nen radio opportunities - radio lelephon, nen llit!h speed ... · who can use the figures to guide...

inThisissue:

Nen Radio Opportunities - Radio lelephon,

Nen llit!h Speed Circuit TesterJul;., 1911

MALLORY

Tips onRadio Service

Short Cuts

ReclaimingHigh LeakageElectrolyticCAPACITORS

Where high leakage wet or dry electrolytic capacitors are encoun-tered, many of them may be re -aged and put back into service.

The simple method described below requires little equipment andwill prove useful in reclaiming such units where possible.

Necessary Equipment-a rectifier power supply capable of delivering upto 500 volts DC at 100 milliamperes.

2- any convenient means for varying the outputvoltage of the power supply to match the ratedvoltage of the condenser to be re -aged.

3 - a 10,000 ohm 10 watt resistor.

4 - a 0 to 500 voltmeter.

5 - a 0 to 50 milliammeter.

P. R. MALLORY & CO., Inc.INDIANAPOLIS 6 INDIANA

MYE TECHNICAL MANUAL-408 pages of complete data oncapacitors, noise suppression, re-ceiving tubes, loud speakers,vibrators, phono-radios, auto-matic tuning and other 'valuableinformation. Available from yourMallory distributor-Pric,e,$2.00.

4TH EDITION RADIO SER-VICE ENCYCLOPEDIA . . .Complete information on repair-ing any make or model of re-reit. er. Circuit references, originalpart numbers and recommendedreplacements. Available fromyour Mallory distributor...Price, 95 cents.

CAPACITORUNDER

TEST

CIRCUIT

-r-

10000 OHMS(10 WATT)

VOME

0-5

LT

TER00V

MILLIAMMETER0-50 MILLIAMPERES

OPERATION

TO POWERSUPPLY (WITH

VARIABLEOUTPUT VOLTAGE)

1 Adjust power supply to read DC operating voltage-a- of condenser plus 10 volts.

2Remove capacitor after milliammeter has read 2milliamperes or less for 15 minutes.

P. R. MALLORY EL CO Inc

Approved Precision Products

History of Communications Number Five of a Series

NIGHT COMMUNICATIONS ON THE HIGH SEAS

In those early days when our Navy was first organized night communica-tion was made by lantern from the masthead. This was the only com-munication between ships at sea during through which many times newsfrom home was transmitted.

Today, through the use of Universal Microphones and voice communica-tion components, vital communications of War are speedily transmittedequally as well from small sea -craft and battle cruiser to home port.

Many new types of Universal microphones shall be developed from theexperience obtained from the production of military units, for the privatecitizens in the marine pleasure -craft in the days after Victory is ours.

< Model T -30-S, illustrated at left, is but oneof several military type microphones now avail-able to priority users through local radio jobbers.

UNIVERSAL MICROPHONE COMPANYINGLEWOOD, CALIIFORNIA

FOREIGN DIVISION: 301 CLAY STREET, SAN FRANCISCO 11, CALIFORNIA CANADIAN DIVISION: S60 KING STREET WEST, TORONTO 1, ONTARIO, CANADA

July, .1944 1

The Army -Navy Production Awardfor outstan g achievement in producing vitally im-portant mate Is essential to the war effort will be anadded incentive kto the management and employees of

WARD PRODUCTS CORPORATION to keep producing moreand better equipment for the men who are doing thefighting. While yesterday WARD Antennas were acces-sories for pleasure, today they are implements of War.

dtrettani.THE WARD PRODUCTS CORPORATION, 1323 EAST 45TH STREET, CLEVELAND, OHIO

Radio Service Dealer

UNIMETER

Completely portable all-aroundutility instrument, ideally suited forreliable service work. Large meter cali-brated to reduce the error possibilityin readings makes the G -E unimeter apopular one with servicemen.

Other General Electric units avail-able for testing electronic circuits andcomponent parts are: audio oscillators,oscilloscopes, condenser resistancebridges, signal generators and otherutility test instruments.

For complete details about the newGeneral Electric line of SERVICE TEST-ING EQUIPMENT, please fill out thecoupon below...

FREECATALOG

ELECTRONICSDEPARTMENTGENERAL ELECTRIC CO.Schenectady, N. Y.

Please send, without obligation tome, the General Electric Testing In-strument Catalog, D.? (loose-leaf), formy information and files.NameCompanyAddress

GENERAL 3 ELECTRICElectronic Measuring Instruments

radio service dealerCovering all phases of radio, phonograph, sound andelectrical appliance merchandising and servicing.

VOLUME 5, NUMBER 7JULY - 1944CONTENTS

With the Editor 4Astounding Radio -Appliance Potential; Gas for Servicers

In & Around the Trade 6What goes on in the market

Time Means Profits Eugene A. Conklin 11There's money in clock repairs and service

A New High Speed Circuit Tester A. Liebscher 12A "must" article for bench and lab. men

Know Your Oscillograph! (Part 2) 13A complete discussion of the how and why of this instrument

Outlook for Radio and Appliance ServiceDealers R H. Rasmussen 16The low-down on the real selling job ahead

Technical Service Portfolio Section XL 20Paper Capacitors as Mica Capacitor Substitutes

DISCussion 22Latest news on records and record makers

Our Cover: New Opportunities in Radio 23Uses of radio -in -industry

Letters to the Editor 24The customers always write

ELECTRICAL APPLIANCE RETAILING SECTIONNews 19

SANFORD R. COWAN....Editor & Publisher LEWIS C. STONE Managing Editor

CHARLES H. FARRELL .Advertising Manager SYLVIA BORNKOFF Circulation

Copyright, 1944COWAN PUBLISHING CORP.

Executive & Editorial Offices: 342 Madison Ave., New York 17, New YorkMember of the Audit Bureau of Circulations.

RADIO SERVICE DEALER is published monthly at 34 NorthCrystal Street, East Stroudsburg, Pennsylvania, by the CowanPublishing Corp., Executive & Editorial Offices: 342 Madison Ave-nue, New York City 17, New York. Subscription rates:-UnitedStates and Possessions $2.00 for 1 year, $3.00 for 2 years; elsewhere$3.00 per year. Single copies: 25c. Printed in U. S. A. Enteredas Second Class Matter October 3, 1941 at the Post Office at EastStroudsburg, Pa., under the Act of March 3, 1879. All subscribersshould allow at least three weeks for change of address. Every-thing concerning subscriptions should be directed to CirculationDept., 342 Madison Ave., New York 17, N. Y. Material submittedmust contain a self-addressed stamped return envelope. Whileevery effort will be made to handle articles with care, the publisherassumes no responsibility. Material accepted is subject to anyrevisions, including change to, or omission in "by-line" as well asauthor's name, which in the opinion of the publisher may be deemednecessary or expedient. Payment will include all photographs,sketches, diagrams as well as all of the author's right, title andinterest in and to the material submitted. Material submitted willbe considered to have been released by the person or persons shownor mentioned therein, and the authors agree to hold this publisherharmless from any manner of suit or damage resulting from theprinting of said pictures or articles.

July, .1944 3

with the editor OOOOO

Astounding Radio -Appliance Potential

THE MILWAUKEE JOUR-NAL's 1944 survey of condi-

ditions obtaining in that typical,thriving American community areworth noting by Service Dealerswho can use the figures to guidethem in their present and postwarplanning.

Milwaukee has 226,000 homes,urban and surburban combined. AService Dealer knowing his com-munity's size can use proportionalratios to determine his own par-ticular sales and service potential.To illustrate, if 10% or 22,600 Mil-waukee families want fishingtackle, it is safe to assume that ina town of 2,000 population, 10%or 200 families will also wanttackle. Let Milwaukee guide you.

Quoting from the survey: 27.5%(or 62,168) Milwaukee homes haveradios needing repair or replace-ment ; 19.5% (or 44,000) homeshave vacuum cleaners needing re-

pair or replacement ; and the fig-ures for other applicances are:washing machines, 40,000 homes ;cooking ranges, 21,250 homes ;electric irons and toasters, eachabout 20,000 homes; refrigerators,18,000 homes and electric mixers,10,400 homes.

As 31.7% (71,600) Milwaukeehomes want a quick-freeze unit;44.2% want automatic washers and35% want electric ironers, it is ap-parent that prospects for this coun-try's radio and electrical applianceservice dealers are exceedinglybright. It's a great, profitable busi-to be in. So, repair to the hilt now,keep customers happy by treatingthem fairly, put profits into WarBonds and be prepared for thefast -approaching V -Day and thetime when radios and applianceswill again be delivered to dealersand consumers eagerly awaitingthem.

"B" Gas Rations For Servicers Now Okeh!

ON JUNE 19th the OPA amendedand "clarified" gasoline Ration Or-der 5C with the statement, "Pre-ferred mileage may not be grantedfor the repair of radio receivingsets unless the sets are used by oron behalf of a government or gov-ernment agency for inter -com-munication or f o r monitoringbroadcasts."

At first reading of this ROamendment we got the impressionthat Service Dealers were nowonly to b allowed "A" gasolinerations. We communicated withMr. Quentin W. Regestein, OPAWashington, D. C., who statedthat such an interpretation was in-correct. Mr. Regestein further ex-plained that "preferred mileage"means "C" rations, for which onlya few Service Dealers will qualify.However, the OPA authority de-clared that Service Dealers mayapply for and obtain "B" rationsunder the new amendment as it isrecognized by OPA that the main -

4

tenance and repair of home radiosets is a valuable adjunct to thewar effort.

Service Dealers in the Easternpart of the country are now eligi-ble for sufficient "B" coupons toallow them 325 miles of occupa-tional driving per month. ServiceDealers in the Midwest section areentitled to 475 miles of occupa-tional driving monthly and ServiceDealers located out West mayhave 400 miles of occupationaldriving monthly.

Many Ration Boards, confusedby the original Ration Order, havelong refused Radio Service Dealerssupplemental "B" rations on thegrounds that repairing homeradios meant repairing "entertain-ment devices" which of course wasnot the original intent of OPA.Now, at long last, the entire issueis clarified. Service Dealers, as wehave maintained from the outset

(Continued on page 32)


//74.00,1"`

le1011M I Thanks to the Preferred -Type

Program of the Army and Navy

WHEN the radioman in a critical battle today needsreplacement tubes, he knows they're ready to move

up to him . . . on the double!

But this fortunate situation doesn't just "happen";actually, it is the result of careful planning.

Months before Pearl Harbor, the Joint Army -NavyCommittee on Vacuum Tubes recognized the desirabilityof keeping the number of tube types in military equip-ment at a minimum. A Joint Army /Navy PREFERREDLIST OF TUBES was adopted, and military equipment wasdesigned around these tubes almost exclusively. Thisforward -looking policy greatly simplified military tubestocks, thus insuring speedy replacements whereverthey're needed.

The Preferred Type idea works.

Today, it is saving lives . . . tomorrow it will bringyou greater profits. You'll have faster turnover if thebulk of your tube business is in fewer types. Your order-ing will be simpler, deliveries faster. You'll save book-keeping costs, and your customers will be sure of better

tube performance . . . for quality is more uniform as aresult of longer manufacturing runs on fewer types.

You can count on RCA to keep plugging the PreferredType Program. It makes sense . . . for the Armed Forcestoday, for your business tomorrow.

And speaking of tomorrow, remember, the MagicBrain of all electronic equipment is a Tube . . . and thefountain -head of modern tube development is RCA!

Tune in on RCA's "The MusicAmerica Loves Best" everySaturday, 7:30 P. M., E. W. T.,Blue Network.

BUY

WAR

BONDS

RCA VICTOR DIVISION CAMDEN, N. J.

LEADS THE WAY.. In Radio . .Tubes..Phonographs . . Records . . Electronics

62-5131411

July, 1944 5

alma ihe TradeBeing a condensed digest of some of the happenings inand around the radio trade as compiled by the Editors

Paul V. Galvin (left), president of the Galvin Manufacturing Company, Chicago,hands the gavel over to Raymond C. Cosgrove, vice president and general man-ager of the manufacturing division, The Crosley Corporation of Cincinnati.Mr. Cosgrove was elected president of the Radio Manufacturers Association at

its Third War Production Conference in Chicago last June.

New Philco Television LinkJohn Ballantyne, president of the

Philco Corporation, Philadelphia, pre-dicts that over the years televisionshould duplicate the remarkable recordof growth and progress of radio

In line with its plans to participatein and contribute to this growth, thecompany has just opened a New Yorkto Philadelphia television relay trans-mitter link.

Asiatic Appoints CartwrightR. T. Shottenberg, Sales Manager, an-

nounces the appointment of J. M. Cart-wright, 1276 Peabody Avenue, Memphis,Tenn., as representative of The AstaticCorporation, Youngstown, Ohio, in the

States of Louisiana, Mississippi, Arkansasand Western Tennessee. Mr. Cartwright,long familiar with radio and sound prod-ucts, will serve Astatic's established cus-tomers to good advantage in this territorywhere he is so well and favorably known.

Radio Training Films Available"Crystals Go To War," a training film

of Reeves Sound Laboratories, Inc., ofNew York City, is the Kodaehromesound film which illustrates and nar-rates the manner in which vital crystaloscillators, supplied for Airborne Radio,United. States Army Signals Corps, aremade.

It starts with an introduction aboutthe various types of quartz and theiroriginal uses as ornaments, decorativepieces and in jewelry, and then goes

on with a brief history of the discoveryof the piezoelectric property of thequartz crystal and its development byDr. Cady, of Wesleyan University. Itthen continues on with the perfection ofthe rough quartz for manufacture: thecutting, sawing, lapping and testing ofcrystal oscillators.

The film is available on applicationby technical organizations.

The film may be obtained by schools,colleges or civic groups upon paymentonly of transportation charges. Re-tional Department of RCA Victor Di -quests may be addressed to the Educa-vision, Camden, N. J.

Crosley Appoints Distributorfor Portland, Ore.

Appointment of the Arthur L. FieldsChevrolet Company of Portland, Oregon,as distributor for The Crosley Corporationin the Portland, Oregon, territory, was an-nounced by J. H. Rasmussen, commercialmanager of The Croslev Corporation.

Arthur M. Fields

For the past twenty-seven years, ArthurL. Fields has been at the head of thiscompany which has been operated as apartnership. The company occupies a mod-ern two-story concrete building at 107S.E. Grand Avenue in Portland, where allpossible facilities in both service and partswill be available to Crosley dealers.

Plant -Broadcasting UnitA simplified low-cost unit for voice -

paging and music broadcasting in warproduction plants was announced lastmonth by Operadio Mfg. Co., St.Charles, Ill.

This "Plant Broadcaster" operates 20to 40 loudspeakers and covers an areaof up to 100,000 sq. ft. The attractiveeabinet requires only 22 ins. of floorspace and comes ready to "plug in."

The new standardized broadcastingunit is highly versatile. In addition tobroadcasting music to maintain or in-crease production with fewer workersor untrained personnel, it can be used


6 Radio Service Dealer

lkilacktwfrAvisricereve

0/704iiPthlooMeleWhen "Delivery Day" comes many of your service customers will want-

and will buy from someone - that extra radio they've been planning on,

or a smart new portable phonograph. Because you will have their confi-

dence and will be welcome in their homes-these will be sales dates that

YOU should make and keep, with profits that YOU should pocket. Don't

lose this opportunity. Send for your MECK "Rosy Future" Date Book

today (it's FREE!) - and start making a complete list of your future sales

customers NOW. Then - when "delivery day" comes - you will be

prepared to meet those customers' needs with MECK Radios and Phono-

graphs. Remember, they're Built to Perform, Priced to Sell !

WRITE FOR 71ee"DATE BOOK" NOW

Pocket size, dur-able - get startedon YOUR post-warplans now. Justwrite-it's free!

BUY MORE BONDS-AND KEEP THEM!

DISTRIBUTED NATIONALLY THRU RADIO PARTS JOBBERS

Ery RADIOS :PHONOGRAPHS

INDUSTRIAL SOUND

JOHN MECK INDUSTRIES, PLYMOUTH, INDIANA, U. S. A.

July, 1944 7

No use tryitv,'to Step oil it

atiI the vOris over

augktihiffar-Titrie&wig

zy Jonking,

I know a lot of folkswho are

sittingthis war out.

