze, Natural

1 JUNIUS STREET BROOKLYN 12. N. Y. -



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The Magnificent 1

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Here's your inventory of over 100 exact replacements!It's a fact: This CDE twist -prong capacitor assortment will satisfy almost all yourreplacement requirements. Instead of carrying i 00or more cap_citors, now youcarry just 12! And with the addition of a BR, your flexibility is increased to over200 capacitors!

Are these "exact" replacements? As exact as they can be! Don't be fooled by the"numbers game." The E,A has published capacitor rating ye:Lies that arestandard for the industry. Hiding behind the labels of over 1,800 of ourcomoetitor's "exact" replacements are only a few hundred different capacitors!The convenient CDE kit. The Magnificent 12 represent your money -savingminimum working inven ory. Backing them up is the rest of CDE's twist -prongline... a line developed after five years of research. Your CDE distributorguarantees instant availability on all of them. That's right: you get over-the-counter service on all 200 wide application range twist-prongs... as opposedto ordering from over 1,800 "exact" replacements.

Investigate the practicality and convenience of CDE twist -prong capacitors today!Free! Ask your distributor for CDE's 96 -page Twist -Prong Electrolytic Reference,plus details on the 100+ reola:ements this kit covers.

=CORNELL-DUBIL1ER

fo rmore de'ails circle 116 on postcard

Are you offering today's color?

HRITEAUWFWMOR

' I PICTURE TUBENFt/2IFB P 22A

RCA Hi-Lite color picture tubesbring OEM quality to

your replacement tube customersOdds are that when you're called to replace a customer's color picture tube and youreplace it with an RCA Hi-Lite, you're giving him a better product than he had when

his set was new.That's because RCA Hi-Lite picture tubes are RCA's best ... the same quality... the

same tubes ... that go into today's original equipment sets. RCA Hi-Lites are all -new ...

glass, gun, the works! And incorporate the continued advancements in picture tube tech-nology achieved by the world's leading color picture tube manufacturer. So you literally"up -date" your customer's color set when you install one.

Here's picture brightness and color fidelity at its fines, mailable for the service trade

in 19 -inch and 25 -inch rectangular and 21 -inch round tube types.

How about you? Are you offering your customers today's color?RCA Elictronic Components and Devices, Harrison, N.J.


world's largest electronic trade...itrr ..rma ['wren/v*111i +c r, or this *1111 ++....

Documents

world's largest electronic trade...itrr ..rma ['wren/v111i +c r, or this 1111 ++....