Oh, theymay be

hustling some,

but they are giving their real

brains andwill-power a

three or

four-yearvacation.

No use, they figure,to hump

their cerebral musclesuntil peace

comes.I wouldn't

put any radio service

men in this class,but, just the

same, a popular national business

magazinetells of a radio dealer

in Brooklynwho hadn't

changed his

window display since Pearl Harbor.

An irate prospectfor a scarce

radio tube insistedthat the deal-

er take a tube out of one of

three setsin his window. Dealer

insistedthere were no sets in the

window, and nearly collapsedwhen

he saw 'em.Dealers who

don't getahead in

theirthinking now,

are going to

be behindwhen peace comes. Manu-

faxturers arepreparing new

prod-

ucts and there'sbound to be an

upsurge in competitiontoo. The

way for establishedservice men to

get theirshare of the clover is

to keepinformed on developments,

keep a live, neatshop, and culti-

vate future customers.

Smart dealersalways cash

in on

the real and prestigevalue of

using and talking about famous

radio parts,such as International

ResistanceUnits.

No. 6 in a series of specialmessages pre-

pared by America'sfamous business

writer,

humorist andcartoonist, Don Herold. . . . In

sponsoringthese Don Herold "broadcasts,"

I R C paystribute to the thousands of Radio

Service Men who, wheneverpossible, specify

and use IR C resistance units in their work.

STAN401 N. Broad St. . Philadelphia 8 Pa.

MC makes more types of rosisto re units, in more shapes, for more applications than any other manufacturer in the world.

giftt"."4

4 /ABLE 113

In & Around The Trade(Continued From page 6)

to provide plant -protection alarm andair-raid warning. It enables management to talk directly to employees andto furnish them with news broadcasts,nutritional and safety information,War Bond programs, inspirational ma-terial and the like.

The control cabinet can be 'locatednear the telephone switchboard, orplaced in any convenient location withconnection to the microphone and keycabinet at the switchboard. Pagingcalls may be sent over the system whilemusic is being played by means of anautomatic control which decreases themusic volume. This permits the pagingcall to be heard clearly and yet con-tinues the thread of the music melody.

A complete summary of research inthe industrial field has been issued inbooklet form, by Operadio, under thetitle of "Music and Manpower".

Stromberg-Carlson NoteStanley H. Manson, manager of pub-

lic relations for the Stromberg CarlsonCompany and Lee McCanne, the com-pany's secretary and assistant generalmanager, attended the annual confer -

Stanley H. Manson

ence of the National Federation ofSales Executives held recently in Chi-cago. Mr. McCanne was elected a di-rector of District II of the Federation,comprising the Sales Executives Club inNew York, Albany, and Rochester, N. 'Y., and Newark, N. J.

Dr. Power Reopens OfficesDr. Ralph L. Power, Los Angeles ra-

dio counsellor, has returned to his ownoffices after termination with the San

Francisco Signal Corps Inspection Zoneof the Army, which he joined in 1942.

After being in the AEF, World WarI, Dr. Power became a college profes-sor, and was one of the first radio an-nouncers on the West Coast and radio

Ralph L. Power

editor of the Los Angeles Times, Ex-aminer and Record. He then enteredadvertising.

His first client was the UniversalMicrophone Company, which accounthe still retains and he also handlestrade publicity for the Hoffman RadioCorporation, Los Angeles.

Donley Heads New WestinghouseRadio Receiver Division

Walter Evans, Vice President incharge of Westinghouse radio activities,announces the appointment of HaroldB. Donley as manager of the Westing-house Radio Receiver Division. Thismarks the first time since 1928 thatWestinghouse will develop a completeline of home radio receivers which willinclude standard receiving sets and fre-quency modulation, with and withoutphonograph combinations, and home tel-evision equipment. These will be man-ufactured and marketed as soon aspossible.

Mr. Donley has been with Westing-house 22 years and was until recentlygeneral appliance manager for theWestinghouse Electric Supply Companyin New York City.

RMA Elects S. I. ColeS. I. Cole, president, Aerovox Corp-

oration, New Bedford, Mass., has beenelected a director of the RMA PartsDivision for two years beginning 1944.

Aero Appoints BurchamDon Burcham has been appointed

representative in the northwest forAero Needle Company, Chicago, Ill.

Belmont Increases DeliveriesP. S. Billings, president, Belmont

Radio Corporation of Chicago an-nounces that deliveries of radar andother electronic equipment to thearmed forces for the first five monthsof this year came to more than $27,-000,000. This is greater than the com-pany's production for all of 1943.

Frank M. Folsom, RCA Victor Division head and other company officials, greetDave Schwab and Harry Spector, of the D & H Distributing Company, whichhas just added Baltimore to its territory for the distribution of RCA Victorproducts. Left to right are Mr. 7olsom, Dave Schwab, M. F. Blakeslee, RCAVictor's Eastern Regional Manager, Harry Spector and T. F. Joyce, GeneralManager of RCA Victor's Radio, Phonograph and Television Activities.

July, 1944 9

how to photograph salt eating its dinnerSalt, from the sea and air, 'has a tremen-dous appetite for many metals-eatingthem away unless they're protected. Theexact effect of its gluttony and the suc-cess of the means used in preventing thiscostly damage are measured accuratelyby Utah's salt -spray test. One of thestages in Utah's complete circuit of radioand electronic tests.

Immediately after the parts have beensubjected to the salt spray, microphoto-

graphs are taken and developed in theespecially equipped Utah dark room.Thus, it is possible to make a microscopicinspection of the actual condition of themetal before other atmospheric changestake effect. Since metal surfaces exposedto salt -spray tests change rapidly aftertests are completed, it is necessary andpossible, by this photographic method,to determine and accurately record cor-rosion in metals.

Radio Products Company,

836 Orleans Street, Chicago 10, Illinois

As a result of this and other Utahtests, efficient performance of Utah partsis assured under any and all conditionsnormally encountered-the failuresdue to inadequate, inaccurate testingare avoided. * * *Every Product Made for the Trade, byUtah, IE Tioroughly Tested and Approved

Keyed to "tomorrow's"ci,rnonds:Utah wirewound

controts,plugs,

jacks, vitreousenamel

r,:form-

ers vibratorsspeakers. esistors

ran

10 Radio Sertiee Dealer

0

TIME MEANS PROFITS

by Eugene A. Conklin

Clock servicing is a "natural" extra money-maker forradio servicemen during war -time. These repair cus-tomers will be post-war radio and appliance buyers.

amination, Bartlett calls the house-hold and issues a verbal reminder.If the clock isn't in on the specifiedday the customer does not get the50c rate but may pay the regularshop charge which is somewhathigher.

In this way Bartlett does not goout on a limb as regards getting toohuge a number of clocks in for themonthly once-over. For good meas-ure, customers desiring the servicemust make their own pickups-nohouse calls are even remotely con-sidered.

Bartlett uses one full day weeklyto check the clocks in theatres, res-taurants, small factories and busi-

ness offices. Again this "commercialcheckup" is at a flat monthly rate of75c, the slightly higher figure beingjustified by the leg work involved.

Bartlett does not attempt to trainapprentices in the art of clock -repair-ing but he has hired a house wifewho accepts and disburses bothradios and clocks over the shopcounter.

It's this serviceman's consideredopinion that the repairing of elec-tric clocks is desirable from allstandpoints. But he will not repairany other form of electrical product.Clocks is clocks, and toasters, iron-ers, cleaners and the like he cannotundertake to service.

Mime On My Hands is a perpetual1 Hit Parade candidate so far as

Radio Serviceman Bartlett, of Syra-cuse, New York, is concerned. Forto him an electric clock is a thingof beauty. Getting down to cases,Bartlett combines radio servicingwith electric clock repair. For atpresent the humble electric alarmclock is kingpin in the scheme ofgetting defense -workers to work ontime. And replacements are not al-ways available if the family time-piece goes on a spree.

Bartlett believes that electric clockservicing is a wartime field of en-deavor worth considering by thetypical radioman. There is no de-livery problem; clocks can be broughtinto the shop in person and pickedup by the customer in person. More-over, clocks present only half the re-placement situation that radios do.Clock parts are fairly plentiful ac-cording to this radio -clock repair-man.

Bartlett puts aside a certain sec-tion of each day for clock -servicing.He suggests it best to work for afew hours at the radio service benchthen spend an hour or two on clockrepair. The change in work relaxesthe radioman's mind and preventshim from going stale. Bartlett ad-vises that this procedure helps fromthe standpoint of customer satisfac-tion. All things being equal, they'llbear with and not criticize a service-man for delays in radio repairing ifthey respect him as a clock -repairerand depend upon him in his dualrapacity.

This enterprising Syracuse serv-iceman informs all radio customersabout his clock activities personallywhen they enter and again as theyexit from the shop. In addition, heuses time signals which tie in withhis clock -repairing business.

Bartlett recommends a monthly"inspection" of electric clocks at aflat inspection rate of 50c. For thisfee the clock is examined and minoradjustments made if necessary. Seri-ous repairs are charged fully forand are not included in the monthly"time -checking" fee.

In this way Bartlett can catch theflaws in electric clocks before theygenerate into serious propositions.Each customer has a certain dayeach month he or she is to bring allhousehold clocks into the shop. Inan average family some family mem-ber has a wristwatch so that thehouse isn't left timeless. The inspec-tion is completed in 24 hours flat un-less trouble really rears its ugly

-head.The clientele for this monthly

checking service is necessarily re-stricted to a selected group and onlyso many are accommodated monthly.It is not an "advertised" service andis confined largely to radio custom-ers. The day before a customer'sclock or clocks are due in for ex -

A view of Bartlett's Shop

A New

HIGH-SPEED CIRCUIT TESTER

HOW much time have you lostbecause you did not have aschematic diagram on hand to

indicate cable connections? Andhow many hours have you wasted be-cause the nomenclature of a tubewas effaced and you were not surewhich socket terminals had plate,filament or bias voltage? Has itbeen trouble to be certain of havingthe proper voltmeter range, polarityand choice of AC or DC indicationbefore you dared touch a probe toquestionable points in a circuit?And what about accidentally prob-ing a high voltage contact, when youdid not predetermine its presence,only to see your meter bang itselfoff scale once more?

Well, the Electronic Indicator de-scribed in the circuit in Fig. 1B isnot designed to be a cure-all, but itwill go a long way in relieving yournerves and conscience by makingcare -free random probing possible-and what's more, very practical.With it you can feel free to be quite"trigger happy" without endanger-ing the life of your meter or caus-ing damage to a bias cell.

Take any radio chassis or elec-.tronic control device, turn it upsidedown and start probing with this"magic" indicator. Yes, probe anypoint-plate, screen, bias, a.v.c.,power line output, oscillator grid,power transformer secondary and allthe rest-and your answers willcome rolling right along; positivedc, negative dc, AC, motor -boating,negative oscillator grid voltage,audio speech or music, etc.

Of course, there are limitations.The Indicator will not show actualvoltage, but it will differentiate be-tween high, medium and low de volt-age (so you can tell plate or screenfrom cathode and grid) ; in fact, youcan go a step further and identifythe ac filament contacts-all withoutturning a knob or even changing apin plug.

Here's how it works. First, the

by A. Liebscher

This electronic indicator has time -saving features,plus safety operating factors which prevent meterburnout . . . Random probers can be trigger-happy."

cathode bias resistor (Re) is set tocause the indicator 6E5 tube to illu-minate 2/3 of its normal unbiasedshadow angle, with no input signalor external voltage applied. (SeeFig. 2)

Then the plate resistor (Re) isadjusted to cause the two edges ofthe illuminated portion of the indi-cator to contact each other withoutoverlapping, with a 6.3 -volt,cycle signal applied to the input.

After these two easy calibrationshave been made the interpretationsof various reflections are used to dif-ferentiate between AC (a -f) or dc,relative dc voltage values; contin-uous audio or interrupted audio.

The application of a negative devoltage will close the eye within arange of approximately -4 to -1000

AMPHENOL or 2 -WAY PHONE PLUG

SHIELDED TEST LEAD

Figure 1A -1B

volts. Voltages down to a half voltor less will be indicated, althoughthey may not be sufficient actuallyto close the eye.

Positive voltage applications up to1000 volts will reverse the deflection,causing the eye to open. We see herethat a quick, safe and reliable indi-'eation of polarity is obtainable evendown to the smallest potential whichwill produce a visible indication.

Examining Figure 1, you will notethat the resistor (Re) and the capaci-tor (Ce), in series, will serve as ameans of assuming a charge from anapplied de voltage. This charge willslowly leak off due to the high resist-ance discharging circuit through the10 megohm input resistor (Re),which with Ite remains to dischargeCe once the source of the appliedvoltage is disconnected. This dis-charge rate for either positive ornegative voltage will be in propor-tion to the applied voltage, thusshowing a slow return to the normalshadow angle when high voltage isapplied. The lower the voltage, then,the more rapid the return to normalwill be.

From the foregoing we have foundhow a negative voltage will causethe eye to close and how a positivevoltage will cause it to open morethan normal. If we then apply anAC or audio voltage composed ofalternate positive and negativepeaks, the indicator deflection shouldshow a swing in both directions.This is exactly what happens and theeye shows a partial illumination overits entire deflection area with anyvoltage from approximately 4 voltsr.m.s. to 1000 volts, r.m.s. The par-tial illumination is due to the "on"and "off" time of the a -c voltage



KNOW YOUR OSCILLOGRAPH!

Prepared by the

ENGINEERING DEPT.ALLEN B. DUMONTLABORATORIES, INC.

The oscilloyraph is the most useful uniton the test bench. It is also the leastunderstood. This series explains it fully

PART 2.

Deflection Sensitivity andDeflection Factor

It is convenient to express the gainof a given amplifier by use of theterm "Deflection Sensitivity," whichis the ratio of the lineal deflectionproduced on the cathode-ray tubescreen to the r.m.s. or the direct cur-rent voltage required at the inputterminals to produce this deflection.Deflection Sensitivity, therefore,gives a convenient figure for com-parison of various types of oscillo-graphs irrespective of type ofcathode-ray tube used or the acceler-ating potential at which it is oper-ated. An increasingly desirable termused for the sake of convenience isthe term "Deflection Factor" whichis the reciprocal of the "sensitivity"ratio.

In general, the useful range of acathode-ray oscillograph extendsfrom zero frequency to several hun-dred megacycles, provided sufficientvoltage is available to allow a reason-able deflection with direct connectionto the cathode-ray tube deflectionplates. The amplifiers generally pro-vided will extend the useful voltage

Figure 4

range while at the same time will re-strict the useful frequency range.Since these two considerations tendto operate in opposite directions, afactor taking both into account isuseful in determining the perform-ance of a particular amplifier. Sucha factor is that obtained by takingthe product of the gain and the bandwidth. Consequently, it follows thatan amplifier with an extended highfrequency range will have a high de-flection factor or similarly a low de-flection sensitivity. Obviously, a largenumber of amplifying stages can beused to increase the gain to any de-sired value, providing noise disturb-ances can be kept to a satisfactoryminimum. For a device which pro-vides a visual indication, however,the requirements for stability arestringent. Unless sufficient stabilityis provided, accurate photographicrecords of cathode-ray tube indica-tions are not practical. As a result,the design of any oscillographic am-plifier is necessarily a compromise.

Square Wave ResponseSince a cathode-ray oscillograph is

primarily a test instrument, it shouldgive a true representation of the sig-nal under observation. In order toinvestigate the characteristics of anamplifier, it is common practice to ap-ply a square -wave signal, as shownin Figure 4, to the input circuit. Thesteep front of such a wave gives anindication of the high -frequency or"transient" response, and the flattop of the wave is an indication ofthe low frequency characteristics of

the amplifier, where the terms "high"and "low" frequency are relative tothe fundamental frequency of thesquare wave.Low Frequecy Distortion

If a low frequency square wavesignal is applied to the amplifier cir-cuit shown in Figure 5 between pointA and ground, and if the time con-stant of the grid circuit, C1R1, is toosmall, the signal at point B andtherefore at the output between pointC and ground, will appear as shownby the dotted line in Figure 4. Thissawtooth distortion is caused by thecharging and discharging of the ca-pacitance C1 through resistance R1during the flat top periods. This typeof low -frequency distortion racy ob-viously be reduced or eliminated bymaking the values of C1 and Si, suf-ficiently large so that the time con-stant of this part of the circuit be-comes very large. For very goodlow -frequency response, i.e., withthis type of distortion eliminated,the physical size of the capacitancerequired becomes unreasonable sincethe grid resistance must be limitedin value by the grid current charac-

July, 1944 13

teristics of the vacuum tube. It isalso desirable to keep the time con-stant of this part of the circuit assmall as possible since it will deter-mine the actual time required forthe amplifiet to recover from the ef-fects of a large transient pulse. Onemethod of obtaining good low -fre-quency response while still limitingthe size of Cl and R, is to employplate circuit compensation as shownin Figure 6. By the addition of theresistance -capacitance circuit R2 C2in the plate circuit of the amplifier asshown in Figure 6A, a voltage ap-pears at point D having a form asshown in Figure 6B. When this po-tential is added to that shown by thedotted line in Figure 4, the resultantis the original square wave, whichappears at point C in Figure 6A.This compensation must be carefullybalanced to provide the properamount of compensation to correct

(A)

---.-(8)

Figure 6

for the amplifier characteristics with-out introducing additional distortion.

Stray Circuit CapacitancesThe presence of stray circuit ca-

pacitance and the inter -electrode ca-pacitance of the vacuum tubes in theamplifier may be represented by thedotted shunt capacitance Co shownin Figure 7. These stray circuit ca-pacitances have the effect of decreas-ing the plate load impedance as thesignal frequency is increased. Highfrequencies are therefore attenuatedand the frequency response curvewill appear as shown by curve A ofFigure 8.

High Frequency Compensation

By the insertion of a series in-ductance L1 in the plate circuit of theamplifier, as shown in Figure 7, a re-actance increasing with frequency isadded to the vacuum tube plate loadto increase its impedance at highfrequencies and, consequently, to

Figure 7

maintain the amplifier gain at thesefrequencies. If this inductanceshould be increased in value abovethe optimum, a response curve simi-lar to curve C of Figure 8 will be ob-tained. This rising characteristic isobtained by resonance between theadded inductance L1 and the straycircuit capacitance Co. This type ofcharacteristic will accentuate the re-sponse to signal components over alimited frequency range, thus tend-ing to distort the signal under ob-servation. The effect is shown inFigure 9, illustrating a tendencytoward oscillation at the start ofeach half cycle of the square wave.The inductive compensation em-ployed should be so proportioned thatthe maximum increase in high -fre-quency response is obtained withoutintroducing additional distortion ofthe signal. An example of propercompensation is shown by curve Bof Figure 8, and a typical exampleof good wave response correspondingto this type of characteristic is illus-trated by Figure 10, for a squarewave of 100,000 square -wave cyclesper second. It will be noted thatusable deflections may be obtained atfrequencies higher than the high-frequency rating of the amplifiers,provided that the amplifier charac-teristics are taken into considerationand the resulting pattern properlyinterpreted.

D -C Signals

The resistance -capacitance coupledamplifiers ordinarily employed incathode-ray oscillographs will notpass direct current signals becauseof the inability of a capacitance topass direct current. Signals whichare composed of an alternating com-ponent superimposed upon a directcurrent are therefore establishedupon a new reference axis corre-sponding to the average level of thealternating component. Since meansare already available for the meas-

Ul

CC

A

FREQUENCY

Figure 8

urement of the direct current com-ponent of the signal by meters anddirect connection to deflection plates,automatically removing the d -c com-ponent results in being able to obtainfull-scale deflection, or more, of thealternating component, thereby fa-cilitating fine detail study of thepattern.

Although nearly all oscillographsdo not include direct current ampli-fiers, special instruments have beenmade with them. This problem hasproved difficult to solve since directcurrent amplifiers are in general,rather unstable, the instability in-creasing with the gain. Improve-ments have been made in their de-sign in recent years, but they are,not yet in widespread use. The uselof carrier current amplifiers intaining a high gain for direct cur-.rent use has been suggested, and fu-`ture developments may include suchamplifiers.

I itir(

Figure 10

Noise

Noise is another factor to be con-sidered in amplifier design. Noiseincludes such component factors asactual noise produced by controls,microphonics, and residual hum. Itshould be remembered that an oscillo-graph provides a visual indicationand noise, as such, is not apparentexcept as a distortion of the patternunder observation. Consequently,care is exercised in the selection ofgain controls, vacuum tube types andother components to be used. Thisparticular consideration is becomingmore important since the state of theart is indicating a trend towardhigher accelerating potentials andmore sensitive instrument amplifiersto extend the range of usefulness.

Z -Axis Amplifiers

Separate amplifiers are usuallyprovided for Z-axis or intensitymodulation of the cathode-ray beam.The considerations of the design of


these amplifiers are, in general, dif-ferent from those employed for de-flection. The output voltage require-ments are considerably less severe,while the frequency range usually ex-tends to a higher upper limit. Sincethese conditions are generally true,the design of an amplifier is con-siderably simplified, even though anextended frequency range is desired.The lowered output voltage require-ment for complete modulation of thecathode-ray tube beam allows the useof low plate impedance in the finalstage of this amplifier for extendedhigh -frequency response. Since, ingeneral, the source of signal foroperation of this amplifier is an ex-ternal signal generator, the inputsensitivity need not be too great,thus simplifying the design of thisamplifier still further by requiringfewer amplifying stages. One desir-able feature which may be incorpo-rated is a means for reversing thepolarity of the modulating signal toallow selection at will of either a re-duction or an increase in the inten-sity of the beam.

Uses

One of the principal uses of the Z-axis amplifier is to provide a meansfor impressing a timing signal uponthe pattern. The timing signal forthis purpose is supplied desirably inthe form of sharp pulses of shortduration and necessarily higher fre-quency or rate than the signal un-der observation in order to increasethe accuracy with which the time in-terval between certain events can bedetermined and in order to preventelimination of large section of thetrace. Although the linear time -base provided is very nearly linearin time, it cannot be dependedupon for highly accurate determina-tions. Therefore, use of the modua-tion amplifier for timing purposes isrecommended.

In some cases this amplifierhandles the signal used for elimina-tion of the return trace or flybackof the time -base to prevent confusionof the pattern.

AttenuatorsSince the oscillograph is a measur-

ing instrument, the power drawnfrom the circuit under test should bea minimum. The input circuits musthave provision also for attenuationof the signal to a value which may be handled by the input of the firstvacuum tube without distortion oroverload. This provision requires ahigh impedance, low capacitance,voltage divider placed across the in-put terminals of the oscillograph.The simplest method of obtainingsuch a voltage divider would be touse a high -resistance potentiometerin the grid circuit of the first vacuumtube. The use of such an attenuatorhowever, is subject to certain limi-

tations, mainly extreme frequencydiscrimination at intermediate set-tings. As shown in Figure 11, thedistributed capacitances C1 and C2produce a voltage division at thehigher frequencies. This voltage di-vision is essentially constant and in-dependent of the setting of the po-tentiometer arm. Thus, as the posi-tion of the potentiometer arm ischanged, the relative voltage divisionacross the sections of the potentiome-ter and capacitances will differ, pro-ducing serious frequency discrimi-nation. Although this frequency dis-crimination may be by using alow -resistance potentiometer, t h eloading upon the circuit under testwill be excessive. A solution of thedifficulty is to provide an input at-tenuator with fixed steps and adjust-able capacitance elements as illus-trated in Figure 12. This schemewill permit individual adjustment foreach attenuation ratio, maintaininguniform voltage division over a widefrequency range. Obviously, thiscannot be used as the only attenua-tor, since to cover a wide voltagerange and still maintain useful at-tenuation ratios, a large number ofsteps would be required. Conse-quently, an additional method of at-tenuation will be required for fineadjustment. Such a method is avail-able by the use of a cathode followerstage, providing a low impedancecathode output suitable for use witha continuous attenuator, or gain con-.trol.

One type of circuit, which involvesa cathode -follower stage, and whichwill allow a wider range of input sig-nal than conventional amplifiers isshown in Figure 13. This circuitwill, however, have a definite fre-quency limitation, but it is a definiteimprovement over other previoussystems. For the widest possible fre-quency range without frequency dis-crimination, the circuit of Figure 14will be used. With R1 and R2 bothlow in value, the circuit capacitanceswill be ineffectual even in the mega-cycle region. C1 is used as a block-ing capacitance in both cases to re-move the direct current from the con-trol R2. Both of these circuits whenused in conjunction with the fixed -step attenuator permit an extremelywide range of voltage input withoutfrequency discrimination.

Positioning CircuitsThe cathode -follower circuit illus-

trated in Figure 13 may also be usedfor obtaining a means of providing apositioning voltage for cases wherethe deflection amplifier is directlyconnected to the deflecting plates ofthe tube. Such a circuit is illustratedin Figure 15, as well as a method forconnecting the amplifier to the deflec-tion plates, and still operating thedeflection plates at or near groundpotential.

1

INPUTSIGNAL

INPUTSIGNAL

Figure 11

Figure 12

Figure 15

OUTPUT

OUTPUT

Since the cathode of V1 operates ata positive potential with respect toground, and since the return for R2


July, 1944 15

THE OUTLOOK FOR RADIO andTHE production picture on radio and

appliances is not so simple. LastOctober some high officials in Washing-ton were optimistic about refrigeratorproduction starting in the second quar-ter of this year. They talked of a yearlyrate of 900,000 to 1,000,000 refriger-ators. Since that time, the projectionhas been pushed back to the 3rd or4th quarter. Some leaders in govern-ment and industry believe that it willbe 1945 before we get under way.

Approximately the same situationexists on washers and other major ap-pliances-just last week one of the offi-cials in the Consumers' Durable GoodsDivision of the WPB refused to evenestimate when washer productionwould start. He would only state thatthere now are no definite plans to pro-duce washers at any time soon.

Of course, this outlook could changeovernight-depending upon war de-velopments.

Radio Production OutlookThe Army and Navy radio equip-

ment requirements for 1944 areeven larger than in 1943. Production

80% from January toNovember of 1943, but Major GeneralClay recently issued a statement thatsignal equipment must be expanded in1944. Despite enormous volume atCrosley in 1943, they still have unfilledorders for more than a year's produc-tion in war material of which a sub-stantial portion is signal equipment.

We find no one in authority who willventure a civilian radio productionforecast for 1944, other than the pos-sibility of making some small nearlystandardized sets for export to Cen-tral and South America and to recon-quered areas.

New Models

It is rather clearly indicated thatthe first refrigerator production willbe from the tools and dies last used.The only changes will probably be ma-terial substitutions where critical ma-terials were used in the last produc-tion.

This is a sensible program. We donot believe that the valuable time ofengineers and toolmakers should be di-verted to new model refrigerators dur-ing the emergency. Partieularly sobecause the last models which the in-dustry produced were very efficient andattractive refrigerators. The samerules will probably apply on other ma-jor appliances including washers,ranges, etc.

The refrigerator industry generallyunderstood to agree that the second

by J. H. RASMUSSENDirector of Sales.

Crosley Corporation

Factor, -to -independent -distributor -to -dealer tradingdiscussed. Accumulated demand means huge sales forradio and appliance dealers. Start prospect lists now.

models produced will have a normalyear model changes. The really newmodels probably won't appear until thefinal phases of the war have beenterminated for a good many months.

This model program is sound, sales -wise. Millions of families need anelectric refrigerator right now. Theyneed one from the very first produc-tion. Then later, sales stimulationwill be provided by sharply -improvedmodels. And still later, the new de-signs should be ready when a real salesimpetus is required. In the meantime,every one who buys will have secureda sound value, a beautiful and an effi-cient refrigerator.

Many authorities believe that ap-proximately the same program will befollowed in radio. That the first pro-duction will be from the last tools and

dies but that the quality will be im-proved because of the things whichhave been learned in the production ofthe exacting specifications of warradios. Improved manufacturing proc-esses and more rigid quality controlwill result in better quality and greateruniformity.

Undoubtedly, the first models pro-duced will have new designs in woodcabinets.

What will come later will be influ-enced by the findings of the RadioTechnical Planning Board which hasbeen organized at the suggestion ofChairman Fly of the Federal Commun-ications Commission. The findings ofRTPB and the later decisions of theCommission will have an importantbearing on both Frequency Modulationand Television.

"Voice letters" haveclicked. Sales of blanksand equipment plusmaintenance will addto dealers' incomes as"voice writing" be-comes commonplace forbusiness and personalcorrespondence too.


APPLIANCE SERVICE DEALERS

J. H. Rasmussen

In the early days of the war, therewas a great deal of discussion inand out of Washington on the revolu-tionary changes which would occur atwar end in our system of distribution.Thinking on this subject has changedduring the past six months and theconsensus of opinion now seems to haverationalized.

We at Crowley believe that the pres-ent system of distribution in the radioand appliance industry is sound. Wedo not believe that a radical change isrequired-we do not think it would bein the public interest. We went onrecord to this effect on July 26, 1943.Since that time many others have donelikewise.

The costs of wholesaling and retail-ing in radio and appliances have been

Big profits in newand replacementsales are coming todealers who handleindustrial andspecialty lamps suchas these, made bySylvania ElectricProducts, Inc.

materially reduced during the past tenyears. This has been possible becauseof improved products that give betterperformance and less service-becauseof greater efficiencies and because ofhighly expanded volume.

A further amplification of those samefactors will provide greater efficienciesand lowered costs in the future. Thatis progress. I'm sure none of us,manufacturers, distributors or retailerswant to attempt to stand in the wayof progress.

As these things are accomplished-when the costs are reduced-then themargins of distribution can be reducedstill maintaining an adequate and fairmargin of profit for the services ren-dered. When these things become factnot theory, then another great forwardstep will have been made by our in-dustry. A further contribution willhave been made to the American sys-tem.

We believe in the factory-to-knde-pendent - distributor -to - dealer - type ofdistribution.

Future of the Radio and ApplianceIndustry

We are urging our distributorsdealers to prepare for big volume in-creases in the post war market. Whydo we think the market will be solarge? Let's take a quick look at someof the facts which are now available.

Many of us often lose sight of theestablished fact that our country isgrowing rapidly. In 1940, there weresix million more persons employed, orseeking employment in this countrythan in 1929. In 1940, 46 million em-ployed persons produced more goodsand services than in any previous year.In 1941, with shorter working hours,the productivity was 25% greater thanin 1929. After the war, there will be

more than 57 million workers availableto produce and to consume. Millionsof these will want and will buy newradios and appliances.

We all know about the great de-ferred demand, and people will havethe money to buy with.

Individuals in this country had neversaved as much as 10 billion dollars inone year prior to 1941. In 1942, theysaved more than 25 billion dollars. Ap-proximately 20 billion went into sav-ings in currency, bank deposits andGovernment Bonds alone.

The savings in 1943 exceeded 30 bil-lions and if the war lasts through1944 the savings will be even larger.In the past three years, savings in cur-rency, bank deposits and GovernmentBonds have increased more than 60billion dollars. They will probably bein excess of 100 billion prior to warend.

And, during this period, installmentsales indebtedness has been reducedfrom some 9 billion dollars to an esti-mated less than 2 billion. All other in-debtedness has likewise been sharplyreduced.

So today-Americans owe less andhave bundles of cash.

The Domestic and Foreign Branch,WPB Radio Division, recently estimateda postwar market of 17,000,000 to 21,-000,000 radio receivers.

Prominent television authorities arenow forecasting that television salesin important figures will start withinone to two years after the end of theJapanese war. F. M. sales forecastsare large also.

Certainly, all of this is not an im-possibility if the RTPB studies andconclusions materialize as rapidly as isnow forecast.

The U. S. Chamber of Commerce"Third Progress Report" of a consumersurvey to measure Post War BuyingInterest for the Period ImmediatelyFollowing War's End indicates twothings :

1. That people have the money tobuy-and that

2. They expect to buy in large vol-ume.

The survey shows that even morepeople were saving money in 1943 thanin 1942. Sixty-one percent say theyare now able to save. Thirty-four per-cent say they are saving over 10% oftheir income. Actually, more than 61%are saving because 76% are buyingWar Bonds and Stamps.

Eighty-four percent are investing inone or more of the following: WarBonds, life insurance, savings accounts,mortgage retirement or other invest-ments.

Forty percent of the people feel theyare better off than a year ago. And

July, 1944 17

55% have confidence in the future.They think there will be "plenty ofjobs" for everybody the first year afterthe war.

Sixty-four percent of the Nation's35 million families name one or morepurchases they would make within sixmonths, if the war ended tomorrow.

What will they buy?3,675,000 intend to buy new automo-

biles2,625,000 intend to buy mechanical

refrigerators2,100,000 intend to buy washing ma-

chines1,645,000 intend to buy stoves1,400,000 intend to buy vacuum

cleaners.People plan to buy these large quan-

tities of appliances in six months.In addition to the appliances which

were sold in volume prior to the war,there will be a greatly increased busi-ness in many that were just getting agood start.

The frozen food cabinet is a goodexample. Only a small quantity hasbeen produced and sold but the demandwhen production is permitted has beenestimated in very large figures.

We know that big meat packers arelaying plans to put the old-fashionedmeat industry on a production basis.They forecast savings to the consumerof 20% to 30% on 60 pound frozenmeat assortments. The large foodpackers plan to get into the frozenfood business with both feet. Theyforecast better quality and lower pricesfor frozen foods than for canned orfresh fruits and vegetables.

When these programs materialize, thepurchase of a frozen food cabinet willhave an appeal from an economic aswell as a convenience standpoint. Thefood savings will result from bulk pur-

Official U. S. Signal Corps Photograph

chases so a larger compartment willbe required than can be contained ina two -temperature refrigerator.

The room cooler business was big-ger in conversation than in fact priorto the war. It was just beginning tocome into its own in 1941. Post-warforecasts vary from 100,000 to 250,000per year. But our guess is that whenwe have the right unit at the rightprice, that sales might well be one mil-lion per year.

There are many other untapped mar-kets including kitchen cabinets, gar-bage disposal units, dishwashers andso on.

So we firmly believe that the outlookfor the radio and appliance manufac-turer, distributor and dealer is a bril-liant one.

It will be easy for you to accuratelydetermine whether or not there will bea big radio and appliance market inyour community. Ask the first 100people who come into your store, "Doyou plan to buy a radio, television, F.M. radio, refrigerator, frozen foodcabinet, washer, ironer, table appli-ances, dishwasher, kitchen cabinet, etc.when production is resumed."

My guess is that if you do this youwill have the start of a fine prospectlist. Your best prospect will be thecustomer to whom you have given sat-isfactory service in the past. We knowa great deal, from firsthand experience,about how difficult radio and applianceservice problems are today. We havebeen operating three distributor serv-ice departments.

We know how difficult it is to getand to train and to replace servicemen. How hard it is to get replace-ment parts. But many distributors anddealers are actually making friendstoday through their service department.

There are servicing opportunities inthe 35,000 radio -equipped planes anti-cipated for the first post-war year.

The personnel is courteous. When theycan't give customary prompt service,a good and polite explanation is made.Customers are being created for prod-ucts when they are again available.

During the past year or two, manyprominent dealers have lost their identi-ty as radio and appliance dealers.They haven't had this merchandise todisplay or sell. Their stores today looklike anything but a radio and appli-ance store. This was a natural se-quence to the closing of production.

But I think it is not now too earlyfor dealers to start identifying theirstores as radio and appliance dealersas soon as products are available. Ap-propriate signs in the windows, in thestore, direct mail and prominent dis-play in your newspaper and radio ad-vertising will some day pay big divi-dends.

Certainly it's not too early to startan up-to-date prospect list.

During the past sixty days, I'vetalked with many distributors anddealers. There seems to be two schoolsof thought on post-war selling.

One school says-"There is such aterrific pent-up demand for radios andappliances-there are billions of dol-lars in War Bonds and other savingsthat are waiting to rush into the mar-ket as soon as production starts again.So we think there will be a 'SellersMarket' for several years after manu-facture starts. Why should we spendmoney on advertising and salesmenwhen the demand will be bigger thanthe supply? We are going to wait un-til supply is greater than the demandbefore we start to build a sales organi-zation."

The other school says-"We thinkthere is going to be a bigger radio andappliance market after the war thanhas ever existed before. But, we alsoknow that the production capacity ofthe radio and appliance industry willbe increased many fold when war pro-duction stops. Practically every menu -


11,000,000 potential users of inter-com. systems, such as this Garner Con-versocall, constitute the post-warmarket in sales and servicing.


Registered U. S.Patent Office

Park Goes Oyer To AdmiralLouis M. Park, formerly Supervisor of

Radio and Home Appliance Sales Statisti-cal, and Order Department of Stewart -Warner, has become associated with Ad-miral Corporation, Chicago, as ExecutiveAssistant, Sales Department.

In announcing this appointment, J. H.Clippinger, Vice -President in charge of

sales, said Mr. Park will devote his timeto working on sales development in cooper-ation with regional managers who are nowsetting up national distribution of AdmiralRadios and Major Appliances. Whenpeacetime production resumes, Park willhead the Sales Statistical, and Order De-partment.

Repair. BusinessFrom Department Stores

It is reported that a chain depart-ment store in Chicago is "merchandis-ing" the present frozen condition indomestic appliances by setting up fix -it departments. There they take ordersto repair worn gimmicks, from toasters,waffle irons, washers, refrigerators,etc., to radios. The work is farmed outto various independent servicing organ-izations.

Though many radio services dealersare working against time, often intothe small hours, to keep up with thedemand for repairs, there may be somewho are in a position to benefit con-siderably from this potential source ofadditional income.

What happened in Chicago can wellbe duplicated in any community, largeor small. Say a dealer works out anarrangement with a local departmentstore, or furniture store, to handle re-pair work on certain appliances inaddition to radios. It might be doneon a percentage or flat "trade fee"basis. The service dealer might billthe department store monthly, allow -

July, 1944

ing 20% or so to the store, which willcollect the individual customer items.Or there may be a flat "spiff" to thestore for every job turned in, dependingon the amount of billing.

The announcement about the Chicagoset-up says nothing about having thedealer's name displayed in the fix -itdepartments. But that is almost atrade obligation, anyway. There's nodoubt that the department stores willhave recourse to the service dealer inthe case of complaints. The work will,of course, carry a guarantee, with theusual provisos regarding parts andlabor. Where a proposition like thatdoes work out, the stores can put acrown on their efforts to cater to thepublic by stressing the fact that theyare employing reliable service dealerswho join them in their guarantees.And while dealers may never learn theidentity of the people whose appliancesthey are repairing, they can amass avast amount of extra good will in theircommunities-a priceless ingredient for

business planning-plusadditional cash income.

Sally Siles Debut"Sally Silex" is the pert new trade

character now featuring in an extensiveadvertising campaign by the Silex Com-pany, originators of the glass coffee

Sally

makers. "Sally" will appear in 180,-000,000 national magazine impressions

during 1944 and will tell how to handleand take care of modern home equip-ment such as glass vacuum coffee mak-ers, or Silex automatic steam irons.

Improved All -Appliance TesterA new improved electrical appliance

tester is now built to operate at an ex-tremely low range of 0-20 watts aswell as the high range to 2000 watts.It tests all electrical appliances frombell transformers and clocks to elec-tric ironers and ranges operating on the220 -volt three -wire Edison system.

The tester measures actual loadvalues of volts, amperes, and watts.Quickly locates trouble in A. C. appli-ances while they are in actual opera-tion. It is protected from accidentaloverload by means of a fuse. Overalldimensions are 9%" high, 614" wide,3" deep; weighs 8% lbs., and the meteris 4" square. This is the new Model900 manufactured by the Hickok Elec-trical Instrument Company, 10533 Du-pont Avenue. Cleveland 8, Ohio.

Proctor Toaster Repair HintThe utmost care in packing must be

taken when returning a model No. 1430for repair. The bakelite base is fragileand must be protected against breakagein shipment. The toaster should bepacked in its original carton with suffi-cient inner packing to prevent thetoaster from rattling in the carton.This original carton should in turn bepacked in a larger carton with ex-celsior packed tightly around the bot-tom of the carton to protect the baseof the toaster.

If these instructions are not followedthe risk is very great that the toasterwill be received with a broken base.

19

SECTION XL

Teckiical ge!wieePoiliefigs9'

PAPER CAPACITORS AsMICA CAPACITOR SUBSTITUTES*

AS A MEANS of meeting theshortage of mica capacitors,various capacitors of other

types have been proposed as alter-nates. Included among the suggestedsubstitutes are the impregnatedpaper capacitors of both tubular andmolded-bakelite construction.

Paper capacitors of several typeshave been tested by the capacitormanufacturers to determine theirsuitability as mica condenser substi-tutes. Among the electrical charac-teristics investigated are the Q,power factor, insulation resistance,temperature coefficient of capaci-tance, and working voltages. In de-termining the suitability of substi-tute capacitors, it has been necessaryto keep in mind the particular appli-cations in electrical circuits in whichmica condensers have distinguishedthemselves, and to respect size re-,quirements already set by mica capa-citor dimensions.

TypesBakelite -molded paper condensers

usually resemble standard moldedmica units in shape; and their sizesare not much different from those ofmica capacitors. The capacitor sec-tions may be of "stacked" construc-tion or may be "wound" and flat-tened. The molded paper condensermay be impregnated with oil or wax.

Special tubular paper capacitorsfor mica substitution resemble stand-ard tubular units except for theirreduced size. These condensers aregenerally oil -impregnated and areprovided with cylindrical metal con-tainers, with or without an outer in-sulating sleeve.

* By the Engineering Department ofAerovox Corp., New Bedford, Mass.

War -time conditions made mica capacitors unobtainablefor civilian radios. Methods for substituting availablepaper capacitors are discussed in this timely article.

Substitute paper condensers of bothtypes cover a wide range of capaci-tance values. While it is desirableto replace as many of the mica typesas possible, it is particularly import-ant that alternates be provided forthe larger condenser value unitswhich employ the greatest amountof mica. Prominent in the latterclass are units with capacitance rat-

ings of 0.002 mfd., 0.005 mfd., and0.01 mfd., which are employed invarious coupling, blocking, and by-passing positions in radio and elec-tronic circuits.

Sizes

Bakelite -molded paper capacitorscan be found with approximately thesame dimensions as corresponding

Capacitors of Mica and their Paper Equivalents.


TECHNICAL SERVICE POR TFO 10 S E ("I' ION XL

mica condensers up to 0.01 mfd.These units are usually molded inblack bakelite in accordance withtentative specifications of the Amer-ican Standards Association.

Special small -sized oil -impregnatedpaper tubular condensers up to 0.01mfd. capacitance are obtainable inoverall lengths from 1" to 1 13/16"and diameters from 5/16" to 7/16".Outer insulating sleeves add 1/16" tolength and 1/32" to the diameter.These small sizes should enable di-rect replacement of mica unitsmounted in close quarters.

Electrical CharacteristicsThe electrical characteristics of

substitute paper condensers dependupon the material employed as adielectric (at least as far as dielec-tric constant is concerned), and theproperties of the oil or wax impreg-nant.

In general, a low Q value (10 to 30at 10 Mc.) may be expected. Powerfactor will be approximately 0.5%at 1000 cps. Insulation resistance willbe of the order of 8000 to 10,000

. megohms at 500 volts dc. Residualinductance will depend upon the typeof construction and lead length, andis usually of such magnitude that theresonant frequency of the 0.01 mfd.

R.F. AMP.

6K71st. DET.

6J7

unit occurs in the vicinity of 10megacycles.

Beyond the resonant frequency,the condenser is generally consid-ered as unsuitable for by-passing inhigh -frequency circuits. However,this is not entirely true. Statingthe matter in engineering terms, thereactance of the capacitor does be-come inductive at frequencies higherthan the resonant point, but an in-ductive reactance can be as efficienta by-pass path as a capacitive re-actance, as long as the reactive pathis considerably lower in ohmage atthe operating frequency than is theby-passed path. This will be trueexcept when phase angle of the feed-back voltage is of importance. Thus,for instance, an inductive reactanceof 1 ohm or thereabouts might by-pass effectively a tube cathode re-sistor of 500 ohms. At a certainnigh frequency beyond resonance,the inductive reactance will becomeequal to the resistance of the by-passed component and its by-passingability, accordingly, will be de-stroyed.

Temperature coefficient of capa-citance for the 0.01 mfd metal -en-cased tubular substitute paper unitwill be positive and of a low value.Temperature coefficients of both

1st. I.F. AMP.

6K7

"X" indicates position ofsubstitute paper capacitors

Cp - paper capacitorCm - mica capacitorCe - electrolytic capacitor

FIG.4

Cm

2nd.I.F. AMP.6K7

capacitance and power factor aregoverned by a number of factorswhich are of special concern to themanufacturers and some servicemen.

Capacitance tolerances of substi-tute paper units up to, but not in-cluding 0.01 mfd capacitance, are-20 to +50%; for units of 0.01mfd capacitance, the tolerance is-10 to +40 %.

Common working voltages for thesubstitute paper condenser are from300 to 800 volts dc for capacitancevalues between 0.001 mfd. and 0.01mfd. Some of the types have alreadygiven good account of themselves onlife tests conducted by the manufac-turers as well as their customers.

Ability of the substitute units towithstand water immersion accord-ing to any standard specifications isa function of the condenser casing,rather than of the type of element orimpregnant. This is important inmoist locations.

ApplicationsIt has been common practice to

employ mica condensers in certaincritical positions in r.f. circuitswhere equivalent series resistanceof the unit must be of a low magni-tude. One such application is the


c;

2nd.DET,IstA.F.AMP.688

TOHEATERS

2nd.A.F. AMP.

6F6

Ce

Illustrating where paper capacitors may be substituted for micas in a super -het circuit.

July, 1944 21

Odds 'n Ends by L.C.S.One minute Tommy Dorsey was lined

up for the "Bandwagon" summer ser-ies . . . the next had the Victor maestrobooked for the "All Time Hit Parade.". . . Things whizz in music bizz! ArtieShaw fans swarm backstage to checkRomeo Penque, who looks so much likeArtie and plays like him that even hisfans are confused. . . . Sammy (Okaye)Kaye and his boys got the big handin a couple of theater runs in Man-hattan last winter . . . so now the swingand sway topper has another New Yorkdate which will keep the band in thecity all summer . . . the first in threeyears. . . . Dinah Shore and Lena Horneare sharing in another of the army'soverseas "command performance" radioprograms. . . . Sings Dinah: current hit"Long Ago and Far Away." . . . Lenarevives "Mad About the Boy," from her"Moanin' Low" Victor album. . . . Lenawill glamor them at Chicago's swankChez Paree nightery this summer, soonas she finishes her "overseaing." . . .

The West Coast rumors Artie Shawwill debut a new dance orchestra soon,like the one he led before joining theNavy. Artie got his honorable dis-charge after grooving through theSouth Pacific with his Navy band. . . .

On D -Day, workers in plants every-where heard special programs of re-corded patriotic music over internalbroadcasting systems. Could be the in-dustrial network might have polled"Good Bless America" a spot on theHit Parade that day!

Glen Miller

Vaughn Monroe (Victor) was named"Bandleader Father of the Year" by theNational Father's Day Committee. . . .

"Candy," his two year old heartbreakeris dad's number 1 fan. . . . Buddy Richis with Tommy Dorsey again, but he'sset on handling his own crew and soon.. . .Alvino Rey, "name" bandleader, wasthe shy sailor who carried a guitar un-der his arm on a recent "Meet YourNavy" network broadcast . . . but hewouldn't tell until he was introducedon the program. . . . Lena Horne . . .

gets orchids from the Committee forUnity in Motion Pictures as the mostoutstanding Negro actress of the year,sharing honors with singer Dooley Wil-son. . . . Wayne King, now a Major inthe Army, will debut a new army radioshow over the Blue. . . . Victor hastimed a new disc release with Wayne'spublic reappearance . . . "Amor" is ,thedisc, soon on sale. . . .

The late Fats Waller's piano teacher,James P. Johnson, got the first copy ofVictor's memorial album, "Fats WallerFavorites," on the Eddie Condon Jazzshow. . . .Perry Como, Victor's bari-tone, is back in New York from pix-making in Hollywood. . . . Duke Elling-ton is touring upper United States andCanada and will start a concert serieshere soon. . . . Glenn Miller's Army AirForces band is out cultivatin' for theFifth War Loan Drive. . . .

Charlie Spivak gets the special rib-bon from the Merchant Marine . . . hisband cheerfests frequently at hospitalsfor injured seamen. . . . Duke Ellington(Victor) and poet Langston Hughes aredoing a song soluting Negro membersof the WACS. . . . Vaughn Monroebooks Paramount New York for August. . . and will guest -spot soon on theBlue's "The Music America LovesBest." . . . Extravaganza version of"The Ziegfield Follies" in technicolorsets up three songs for Lena Horne. . . Dinah Shore is underwater pinup(girl . . . submarine (secret) skippersays the crew has two hobbies . . .

hunting Japs and dallying over Dinah'sdiscs. . . .

Spike (the) Jones is dated with a fullsize dance gang . . . dubbed SpikeJones and his other orchestra . . . ball -rooming on the West Coast . . . comeballads or city slicker stuff, either way,the band surpleases 'em. . . . Hal Mc-Intyre has Ruth Gaylor vocalizing withhis orchestra . . . able Ruth has been"stuffin' her do" with America's finestbands, and still is. . . . With being pro-

filed by our est. contemp. "New Yorker"and all, where do Duke Ellington findthe time to plan that long series ofConcerts de Jazz ? . . .

Record ReviewsRCA -Victor;

Piano Music of Villa -Lobos (Brazil),"The Child's Family"; final side, "Joyin the Garden" (Suite Floral Op. 97)-in Album M-970. Played by ArturRubinstein.

This is a Victor national special re-lease. Artur Rubinstein heard someVilla -Lobos compositions and soughtout the composer in Brazil. Villa -Lo-bos shows a first-hand knowledge ofhis country's folk music and primitiverhythms. No wonder he cast aside ac-cepted forms, showing unusual original-ity in his compositions, which includeorchestral and solo instrumental worksas well as choral music.

In spite of the title, "The Child'sFamily" is not children's music, but israther a series of tone sketches abouta doll family which a child accumu-lates. Artur Rubinstein's performanceof these seemingly light pieces is amarvel of piano sorcery evoked withhis flying fingers and insinuatingphrasing.

"Fats" Waller Favorites (Album P-151.) "Fats" himself, Piano and Or-chestra.

These have been lonely months inthe music business since the death of


Tommy Dorsey


Our Cover: NEW IN RADIO

MANY dealers who have "comealong" in the last year or

two have been wondering howmany army and navy -trained ra-dio men (and pre-war radio serv-icemen who have been engagedsince Pearl Harbor in war plantsat high wages), contemplate go-ing into the radio business as soonas they are mustered out or losetheir present-day war jobs.

Dealers will be interested tolearn that legislation is beingcontemplated to require returnedwar veterans and ex -radio serv-icemen to obtain licenses to prac-tice as independent radio service-men. Also, that many pre-warradio servicemen and others, nowin the armed forces, have opinedthat when they are mustered outthey do not intend to enter theradio dealer or service field as in-dependents, but will rather seeksalaried, full-time positions as in-stallation -maintenance men forairlines, bus and taxi lines, rail-roads, ship lines and other indus-trials that will use radio communi-cation extensively in post-wardays.July, 1944

"Ridey-Talkies" Promise Busy Post -War Era for RadioServicemen. Above: Motorola's 2 -way FM Radiotele-phone used on Locomotive to contact Train Dispatcher.

In this vein, our front coverthis month shows a railroad en-gineer and fireman using a Motor-ola 2 -way radiotelephone whichoperates between the train dis-patcher's office and the locomo-tive cab. The apparatus is in-tended to facilitate the safer han-dling of passenger trains and tre-mendously speed up freights con-veying war materials in trainyards and on long hauls.

There is further promise forex -service radio specialists in theannouncement by the GeneralElectric Company's ElectronicsDepartment and the taxi indus-try's Cab Research Bureau, Inc.,that a "ridey-talkie" version ofthe war's walkie-talkies will be in-stalled right after the war in taxi-cabs, beginning with Cleveland'sfleets. Benefits claimed are:establishing contact with any cab

instantly anywhere; eliminatingall present unattended call boxesand their direct lines to cab head-quarters; reducing "dead" mile-age and thus conserving gasoline,rubber and extending the life ofthe cab itself.

When it comes, radio service-men may have this stationary ap-paratus to cope with, in the be-ginning : one main and two sup-plementary transmitters, eachhaving four channels with 100cabs assigned to each channel. Inaddition there will be thousandsof units of cab equipment to serv-ice.

These are just a few of manynew applications of radio -in -indus-try which will provide men re-leased from military service withthe post-war job opportunitiesmany of them are seeking.

23

Ai&te; kfditot

OPA-TUBE CEILINGEditor:

Your June issue article, "Is TheOPA Tube Ceiling Fair?" is one of themost outstanding, truthful statementsof fact I have come across in anyradio trade paper. The facts you putinto print indicate unquestionably thatyou are for independent service deal-ers. You have chosen sides and I amcertain that as more and more radioservicemen read your articles they willacknowledge your publication as the

one radio trade magazine of, by andfore servicemen.

You did not try to appease eitherthe OPA, jobbers or servicemen. Yourarticle revealed conditions as they ac-tually are. Let us offer a vote of grati-tude to the trade magazine which hasdared print the truth in the interestsof America's radio servicemen.

Burt SelleOhio

Thanks, Mr. Selle, and tie hundredsof other dealers who wrote us in likevein. Since its inception RADIOSERVICE DEALER has openly opposedand crusaded against jobbers who doretail service in direct competition withservice dealers.

We'll carry on the campaign andadvocate Governmental laws to correcta bad situation that is getting worse.

JOBS TURNED AWAYEditor :

I am a full-time radio serviceman and

-MizeM ICROPHON ES

The extent of our line is but partially illustrated in this ad-vertisement. Our current production is now being utilizedin essential services, Soon, however, there will be Electro-Voice Microphones available for civilian use... and thesewill be described fully in subsequent advertisements.

In our South Bend laboratory, we have complete facilitiesfor accurate frequency checking, harmonic wave analysis,measurement of ambient noise. etc. Electro-Voice Micro-phones reflect painstaking care in design and construc-tion by superior performance in the field. They serve youbetter . .. for longer periods of time.

If your present limited quantity needs can be filledby any of our Standard Model Microphones, withor without minor modifications, we suggest thatyou contact your nearest radio ports distributor.

Paper Packs a.0e

Save Every Scrap ft.

ELECTRO-VOICE MANUFACTURING CO., INC. 1239 SOUTH BEND AVENUE SOUTH BEND, INDIANAExport Divisions 13 East 40th Street, New York 16, N. Y. - U. S. A. Cables: ARIAS

dealer operating a shop in a town of 9,000,eight miles south of the end of Boston'ssubway system, so whatever you publisherscan do in helping the radio servicing in-dustry will certainly be appreciated by allof us engaged in this headache of abusiness.

I am forced to turn away five to eightsmall sets daily for lack of 50L6, 12SA7,12SK7, 25L6, and other types of tubeswhich cannot be secured from any Bostonwholesaler, only in lots of two or three amonth, provided you stand in with thejobber and give him plenty of business.We keep getting tips about some blackmarket source of tubes at list, or 50c to$1.50 above list. The same applies to wirewound resistors, power transformers, etc.,and lately a serious shortage exists in evenlow voltage electrolytic condensers whichare needed in many small set servicingjobs.

Lately Boston and New York jobbersare circularizing the trade with lists ofadapters for using one tube in place ofanother. These combinations use a 7A8in place of a 12SA7, a 47 to replace a 45,and so forth, when no one has any, eitherwholesale or retail, and the substitute tubessuch as 7A8, 7B7, 47, etc., are as difficultto obtain as the tubes they are supposedto replace. The public knows nothingabout these conditions, only reading dailypaper bla-bla about "Eight Million RadioTubes To Be Released," and when theyare most of the numbers are slow movingtypes that have been in the jobbers' ware-houses for the past two or three years suchas types 26, 27, and other numbers thathardly anyone wants.

Probably the above is what you haveheard a thousand times in the past yearbut it is the problem the serviceman facestoday and something should be done to geta few scarce tubes into the hands of allthe services who need them so badly atthis time.

Arthur T. DolanMassachusetts

ANNUAL INDEXEditor:

I have copies of your magazine sinceits first issue and I continually referto many articles published severalyears ago. The Annual Index pub-lished in your 1940, 1941 and 1942December issues were a great help butwhy didn't you publish an Index of1943 text content?

Frank PoltingIdaho

WPB paper restrictions were so acutewe had to decide whether to run anIndex or omit two articles. Perhaps wecan have a 19l I Index.

POST-WAR DEALEREditor:

In Your May issue is an article thatinterested me very much. It's aboutthe plans of radio and electrical appli-ance manufacturers for post-war. Iam now in the Army (Signal Corps)but want to get in touch with the man-ufacturers so I can plan my post-warcareer as a dealer.

L. B.requested the manufacturers to

sen you data.

JUKESEdiVor:

I would like to see you publish somearticles on juke boxes, for example,Wutl,itzer and Seeburg's remote controljobs.' Also, I would like to have yourideas about future juke boxes and


24 Radio Service Denier

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Letters To The Editor(Continued from page 24)

whether you believe television will tie-in with jukes.

Joseph VenciPenna.

We will try to accommodate you.

CALLING DETROITEditor:

What radio serviceman's organiza-tion do we have in Detroit?

Helene PutryaMichigan

Before Pearl Harbor Detroit had anexcellent Chapter of Radio Servicemenof America, Inc. The National RSA

suspended activities "for the duration."Perhaps the Detroit group still func.tions. Can some Detroiter answer this?

ARE DEALERS CONSUMERS?EDITOR:

Please refer to your article on page10 of the June, 1944, RADIO SERVICE -DEALER. In the third paragraph youmention that sales at wholesale mightexclude sales to dealers. I see no needfor lengthy discussion to correct thethoughts you convey.

Pick up Document 31336, Rev. SR14, and study paragraph A : "MaximumPrices for Sales at Wholesale." Veryclearly wholesale sales are mentionedas sales to dealers. Enclosed is thatregulation with a few pertinent words.

In reading paragraphs A and B, we

TODA Y in WAR ...TOMORROW in PEACE

Brach Marine Antennas and Mounts are now manufactured100% for the service of Uncle Sam's amphibian tanks, PTboats, etc. But with the dawn of Victory we shall be ready

and able to utilize our enhanced experience and wartime

"know how" in supplying the civilian requirements for

antenna equipment for ship -to -shore communication.

L. S. BRACH MFG. CORP.World's Oldest and Largest Manufacturers of Radic Antennas and Accessories

55-65 DICKERSON STREET NEWARK N. J.

find three classes of activity involved.In paragraph B it is the ultimate con-sumer (civilian) and industrial, com-mercial, governmental and institutional.In paragraph A we find the retailermentioned as a person other than theultimate user.

Although the word "dealer" is notmentioned, the deduction necessary isvery slight. Eliminating those men-tioned, that is industrial, commercial,governmental, institutional and ulti-mate consumer, we must be pointing atthe dealer. It is just a matter of read-ing and re -reading paragraphs A and B.

The balance of the article is reallygood. We agree 100% that consumerservice has no place in the parts dis-tributor's activity.

We thank you for the many finearticles in your good magazine.

M. H. Kirkeby, Pur. Agent,Lew Bonn Company, Minn.

Mr. Kirkeby is absolutely correct butas some jobbers find it "convenient" notto interpret paragraph A of GMPA,Amend. 134, as he does, we are asking forlegislation that will compel jobbers toconfine their activities to wholesale sell-ing so service dealers can get the mer-chandise intended for their use by manu-facturers without danger of reprisal.

OPA ChangesDaniel L. Jacobs, from York Auto-

motive Distributing Co., radio distrib-utors, becomes a head of the Radioand Miscellaneous Unit.

Ernest W. Heilmann, from A. G.Spalding & Bros., becomes section headsupervising pricing actions for radiosand musical instruments, sportinggoods, bicycles, dry batteries, house-wares, hardware, luggage, watchesand other personal accessories.

O'Leary of Belmont to WPBAppointment of Frederick A. O'-

Leary, of the Belmont Radio Corpora-tion of Chicago, as chief of the radioand radar section of the productiondepartment, is announced by W. H.Wheeler, Jr., regional director of theWar Production Board. This depart-ment assists New England military elec-tronic equipment manufacturers withproduction, scheduling, procurement,manpower and priority problems.

Mr. O'Leary was formerly associatedwith Raytheon Manufacturing Com-pany, Waltham, and the Eastern Com-pany of Cambridge, Mass.

More Batteries, Says WPBRadio dealers and other merchants

who handle farm radio batteries aretold by WPB's Director Stanley B.Adams that an increase in battery pro-ducti9n is expected this fall. Overseasneed for batteries have increased enor-mously, but WPB is trying also to stepup civilian production because lack ofbatteries may prevent people from tun-ing in on important radio messages andparticipating in vital war programs.

Synthetic Wire Insulation ComingLarge-scale, peacetime use of plastics

and synthetics in place of natural rub-ber as insulation for electrical wires,

2G Radio Service Dealer

PICTURE PAGE of Mt. Carmel's Famed Precision -el

Ever hear the story of how "precision -el" originated? Itwas corned by a writer who visited the Meissner plant atMt. Carmel some time ago. He had watched in amazementas hundreds of flying fingers handled intricate and delicateassignments with unerring precision. "This," he was told,"is just a small part of Meissner's personnel . . . ""Personnel?" he exclaimed. "Well, from what I've seentoday, I'd call them 'precision -el'! No wonder Meissnerhas such a reputation for quality!"

Time Out! This busy worker pauses for only a fleetingsecond as the roving photographer snaps his picture. Hedoes his part in making the vital and highly technicalproducts with which Meissner supplies Allied armed forces'round the world.

Precision -el at Work! These young women, like many Mt.Carmel residents, have literally learned the electronicbusiness "from the ground up." They are versatile enoughto handle any one of many difficult assignments.

Specialist! Mt. Carmel, Illinois, is said to have more electronic techniciansper thousand population than any other city in America. This young ladyis one of many experienced workers at Meissner's Mt. Carmel plant.

Veteran! Here is another reason for Meissner's top reputation for pre-cision work. Meissner people rightly take pride in their job, in their ownpersonal production.

Ncw! Special 1944 BulletinHere's what everyone in theindustry needs to know aboutMeissner's 1944 line of radioparts. Contains complete de-scriptive matter, with pictures.Now, more than ever, it pays tokeep posted on what Meissneroffers. Send for your copy today,because the supply is limited.Free! Write to address below.

it188511/MANUFACTURING COMPANY MT. CARMEL, ILL.

ADVANCED ELECTRONIC RESEARCH AND AtiN/FACTURN

27July, 1S44

cables, and cordage was forecast byH. W. Clough, vice president of theBelden Manufacturing Company, at arecent conference of the company'ssalesmen and engineers in Chicago.

Belden research laboratories, whichadapted the materials to meet specificwar needs when the natural rubberstringency developed, is continuing todevelop still greater peacetime appli-cations. In many applications thenew plastics and synthetics are su-perior to natural rubber; in others theyare equally efficient. Resistance toacids and oils, ability to withstand highand low temperatures, and extremeflexibility were listed as among theirfavorable characteristics. Consideringthese desirable qualities, costs comparefavorably with natural rubber andshould be no bar to use after the war.

Just as the last war gave great im-petus to American development of thedye, automotive, and radio industries,the experiences in this war will givepowerful impulse to the growth ofplastics and synthetics, Mr. Cloughstated. Television, electronics, avia-tion, the electrical appliances field, au-tomotive vehicle owners, and house-holders will benefit in many ways fromthese products, including the economiesfrom increased efficiency, longer life,and greater utility. An additional ad-vantage is the variety of beautiful col-ors in which many plastic materials areavailable.

A Wider Range OscillographAt Moderate Cost

Allen B. Du Mont Laboratories, Inc.,Passaic, N. J., announce their new Type

TRANSMITTING TUBESCATHODE RAY TUBESSPECIAL PURPOSE TUBESRECEIVING TUBESINCANDESCENT LAMPSFLUORESCENT LAMPS

KEN-RADEXECUTIVE OFFICES

OWENSBORO KENTUCKYEXPORTS 15 MOORE STREET NEW YCORK

248 oscillograph, available at moderatecost. It is portable, suitable for lab,production or bench -test work. The in-strument reproduces either transientor recurrent phenomena. The wide bandvertical axis amplifier is usable to 10MC. 4,000 volts.

Big Future For RadionicsSays E. F. McDonald

"When I left the Navy at the end ofWorld War I, I went into radio becauseit was young, interesting and exciting.In 1920 many looked upon radio as anunimportant part of the electrical in-dustry, underestimating its potentiali-ties. In Zenith's early days many deal-ers, even of phonographs and musicalinstruments, refused to consider han-dling radios," writes Commander E. F.McDonald, Jr., in Zenith Radio Corp.'shouse organ, Radiolog, for May, 1944.

"Today radio and electronics are onlytwo subdivisions of the vast new sciencecalled "radionics" which with many

E. F. McDonald

Radio Service Dealer28

NEWLETTERCONTESTfor SERVICEMEN!ELEVEN 1st PRIZE WINNERSIN 5 MONTHS IN CONTEST #11

Yes sir, guys, the hundreds of letters receivedwere so swell that double first prize winnershad to be awarded each of the first fourmonths and there were triple first prize win-ners the fifth and last month . . .

SO -HERE WE GO AGAIN!Get in on this NEW letter contest-write andtell us your first hand experiences with alltypes of Radio Communications equipmentbuilt by Hallicrafters including the famousSCR -2991

RULES FOR THE CONTESTHallicrafters will give $100.00 for the best letter received during

each of the five months of April, May, June, July and August. (Deadline: Received by

midnight, the last day of each month.) ... For every serious letter received Hallicrafterswill send $1.00 so even if you do not win a big prize your time will not be in vain. . . .

Your letter will become the property of Hallicrafters and they will have the right toreproduce it in a Hallicrafters advertisement. Write as many letters as you wish. V -mail

letters will do. . . . Military regulations prohibit the publication of winners' namesand photos at present . . . monthly winners will be notified immediately upon judging.

BUYMOREBONDS!

Who -afters RADIO 4dikow

THE HALLICRAFTERS CO., MANUFACTURERS OF RADIO AND ELECTRONIC EQUIPMENT, CHICAGO 16, U. S. A.July, 1944 29

"THE HELP SITUATION by Lariat

SEQVICt-DEP'r

Employees really need vacations this year.High speed effort, long hours and per-sonal war -born worries cause fatigue thatcan be relieved only by a completechange.

How to maintain production during thevacation period? That is the problem ofall employers today.

True, temporary, substitute help is notavailable, but permanent authoritativehelp is yours for the small effort of order-ing Rider Manuals and Rider Books.

These time-savers should be by the sideof your employees all year 'round, direct-ing them to better, more efficient methodsof radio servicing and providing themwith the reference material they need tohandle the huge volume of work comingto your shop today.

Have all thirteen volumes of Rider Manualon each of your benches and circulate theother Rider Books among your employees.

The greater their knowledge, the bettertheir tools-the bigger their production.Place that order today!

HERE'S HELP THAT

KNOWS NO

VACATION

RIDER MANUALS (13 VOLUMES)Volumes XIII to VII $11.00 each volumeVolumes VI to III 8.25 each volumeAbridged Manuals Ito V 11 volumel....$12.50Automatic Record Changers and Recorders 6.00

OTHER RIDER BOOKS YOU NEEDThe Cathode Ray Tbe of Work

Accepted authority on subject $3.00Frequency Modulation

Gees pr;nciples of FM radio 1.50Servicing by Signal Tracing

Bask Method of radio servicing 3.00The Meter at Work

An elementary text on meters 1.50The Oscillator at Work

How to use, test and repair 2.00Vacuum Tube Voltmeters

Both theory and proctice ..... .. 2.00Automatic Frequency Control Systems

- also ouromotic tuning systems 1.25A.0 Calculation Charts

Two to live times os last as slide rule 7.50Hour-A-Day-with-Riclitr Series-

On "Alternating Current, in Radio Receivers"-On "Resonance & Alignment"-On "Automatic Volume Control"-On "DC Voltage Distribution" 90c each

JOHN F. RIDER PUBLISHER, INC.404 Fourth Avenue, New York 16, N. Y.

Export Division: Rocke-International Corporation13 E. 40th Street, New York City Cable: ARLAB

GIVE YOU THE HELP YOU NEED!

RIDER MANUALS V,

Call your nearest Stancor Jobber...or write us for his address

STANDARD TRANSFORMER CORPORATION1500 N. HALSTED STREET CHICAGO

STANcOR

new developments, most of them sosecret that not a whisper of even theirexistence has reached the public, isproving to be our supreme weapon inthis war.

"It is my opinion that radionics is atthe same point today as radio was in1920, and I believe it will open newfields equally beneficial to the industryand its dealers."

Meissner Post -War PlariniugOden F. Jester, vice president of the

Meissner Manufacturing Company,Chicago and Mt. Carmel, Ill., completedan 8,400 mile tour recently duringwhich he talked to representative radiodealers and distributors in large trad-ing areas and surveyed conditions pre-paratory to organizing the company'sdistributing organization.

Intended for distribution to the up-per -income market, the Meissner radio-

Oden F. Jesterphonograph will require a rather uniquesales and distribution policy. Said Mr.Jester: "Only dealers who can demon-strably sell the upper -income market,who are themselves well established intheir trading areas, and who can offeran unusual type of customer service,will be chosen. Since production willnot begin for some time, we are beingvery careful and deliberate in estab-lishing our general national salespolicy."

The Meissner advertising campaignhas been running in top -rank nationalmagazines and radio trade publicationssince the beginning of this year. Deal-ers can learn more about Meissner setsfrom Mr. Jester in the company's boothat the coming convention of the Na-tional Association of Music Merchantsin Chicago.

Estey JoinsBurton Browne

F. Clifford Estey, a well known ex-ecutive in both the radio and metalsfields, has been appointed assistant toBurton Browne, president of BurtonBrowne Advertising, 150 East SuperiorSt., Chicago.

"Cliff" is one of the real oldtimersin the amateur shortwave radio, hav-ing started his tinkering about 19un.Oldtimers will remember him as LAFVwho created quite a stir in 1921 withhis 70 foot vertical antenna.


SPRAGUE TRADING POSTA FREE Buy -Exchange -Sell Service for Radio Men

ASK FOR THEMBY NAM E

If you appreciate the TradingPost Advertising Service -andhundreds of servicemen have toldus that they do -we know wecan count on you to ask forSprague Atom midget dry elec-trolytic capacitors by name, andto insist on getting them when-ever they are available. Atomsare smaller, less costly, and arefully as reliable as the big, old-fashioned condensers they re-place. Use them universally onall of your jobs. They're moredependable -they speed up yourwork !

WANTED FOR CASH -RCA Voltohmystand Phllco 030 dynamic tester. KennethC. Sanford, c/o Smith & Phillips Co.,409 Washington St., E. Liverpool, Ohio.

WANTED -Tube checker, must test Wet-els, etc. Also want sig. generator, preferx-tal controlled; Also small (15-20 watt)P.A. system complete. G. H. White, 449Wellington Rd., Mineola, N. Y.FOR SALE-Philco dynamic tester #030,$18; Philco condenser meter #010, $6;Superior #1280 tube and set analyzer,$24. All in 1st class shape. Stephen G.Meyers, 1709 Hilton Ave.. Ashland, Ky.

FOR SALE -Set of Rider's manuals vole.#4 to #13 incl. complete with index.Brand new. $80. Henry L. Pershall, 509Deer Park Ave., Babylon, L. I.. N. Y.WANTED -Good sig. generator, ohm-meter, tube tester, condenser tester. De-scribe fully and I'll reply. N. W. Luckey,Bancroft Hotel, Bend, Oregon.

WANTED -Communication receiver suchas Echophone or equivalent of compara-tive size. Rush information. Sgt. Mor-gan L. Stirling, Crew 5333, Combat ChewHeadquarters, Biggs Field. Texas.

FOR SALE OR TRADE -Limited quan-tity Philco di -pole F -M outdoor an-tennas compl. with mtg. couplings &50' transmission line, in original sealedcartons, Philco part no. 45-2926, $8.25list, will sell for $4 ea. or trade for12v and 2v type tubes. No. C.O.D.'s.Send check or M.O. A. Brindles, RadioTechnical Service, 2821 W. Girard Ave.,Philadelphia 30. Pa.

FOR SALE -Vol. 1 to 7 incl. of Rider'smanuals, good condition, complete withindex. Also Burton signal generator #11,battery Operated, range 100 kc. to 70mc. C. F'. McCracken, Hughes Park,Bridgeport. Pa.

FOR SALE -Tubes, cartoned and un-cartoned, all guaranteed: 8A7. 6A8;6K7; 43; 45; 58. Otis B. Martin, Jack-sonville. Ark.

FOR SALE -Overstock of power trans-formers, all new, boxed, 115v 60 cycle,std. makes. 1/50 m11 - 3/70 mil - 4/90mil - 4/150 mil - 2/160 mil -.5 and6.3v filaments upright mtg. 5/90 mil -1/110 mil 2.5 & 5v filaments, uprightmtg. 5/60 mil - 9/75 mil - 3/90 mil -6/125 mil - 14/150 mil 1/120 mil withmotor tuning winding -5 & 6.3v fila-ment winding -I full shell universalmounting. Cupolas Radio Service, 1813- 29th St., Galveston, Texas.

WANTED -Following tubes: 80; 45; 26;27; 56. Advise price for immediate cash.Clarence Stinnett, 1721 Elm Ave., Lynch-burg. Va,

WANTED -A complete set of Ridermanuals. 1 through 13. Used copies infair condition. Cash. H. P. Boone. 18Melia St., St. Augustine, Pia.

URGENTLY NEEDED -A modern tubetester, preferably Radlotechnic Lab tes-ter but will accept other rood make.Also want 701.7 GT/G and 50Y6T/Gtubes. Brill Radio Service, 1920 CircleCt., Chicago Heights. III.

FOR SALE -International Morse codecourse records. The Linguaphone courseconsists of 5 double-faced 10" recordswith Inst. book & album. Used little.R. E. Hartman, Dakota, 111.

WILL TRADE -Triplett #321 3" milliam-meter 0-5 scale, practically new, forany make milliammeter with 0-1 scalein good condition & same size. Also willtrade one Thordarson T54F55 2.5v c.t.filament transformer, brand new, forwhat have you? C. P. Young, 936 JolietSt.. New Orleans 18, La.WANTED-Echophone EC -1 or SkyBuddy for soldier studying advancedcommunications. Cash. Sgt. Jack Rickel,Hq. Co.. IRTC, Camp Robinson. Ark.

WANTED -Will buy used console (ornew) cabinets in which old radios canbe Installed. What have you. John A.Gruenigen, Central Y.M.C.A., Harris-burg, Pa.

FOR SALE -Precision #500 tube check-er in perfect condition with rotary illu-minated chart. Also small lot of misc.parts such as small meters, Roller -Smithradio freq. meter, sockets, controls.transformers, etc. Write for list. ArthurW. Klein, 6708 Sixth Ave., Brooklyn,N. Y.WANTED -Used sig. generator coveringfrom 100 kc. to 120 mc. S. J. Elvin.City Radio Shop, Thomasville, Ala.

FOR SALE -#18 Hickok all -wave signalgenerator with built-in DB-level outputmeter. In perfect condition. $05. Pvt.J. M. Novak, Co. I, 804th S.T.R., CampCrowder. Mo.

WANTED -Pocket size V -O -M .0 to5,000 volts in 8 ranges, AC -DC 0 to1,000. D.C. milliamperes 0 to 40,000ohms. Jack M. Malone, 525 E. MainSt., Eaton. Ohio.FOR SALE -Radio City comb. tester,millimeter, plug-in analyzer #802-A.Brand new condition. Also Radio Citypocket multimeter #456, brand new con-dition. Also have misc. parts & tubes.A. Gilbert, 878 Bryant Ave., Bronx, NewYork 59, N. Y.

WANTED -A milliammeter. The RadioShop, Pardon Ave., Box B, Plermont,N. Y.

IMPORTANT NOTICE!We discourage offers to buy or sell

anything beyond the O.P.A. ceilingprices, and will not knowInnly accentsuch ads for the Sprague Trading Post.

URGENTLY NEEDED - Volt -ohmmeter0-10 megs. 0-1000v AC -DC. Ed II.Rogers, P.O. Box 273-3, Hawthorne,Nevada.

WANTED -902 CR tube (2"), also 1t4to 117 volt tube tester transformer inA-1 shape. Cash. Richard Blair, 710Clark St., Misssoula, Mont.

WANTED -New or good used mica andvariable condensers, resistors. 1LE3,1G4, 1T5, GT tube sockets; 500.000 ohmpot.; coils; chokes or what have you?State price. L. A. Kirk, Box 511, Col-fax. Calif.

FOR SALE -12" Jensen dynamic speaker,separate excitation included; RCA 100-Amagnetic speaker; Western Electric #540magnetic speaker; Amberican 2 -buttoncarbon mike. Excellent condition. Ed-mund Mc)). Bendhelm, 22-33 - 31st St.,Astoria, L. I., New York.

FOR SALE -One C13 Janette rotary con-verter, 115v 4.2 amp. D.C.; 110v, 80cy. AC. 300 watts, 3800 r.p.m. incl.built-in filter, $35 f.o.b. Sven Steiner.1 Cabrini Blvd.. New York 33. N. Y.

WILL TRADE one Delco 32v superhetreceiver #3210 using 6A7, 2-6D8, 85,and 2-48 in A-1 condition for good AC -DC table model or what have you? Alsohave Rider's manual #9 for sale. D. M.Decker, Deckerville, Mich.

FOR SALE -Jackson #540 sig. gener-ator, $40; Jackson #560 multimeter &tube tester, $40; Jackson #580 oscillo-scope, 3", $60; Philco dynamic audioanalyzer, $25; R.C.P. tube tester. $30;Rider's manuals (brand new) vol. 1thou 5 (abridged) and vols. 3 thru 13.$125; Approx 200 tubes. 70% are new,at least 60 different types incl. 35Z5.35L8, 3Q5's etc. -take all or none @50c ea. Instruments complete withtubes, instructions, and charts. Writefor list. Will dell complete shop for$525. Don Sevin, 107 East E St.,McCook. Nebr.

WANTED FOR CASH -Jackson #642multimeter, also signal tracer, amplifierCarron or similar with graduated scaleto show exact frequency of signal. L. W.Smeltzer, 3721 Legation St., N.W.,Washington, D. C.

WANTED-VoItoinnmeter; AC -DC mul-titester & tube tester; set analyzer and

tube tester combination. Fred Kroner,8116 Quincy Ave., Cleveland. Ohio.

WANTED -Short-wave receiver, batteryor AC; 2 - I -F 1500 kc. transformers:1 Meissner B.F.O. transformer; set ofHammarlund short-wave coils. 2-140mint. variable condensers and other radioparts. What have you. Joseph Harter,Sweet Corner Road, Fairport, N. Y.

FOR SALE -Two Genemotors, 3.50v (4)

100 M. $5 ea.: Philco wireless stationsetter #014. $12; two Carter 6v units(need diaphragms), $5 ea.; two 6v

Western Electric units (need dia-phragms)., $8 ea.; 200 auto radio platescompl. with fittings. $10. Will swap

12SA7's or 12SQ7's for 351.6's or

501,6's. Al Budin, 11211 Superior Ave.,Cleveland 8. Ohio.

WANTED FOR CASH -Precision #832

multimeter, Supreme #542. Superior#1220. or Simpson #235. Meter mustbe good. Felix Cartoon°, 560 WytheAve.. Brooklyn, N. Y.

WANTED-Voltohmyst or voltohmyst. Jr.for cash and a few hard -to -get tubesfor a bonus. Walt's Radio Shop. 11449

L.B. Blvd., Lynwood, Calif.

WANTED -Oone 1

or12SK7GT, oneFOR 12AC8,ASHand one 12SQ7 or12SR6GT. Radio Service, Box 322, Syra-cuse, Kansas.

WANTED -Low priced short-wave set,

any make. Geo. Shafer, 2240 E. 24th

St.. Granite CitY,WANTED -One Cetron CE -T gee filledcaesium phto cell: John W.

NButler.

424 Mansfield St., Belvidere, N. J.

FOR SALE -Complete tube stock, morethan 60% types in heavy demand. newin sealed cartons. Also input, output &Power transformers, crystal cartridges.wire -wound and carbon resistors, con-

densers. etc. All new stock. Sendstamped, addressed envelope for list.Radio Electronic Co., Hudson. Wisc.

WILL SWAP cathode ray tube #906(never used) for camera and pay cashdifference. Also have a Triplett 327 0-1Ma. for What have youWilliams(

trade.Miller. 893 Union Ave., Provi-

dence. R. I.WANTED -Oscillator or ohmmeter forradio work. Robert Goodlett, 1729 Dun-can St., Louisville. Ky.WANTED -Two 6V6 tubes and one351.6. Cash. Glenn L. Thompson. 3607%Lake Park Ave., Chicago 15, 111.

FOR SALE -Precision 832 multi -rangetester with simplified rotary 31 rangeselection and extra large 3%" meter.Used very little. L. R. Couch. Jr..2139 Greenwood St., Savannah, Ga.

YOUR OWN AD RUN FREE!This is Sprague's special wartime advertising service to help radio

man get needed parts and equipment, or dispose of radio materialsthey do not need. Send your ad today. Write PLAINLY -hold it to 40words or less. Due to the large number received, ads may be delayeda month or two, but will be published as rapidly as possible.

Different Trading Post ads appear monthly in Radio Retailing -Today,Radio Service -Dealer, Service, Radio News, and Radio -Craft. Spraguereserves the right to reject ads which do not fit in with the spirit ofthis service.

HARRY KALKER, Sales Manager.

Dept. RSD-74, SPRAGUE PRODUCTS CO., North Adams, Mass.

SPRAGUE CONDENSERSKOOLOHM RESISTORS

Obviously, Sprague cannot assume any responsibility, or guarantee goods, services, etc.. which might be exchanged through the above advertisements

July. 1944 3 I

OF-OPPNEED

A

SAAVAIVIA

LY

SERVIGONSERVICE

byFRANK FAX

Book matches, imprinted with yourname, are one of the best and mosteconomical ways to advertise yourbusiness.

Sylvania has prepared a new style ofbook match for your use.

Supplied to you for cost, with yourname handsomely imprinted:

1,000 . . $3.25 5,000 . . $14.902,500.. 7.50 7,500.. 22.40

Plus 40 cents per thousand Federal Tax.Orders under 7,500 are shipped FOBShipping Point; over 7,500, FOB youraddress.

Order from your local Sylvania dis-tributor, or send your order to FrankFax, Sylvania, Emporium, Pa.

SYLVANIAELECTRIC PRODUCTS INC.

RADIO DIVISION

Your Oscillograph(Continued from page 15)

is to a negative supply, some point onR1 can be made a point of zero po-tential. Consequently, a direct cur-rent voltage is available when ap-plied to the grid V2 to cause the di-rect current plate voltage of V2 tovary, and therefore, to cause directcurrent positioning. The resistor R4comprises the plate load for the de-flection amplifier V2, while R5 and Rereturned to a high negative potentialprovide direct current voltage divi-sion to cause point P to be at zeropotential with respect to ground. Ca-pacitance C1 is provided to reduce theattentuation of the alternating cur-rent signal component. Since R5 isnecessarily high in value, the timeconstant of C1 and R5 will not atten-uate the low frequencies appreciably.The chief advantage of direct cur-rent positioning is that of eliminat-ing the lag usually associated withalternating c u r r en t positioning,when good low frequency response ismaintained.

Alternating current position, as il-lustrated in Figure 16, is used forapplications where the lag is not seri-ous, or when direct current connec-tion is not desirable.

The above mentioned lag or "elec-trical backlash" is caused by thetime required for the capacitance C1and C2 to establish a steady directcurrent potential at plates D1 and D2after position control potentiometersR1 and R2 have been adjusted tosome new value. This time is neces-sitated by the large time constantsC1R3 and C2R4. High values of re-sistance are necessary at R3 and R4to maintain a high input impedanceat the deflection plates and to insuregood low frequency response in thedeflection plate coupling circuit.

With the Editor(Continued from page 14)

of OPA gas rationing, you are en-titled to "B" rations for occupa-tional use in repairing non -port-able radio sets, P -A systems, etc.,and you are entitled to "C" ra-tions if your work includes re-

pairing government owned radiosor monitors.

Post War Outlook(Continued from page 18)

facturer in the business has sharply in-creased his capacity during the war.Therefore, we know that the 'SellersMarket' won't last long and that wesoon will have to roll -up our sleeves anddo some good old-fashioned sellingagain."

This second school goes on to say,"We know that selling has been easyduring the past few years-we haven'treally had any tough selling since 1938.We think that sales will be large inthe post war market, but only for thosewho have prepared to make them large.

"Now we know that we could savesome money on advertising and sales-men expense during the early alloca-tion of production period-but it's dur-ing that time we are going to build thenucleus of the selling organization wewill later require. We are going to

Industrial P -A Installations AreAlready Booming. (Photo courtesyof Lafayette Radio Corp., Chicago).

give a little at the start to make agood return later on.

"We are going to pay out some com-missions at the start which we couldsave-but we can pay them and still


ANHIP/SPENJABLEA/D TO THESERVICE MAN

Here's theBook You'veBeen Waiting

for!Contains all

available ServiceData on all

FADA Receivers$ I 00

I PlusPostage

end for it Now!

FADA OF NEW YORK928 BROADWAY NEW YORK, N.YLarge Stock of Replacement Parts & Cabinets


The Famous Three!Tinker, Evers and Chance were famous for Stamina,

Efficiency and Fine Performance. So are all RACONProducts!

There's a RACON speaker, horn and driving unit forevery conceivable sound distribution application. OnlyRACON can supply, when needed, another famous

three -in -one combination - Weatherproof, Stormproof,Acoustic Material which is impervious to any weather

condition and prevents resonant effects.Now that industrial war plants can obtain sound in-stallations, remember that RACON's should be used

to afford peak efficiency.

MARINE HORN RE-ENTRANT TRUMPETS P.M. UNITS

MARINE HORN SPEAKERS, approved by the U. S. CoastGuard, may be used as both speaker and microphone.Available in several sizes.RE-ENTRANT TRUMPETS, compact, of the double re-en-trant type, afford long air -column in small space; de-liver highly concentrated sound over long distances.P.M. HORN UNITS are available in operating capacitiesof 5 to 50 watts.

RACON ELECTRIC CO. 52 E. 19th ST., N. Y.

BACONJuly, 1944 33

Model 504,4 4

Tube and Set Tester

Model 542Pocket Multimeter

Supreme"Hairline Accuracy"

Meter

IN TEST EQUIPMENT?Military secrecy precludes our

answering that now. But radicalnew developments in testingtechniques have been and arebeing perfected. Because ofthese important advances, whenVictory comes your NEWSupreme Test Equipment will be,more than ever, "Supreme ByComparison."

SUPREME INSTRUMENTS CORP.Greenwood, Mi.., U. S. A.

A New High Speed Circuit Tester(Continued from page 12)

swing in either direction. Audiofrequencies between zero and 30cycles will be indicated by their

Normal adjustment of indicator. If nod -c, a -c or a -f is present, the shadowangle will not change. It will register

as low as a half -volt.

Negative d -c is indicated by partial orcomplete closing of shadow angle.

Positive d -c causes increased opening ofshadow angle. Time to return to nor-

mal shows relative amount d -c.

A -c or a -f will produce deflection inpositive and negative directions, andcan be identified by medium light in-

tensity over the deflection area.

Flickering in two directions shows irreg-ular a -f peaks; in one direction, inter-

rupted or pulsating d -c.

Figs. 2 -A -B -C -D -E above

flickering and amplitude repetition.Speech and music can be defined

by discontinuous flickering which initself opens the way for using thisindicator as an audio signal tracingdevice.

For high speed testing the oldscrew driver method can be revived,but this time the brutal part of it isovercome because of the high re-sistance input of the electronic indi-cator. You can quickly check for thepresence of voltages where they be-long or for the presence of undesiredvoltages, hum or signals where theydo not belong.

In practical application it is easyto detect a leaky coupling capacitorwith an internal leakage resistancearound 1 or 2 megohms by observ-ing polarity indications while prob-ing at the grid side of the capacitor.

After the above leakage test hasbeen made, a further check on coup-ling capacitors is a simple matter.By connecting a small capacitor, sayof about .002 infd. in series with theprobe the d.c. plate voltage will beblocked, permitting only A.C. or au-dio voltage to influence the Indica-tor. With this adaptation the samea.f. indication should be apparent atboth ends of the capacitor; if it isnot, the capacitor may be open orgrounded and consequently useless.

Should your problem involve inter-mittent output, the indicator asmodified above, can be used as a highimpedance monitor to test for theerratic action of a capacitor over aperiod of time sufficient to producesuch behavior. Once connections aremade for monitoring the signalthrough a suspicious part of any de-fective device it is not necessary totouch anything until the normalcourse of events have proven or dis-proven any questionable perform-ance. Thus the problem of contactshock -curing poor internal capacitorconnections is eliminated.

+ D.C.MEDIUM VOLTAGE

+ D.C.HIGH VOLTAGE(SLOW RETURN)

NO CHANGE(GROUNDED)

NO CHANGE(GROUNDED)

LOW VOLTAGE

A.F.LOW VOLTAGE

(FLICKERING A.C.)

+ D.C.LOW VOLTAGE

(INSTANT RETURN)

34

Figure 3


TEAROUT

PirbANDMAILNOW

Subscribe NOW to

radioservice

dealerApproximately 1000 more newsubscribers can be added to ourlists under present paper restrictions.

Old subscribers, extend your sub-

scription today to make sure youdon't miss out!

RADIO SERVICE DEALER(Remit by Check or Money Order. We cannot assume responsibility for cash sent thru mails).

COWAN PUBLISHING CORP.342 Madison Ave., New York 17, N. Y.

Sirs: Here is my check (or money order) for $ .Enter my subscription order for the next issues.

The information given below is accurate. If my subscription is rejected I expect an immediate refund in full.

Subscription Price: 12 issues $2.-24 issues $3. Canadian and Foreign subscription are $3 annually.

Name (print carefully)

Address City State

Firm Name Year Est. 19

OWNERI am {DEP'T MGR.

EMPLOYEE

If some other classification or occupation, state it on the line below:1=1

Please check whether firm is

Radio Dealer Radio Wholesaler Hardware Store Radio Service Organization Music Store Electrical Appliance Dealer

Automotive Store Any other classification (State it)

July, 1944 35

Post War Outlook(Continued from page 32)

make a fair profit. By paying themwe are going to have trained peopleready who will be the foundation of thereally large radio and appliance busi-ness we expect to do for the manyyears to come.

"We aren't going to wait and sud-denly wake up some day to find thatnow that we can get plenty of mer-chandise we don't have an organizationto sell it. And-to find that our com-petitors have all the good men andthat we are many months behind inour advertising, promotion and sellingcampaigns. If we were to wait, itmight take us years to catch up. We

Ag EXCEPTIONAL PERFORMANCEINSULINE has been awarded the Army -Navy "E" for exceptionalperformance in the production of Radio -Electronic Products.We are resolved that this honor shall be answered with stepped -up production . . . with new records of exceptional performanceworthy of the trust placed in us by the Armed Forces.

-edalfef .4444ef Though engaged in vital war work,Insuline is looking ahead. We aregearing our organization for the post-war requirements of the Radio -Elec-tronics Industry.Write for 48 -page Catalogue.

nsuunCORPORATION OF AMERICA

INSULINE BUILDING LONG ISLAND CITY, N.Y.

TYPES OF

SCREW DRIVERS3 and

SMALL TOOLSMeans

VACO

Amberyl

Has the Tool You

Need . . . To Suit

the Job It's

Needed For

VACO PRODUCTS CO.309 E. ONTARIO STREET CHICAGO 11, ILL.

Canadian Branch Warehouse: 560 King St., W., Toronto 2, Ont.

prefer to have our competitors do thecatching up."

Many retailers are today makingcomplete plans for their post war radioand appliance departments. The en-larged department floor space plans arealready laid out. Merchandising pro-grams have been developed. Arrange-ments have been made for departmentheads who are to start work severalmonths in advance of the time produc-tion will begin. Tentative arrange-ments have been made with salesmen-and so on.

There will be a big normal marketfor post war products. But it can bemade bigger by creating a bigger de-mand. And that is what salesmen, ad-vertising and sales promotion can ac-complish.

Technical Service Portfolio(Continued from page 21)

fixed -capacitance series padder intuned L -C circuits in radio receivers,r.f. oscillators, and electronic testinstruments (See Figure 1).

In order to prevent broadening ofthe selectivity curve of such a cir-

SERIESIPADDER

TUNINGCAPACITOR

FIG.1

cuit, it is necessary that the equiva-lent series resistance of the paddercondenser be very low. Another man-ner of stating this requirement is bysaying that the capacitor Q mustbe very high. Heretofore, mica con-densers have met this requirementwith no difficulty. However, the low -Q characteristic of the substitutepaper condenser renders that unittotally unsuitable for use in high -frequency tuned circuits.

Certain receiver circuits in whichautomatic volume control is incor-porated employ a fixed condenser inseries with the grounded end of theinductor of a tuned circuit, as shownin Figure 2. Here, as in the first

TO A.V.C.CIRCUIT

FIG.2

case, the fixed capacitor is effectivelyconnected in series with the coil andthe variable condenser and will re-duce the circuit selectivity unless thefixed unit possesses low equivalentseries resistance. Present substitutepaper condensers do not exhibit asufficiently high Q to replace micacapacitors in this application.



He won't dodge this-

Don't you dodge this!

The kid'II be right there when hisC. 0. finally gives the signal . . .

There'll be no time to think ofbetter things to do with his life. THEKID'S IN IT FOR KEEPS-giving allhe's got, now!

We've got to do the same. This isthe time for us to throw in everythingwe've got.

This is the time to dig out thatextra hundred bucks and spend itfor Invasion Bonds.

Or make it $200. Or $1000. Or$1,000,000 if you can. There's noceiling on this one!

The 5th War Loan is the biggest,the most vitally important financialeffort of this whole War!

"WAR LOAN

viCriki7

gocANeliravel,/- BUY MORE THAN BEFORE

RADIO SERVICE DEALER

This is an official U. S. Treasury advertisement-prepared under the auspices of Treasury Department and War Advertising Council

July, 1944 37

INTELLIGENTLY

flYEDILT..The Lafayette Radio Corp. organization,built soundly over a period of 25 years,functions in two "key" shipping centers- Atlanta and Chicago. Yes, we main-tain tremendous stocks of radio andelectronic components and equipment.But, equally important, there are "brains"to go with them. Our men are truly appre-ciative of what you are up against thesedays ...whether you're a giant of indus-try, the little service man around thecorner, or represent a military agencyor training school.

Because we are well versed in all fieldsutilizing electronics, your orders are han-dled intelligently. At our fingertips is com-plete data on shipping routes, priorities,effective substitutes... all things a pur-chasing agent wants to know.Write,wire,telephone or teletype - get to know thesuperior service of Lafayette Radio Corp.

NEW- 8 -Page CIRCULAR, listing merchan-dise available for immediate delivery, willbe rushed to you on request. All items aresubject to prior sale. Write or wire Dept. h.7

S. We specialize in equipment forlaboratory and experimental use. Suchequipment built to your specifications if youdesire.

901 W. Jackson Blvd. 265 Peachtree StreetCHICAGO 7, ILLINOIS ATLANTA 3, GEORGIA

Technical Service Portfolio(Continued from page 36)

Similar tuned or padded circuitscontaining only fixed capacitors (Fig-ure 3) are employed occasionally atthe high Q values imperative in r.f.circuits. Tuned audio amplifier plateand grid tanks, a.f. wave filters, and

FIXEDIRON CORE

VARIABLEPOWDERED -IRON

CORE

FIXED -TUNE FIG.3 VARIABLE

tone -control circuits are examples ofthis application in which the newsubstitute paper condensers are en-tirely satisfactory, provided theyshow low power factor at 1000 c.p.s.

The paper units can be used, also,for by-passing in r.f. circuits oper-ating at frequencies up to the capa-citor resonant point, and as far be-yond as the ratio of reactance toby -passed -circuit resistance will per-mit. They are satisfactory for by-passing in audio -frequency circuits.

Figure 4 shows an ordinary super-heterodyne receiver circuit in whichpermissible positions for substitutepaper capacitors have been indicated.

DISCussion(Continued from page 22)

"Fats," and this release is by way of amemorial to his undying music.

Eight tunes, including a new impro-visational version of "HoneysuckleRose," "Fats" most famous composi-tion. "Your Feet's Too Big" and"Holt Tight" are humorous vocals;"Ain't Misbehavin' " is piano. "TheJoint is Jumpin' " is a fast tune and"Two Sleepy People" sounds like itreads. Then there's "I Can't Give YouAnything But Love, Baby" in a duetwith Una Mae Carlisle, and "The MinorDrag"-one of Waller's first discs fea-turing "Fats" Waller and his Buddies-his original band. This album is amust for anybody's jazz department.

Wayne King and his Orchestra playboth sides of record 20-1587. "Amor-Beguine" (with vocal refrain) and"I'm Gettin' Mightly Lonesome forYou" (vocal by the Three Barries).

"Amor" is played with feeling, butno "schmalz." The other number is anappropriate tune for these days, andthe Three Barries do a good job on it.

John Charles Thomas in Concert Fa-vorites (Album M-966). A three -pock-et, 10 -inch selection of six ingenuoussongs which have become staples in theconcert repertory: "Drink to Me OnlyWith Thine Eyes"; "In the Gloaming";"Your Presence"; "Fulfillment"; "Come

Aerovox makes an exceptionally widechoice of heavy-duty and special -service ca-pacitors, as distinguished from the usualradio capacitors in the general catalog.

Today these top -grade capacitors are virtu-ally drafted for the requirements of ourarmed forces. Also, they service the avia-tion, police -radio, broadcasting and otherhigh -priority requirements. However, to-

morrow those heavy-duty, special -servicecapacitors will be available to you also, foruse in your electronic and industrial assem-blies and maintenance. Aerovox is alreadymobilized for the forthcoming Electronic Age.And Areovox is helping you find yourplace in the greatly expanded opportunitiesof tomorrow.

See Our Jobber . . .Ask him for a free subscription to the monthlyAerovox Research Worker. Ask for latest cata-log. And order your capacitor requirements fromhim.

INDIVIDUALLY TESTED

AEROVOX CORP., NEW BEDFORD, MASS., U. S. A.

In Canada: AEROVOX CANADA LTD., HAMILTON, ONT.

Export:13 E.40 ST.. NEW YORK 16, N.Y.- Cable: 'ARLAB'

AND

ELECTRONIC

DEVICES

BURSTEIN-APPLEBEE CO1012.1914 McGee St. Kansas City 6, Missouri


to Me In My Dreams"; " 'Tis the Day."Carroll Hollister is at the piano.

In all six songs, ranging as they dothrough every emotion, the natural andartistic qualities of this American bari-tone's voice are coupled with excep-tionally fine diction. Each song is anentity, a miniature masterpiece of vocalartistry. . . . The man just loves tosing, and admits it: "I'm not happyunless I am about to sing, singing, orfinishing a sing." . . .

Bluebird 30-0826 is shared by CharlieBarnet and his Orchestra and AlvinoRey's group. Barnet, with the capableassistance of baritone Bob Carroll,plays "I'll Remember April," while Al -vino Rey and Yvonne King swingthrough the melody and lyrics of "Don'tTake Your Love From Me."

Barnet's band is augmented by a vio-lin section giving a smooth setting toCarroll's voice. The tune on the rec-ord flipover is tailor-made for the`young love' department, and Alvino andYvonne are their usual perfect matchin it.

Bluebird 34-0715 gives us Yank Ra-chell, blues -singing "Bye Bye Blues"and "Katy Lee Blues." Original blueswas 'shouted" rather than sung, andYank has clung to that first blues man-ner. The accompaniment is not somusical as it is rhythmical. Both sidesof this Bluebird Race record are tra-ditional blues in the twelve bar pattern,as originally played.

Sidelights on Plant BroadcastingPsychologists note that the music pro-

grams played for war workers is creatinga desire for classical music among peoplewho never heard the works of the mastersbefore. Various plants report employeesrequesting repeats of Beethoven, Bach, andBrahms. At one plant in the middle westan employee dropped a note in the requestbox asking the director to "play thatBronze Lullaby and Clair de Goon again."

Certain plants equipped with RCA in-ternal broadcasting systems report thatsoft, sweet music is played in the companyinfirmary waiting rooms to soothe nervouspatients. Nurses report that the musiccauses the patients to relax, thus aidingmedical diagnosis and treatment.

A wartime substitute for the "singingmessenger boy" has been devised by FredHomer, director of plant broadcasting atthe RCA Victor Camden plant. A gleeclub octet harmonizes "Happy Birthday"over the plant broadcasting system priorto announcing birthdays.

New Coil -Winding and RFResonance Calculator

Allied Radio Corporation, Chicago,announces the release of a new slide -rule type rapid calculator, permit-ting quick and accurate determina-tion of inductance, capacitance, andfrequency components of series orparallel tuned RF circuits as well asinductance, turns - per - inch, wiretype, wire size, coil diameter andcoil length for single layer -woundsolonoid type RF coils. All values,in either case, are found with asingle setting of the slide and areextremely accurate. Price 25c.

F YOU CANNOT REPLACE RADIO PARTSREPAIR THEM WITH111PRODUCTS

WALTERL. SCI4011

CO.

acts of

WALSCOPRODUCTS

for CommunicationEquipment

anufacturers,

Laboratories,Schools

and Radio Repair Men

9306 SantaMonica

Blva., BeverlyHills,

Calif.

Dept. RS -1

Walsco RADIO CHEMICALS Speaker Cements Cements For Plastics Special Adhesives Contact Cleaning Fluids Noise Eliminating Compounds Radio Lubricants

ifWalsco RADIO HARDWARE Dial and Knob Springs Trimounts, Set Screws

Walsco CABLES, BELTS

Of course-we ore concentrating ourefforts on war production-but notfor a second are we neglecting theRADIO SERVICEMEN who require somany WALSCO RADIO PRODUCTSto keep the radios of their customersin perfect working order. Write to.day for WALSCO Catalogue No. 112,giving complete information aboutWALSCO PRODUCTS.

Today, front line performance thattakes grueling punishment in stride-Tomorrow, the same unsurpassedperformance for civilian use. In casedelivery is slow, remember the armedforces get first preference.Watch Cin-audagraph Speakers After Victory!

Cinaudagraph speakers,3911 5. Michigan Ave., Chicago

,/Vo ,FirteA, .9Aecaet, ,Wade in allite 611/eyeld

July, 1944 39

Available fromlocal dealers orby writing fac-tory direct.

YOURS'FOR THEASIl/N6011111111/8ow

wite -..,,

`VW/uxmnu

e :÷..*

104011300

UNIVERSALSTROBOSCOPEThis handy phonograph turntable speed indicator,complete with instructive folder, is now availablegratis to all phonograph and recorder ownersthrough their local dealers and jobbers. As arecorder aid the Universal Stroboscope will assistin maintaining pre-war quality of recording andreproducing equipment in true pitch and tempo.Universal Microphone Co., pioneer manufacturersof microphones and home recording componentsas well as Professional Recording Studio Equip-ment, takes this means of rendering a service tothe owners of phonograph and recording equip-ment. After victory is ours-dealer shelves willagain stock the many new Universal recordingcomponents you have been waiting for.

UNIVERSALMICROPHONE CO.

INGLEWOOD, CALIFORNIA

ROLLING ON TO

* Clarostat continues to be engaged 100%in the most important lob of all-winning thewar-on land, sea and in the air.

But after victory has been won, Clarostatpromises the trade-servicemen, Jobbers andothers-that Clarostat products for initial andreplacement uses alike, will once more begenerally available for peacetime pursuits.Meanwhile. let's keep 'em rolling!

FOSTAT

E'LNAVY

CURDS/AT MFG. CC.. Ice 285/ R. Is St ,8reokIyiktt

Permatone Needles Sell WellBacked by an extensive promotional

campaign in the trade press and featuringwindow displays at record dealers, theGarod Radio Corporation's campaign forits Permatone Phono Needles is at "flood -stage" now, it was announced this week bySales Manager Lou Silver. Leading re-cording artists are highlighted in the seriessoon to be released.

In addition to full scale promotion forthe three types of Permatone PhonoNeedles, now standard best sellers in thetrade, Garod has also introduced a newrecording stylus retailing for $.50.

Definitely committed to a policy of sell-ing direct to distributors, Garod is sparingno effort in its current advertising seriesto promote the best interests of the exclu-sive jobbers it has set up in its sellingterritories. This "exclusive -with -distribu-tors" policy, long a feature of Garod mer-chandising, will continue into the post-warperiod, Silver added.

In addition, attractive packaging in threecolors is proving its worth, as sales recordsof distributors testify. The Garod Stand-ard Permatone Phono Needles sell for $.50and play 1500 recordings; the SuperiorModel retails at $1.00 and plays 4000 discs,while the DeLuxe Model is priced at $1.50and plays 7000 records.

Featuring an exclusive "filter -trap"which absorbs shock and reduces scratchesto an imperceptible degree, it has a highlypolished, tempered surface. The velvet -smooth non -corrosive tip fits perfectly intothe groove of the record and guaranteesexcellent fidelity of tone, even while pro-tecting the surface.

Three Socket WrenchesCombined in One

Having the same approximate dimen-sions as a single socket wrench and withvery little additional weight, the new TescoMulti -Socket Wrench automatically ac-commodates #10 standard, #12 standard,1/4" standard and light, and 5/16" lighthexagon nuts. Merely by pressing thewrench over any of the three sizes of nutsautomatically selects the proper nestedhexagonal tube suited to that particularnut.

By no means a "gadget," the TescoSocket Wrench is specifically designed forheavy duty service, making it unexcelledfor factory production or servicing workof any kind. Its design is such that anystress incident to turning a nut is trans-ferred to the outer hardened -steel casing.It is also designed to provide a clearancethrough the barrel for studs up to 51/2"length, thus making it ideal for turningnuts on long studs. Both handle and barrelhave moulded insulation capable of withstanding a dielectric test for one minute at5,000 volts RMS.

Descriptive literature will gladly be senton request to the manufacturer, The East-ern Specialty Company, 3617-19 North 8thSt., Philadelphia, Pa.

National Carbon Sales SetupA new sales set-up under which all

company products will be handlednationally from seven divisional officesis being installed by National CarbonCompany, Inc. While the new systemgives the division heads responsibilityfor sales of all company products,"Eveready" dealers will be served bymen who give their whole time to it.

Aerovox Corporation .Agency: Austin Lescarboura & StaffB rach Mfg. Co., L. S.Agency: United Adv. Co.B urstein-Applebee Co.Agency: Frank E. Whalen CoCinaudagraph Speakers, Inc. ... 39Agency: Michael F. MagyerClarostat Mfg. Co. 40Agency: Austin Lescarboura & StaffElectro-Voice Mfg. Co. 24Agency; Shappe-Wilkes, Inc.Fada of New York 32Agency: Sternfield-Godley, Inc.Calvin Mfg. Corporation ...3rd CoverAgency: Gourfain-Cobb, Inc.

General Electric Co. 3Agency: N. W. Ayer & Son, Inc.Hallicrafters Co., The 29Agency: Burton Browne, Inc.Insuline Corp. of America 36Agency: H. I. Gold, AdvertisingInternational Resistance Co. 8Agency: The Lavenson BureauKen-Rad Tube & Lamp Corp, 28Agency: Allen, Heaton & McDonald, Inc.Lafayette Radio Corp. 38Agency; ShapPe-Wilkes,Mallory & Co., Inc., P. R. .2nd CoverAgency: Western Advertising AgencyMeck Industries, John 7Agency: The Aitkin-Kynett Co.Meissner Mfg. Co. 27Agency: Gardner Advertising Co.Racon Electric Co. 33Agency: Leon Allen, AdvertisingRadio Corporation of America .5, 25Agency: Kenyon & Eckhardt, Inc.Raytheon Production Corp., 4th CoverAgency: Burton Browne, Inc.Rider, John F. 30Agency: Lansford F. King AdvertisingSchott Co., Walter L. 39Agency: Barton A. StebbinsSprague Products Co. 31Agency: The Harry P. Bridge Co.Standard Transformer Corp. 30Agency: Burnet -Kuhn Adv. Co.Supreme Instruments Corp. 34Agency: O'Callaghan Adv. Agency, Inc.Sylvania Electric Products, Inc. . 32Agency: Arthur Kudner, Inc.United States Treas. Dept. 37Universal Microphone Co. Ltd. .1, 40Agency: Ralpe L. Power, Achitg.Utah Radio Prods. Co. 10Agency: The Buchen Co.Vaco Products Corp. 36Agency: Duane WanamakerWard Products Corp. 2Agency: Burton Browne, Inc.

38

26

38

$1.00 PAID FOR SHOP NOTESWrite up any "kinks" or "tricks -of -the -

trade in radio servicing that you havediscovered. We will pay $1 in DefenseStamps for such previously unpublish-ed "SHOP NOTES" found acceptable.Send your data to "Shop Notes Editor,"RADIO SERVICE DEALER, 342 MadisonAve., New York 17, N. Y. Unusedmanuscripts cannot be returned unlessaccompanied by stamped and addressedreturn envelope.


IVIIRACI l'qY *

OF SCIENcE?

90/ Bero/Butnone that replace

SOLIDSELLING

Radio'CAVALRY GUIDON SETDeveloped and built byMotorola Engineers in co-operation with Engineers ofthe U. S. Army Signal Corps.

Scientific and technological prog-ress have been kicked forward at atremendously accelerated pace. Towin wars there must be miracles ofdevelopment and production. How-ever, let us not lose sight of thesomewhat slower tempo which pre-vails under normal competitive sell-ing conditions.

Check the facts: 1. There will bea tremendously swollen consumerdemand. 2. With their accumulatedwar savings, people will be ready,

willing, able and anxious to buy.But, if past experience can be

trusted at all, Mr. and Mrs. Americawill be very careful and twice ascagey about what they buy and wherethey buy it. They will have to be sold.

Manufacturers and retailers alikeshould take Mr. Miracleman off thepayroll now. He always lookspretty in pictures, but he wilts fastwhen Mr. Solid Selling takes off hiscoat, rolls up his sleeves and goesto work.

GALVIN MFG. CORPORATION CHICAGO 51

RadiaF -M RADIO * PHONOGRAPHS * RADAR * TELEVISION * F -M POLICE RADIO * MILITARY RADIO COMMUNICATIONS

Electronic tube developments are being refined in thecrucible of war at an amazing rate. Raytheon engi-neers are originating new designs - manufacturingtechniques are greatly stepped up, and many newapplications for electronic tubes have been found -applications that will contribute much to the postwarera of electronics.

Raytheon's research and great wartime productionrecord will doubly protect the tube requirements of

All Four Raytheon Divisions Have BeenAwarded Army -Navy "E" Plus Stars

postwar radio and industrial electronic equipmentmanufacturers. As before the war, the postwarRaytheon tubes will reflect the best engineering forall applications, as well as all the "Plus -Extra" per-formance qualities that have been synonymous withthe name of Raytheon throughout the years.

Raytheon Production CorporationNewton, Massachusetts Los Angeles 'Stew York

Chicago Atlanta

R N7K9,4 Fickeere,

RADIO AND ELECTRONiC TUBESDEVOTED TO RESEARCH AND MANUFACTURE OF TUBES FOR THE NEW ERA OF ELECTRONICS

nen radio opportunities - radio lelephon, nen llit!h speed ... · who can use the figures to guide...

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