dual 14 watt hi-fi - vintage vacuum...

general description

GENERAL

The EICO Model HF-81 is a complete high fidelity stereophonic control center and a pair of 14watt amplifiers, allon one chassis. With it you can select preamplify, andcontrol accurately any stereophonic source (tape, discs, orbroadcasts) and feed it through the self-contained dual 14watt amplifiers to a stereo pair of speaker systems. Whenyou playa monophonic source, the 14 watts available perchanneIadds up to a total of 28 watts for your two speakersystems. If you desire, both amplifiers can be connectedin parallel and driven byone preampIifier-control sectionwhile the other preampl ifier-control section is free to drivean external power amplifier. In this way your old amplifier can be put to use in a stereophonic system. Construction is of the "low silhouette" type that permits you todispense with cabinetry if desired.

FEATURES

1. Separate low level input in each channel for mag.phono, tape head, and microphone. Circuitry carefullydesigned to provide the high gain required by tape headsand high quality, lowoutput mag. cartridges without humand noise problems. A front panel switch permits choiceof the proper NARTB tape head equalization for either7 1/2 & 15 or 3 3/4ips tape speeds.

2. Separate high level inputs for AM, FM, and FMMultiplex. Also two auxiliary A inputs (one in each

1

MODEL HF-81

DUAL 14 WATT HI-FI

STEREO AMp·PREAMP

channel) and two auxiliary Binputs (one in each channel).

Inout Selector switch on front panel has positions for feednpur serecror swiren on rronr panel nas polil I lun::o lUI ."''''... -

ing FM tuner output to one channel and AM tuner toother, or FM tuner to one channel and FM Multiplexadapter output to other.

3. May be used as either two independent amplifierpreamplifiers,or one preamplifier-control section may beset free to operate an external power amplifier and theother preampl iFier-control section used to drive both internal power amplifiers connected in parallel at thespeaker connection terminals. A top - of-chassis sl ideswitch permits choice of operation .

4. Ganged level controls and a separate focus (balance)control.

5. Independent full-range bass and treble tone controlsin each channel. Tone controls of the low distortionvariable cross-over feedback type.

6. Identical Williamson type, push-pull EL84power amplifiers with high quality output transformers.

7. Hum balance control, panel-mounted fuse, pi lot lamp,convenience outlets.

8. EICO "low silhouette" construction employing horizontal chassis for proper layout and component separation.Easyconsole installation, if desired, with complete shielding and adapatability to any panel thickness.

Copyright © 1958 Electronic Instrument Company, Inc .

SPECIFICATIONS *

Output Power: 28 watts continuous; 56 watts peak.

1M Distortion (60c &7kc at 4: 1): 2% at 28 watts; 0.5%at 10 watts.

Frequency Response: (2w):I:O. 5db 10c to lOOkc.

HarmonicDistortion: 16 watts at less than 1% 30c to lOkc;20 watts at Iess than 1% 40 c to 10kc; 28 watts atless than 1% 50c to 5kc; 8.4 watts at less than2% at 20c.

Transient Response: excellent square wave reproduction(4usec rise time) negligible ringing, rapid settl ingon 10kc square wave.

Transient Distortion (60 cps tone burst): less than 1% atfull power.

Inverse Feedback: 20db

Stability Margin: 12db

Damping Factor: above 8,20 cps - 15kc,

Sensitivity (input for rated output): mag. phono 4mv;tape head 7.5 ips - 2 mv; tape head 3.75 ips 3.5mv; mic - 6mv; tuners, auxiliaries - 0.5V.

2

** Hum &Noise Level (below rated output): mag. phono 60db; tape head - 51 db; mic - 57 db; tuners, auxll iaries - 75 db.

Tone Control Range: ±15db at 50c and 10kc.

Speaker Connections: 4,8, and 16 ohms.

Tubes: 4 - ECC83/12AX7, 2 - ECC82/12AU7, 4- EL84,2 - EZ81.

Size: 15" wide, 4 3/4" high, 10 1/2" deep.

Weight: 241bs.

* Where power output is involved, figures are given fortwo channels combined; divide power output figures bytwo for specifications of each channel alone. Designproperty specifications refer, of course, to either or bothchannels.

** Measured with tone controls set "flat", LEVEL controlmaximum, and FOCUS control set for maximum gain inchanne I checked.

mechanical installation

GENERAL

a) HEAT DISSIPATION(VENTILATION): In common withother electronic equipment, the HF-81 produces considerable heat in normal operation. Unless continuous and adequate air flow isobtained around the heat producing elements, these elements will over-heat and their useful lifewill be greatly curtailed.

It is useful to understand the process of convection whereby heat is removed in judging the suitability of a location.Air heated by the heat-producing elements expands andrises; cool air is drawn from beneath to take the place ofthe heated air. In this manner, a stream of air is set inmotion which continually removes heat from the amplifier. (In particular, we are mainly concerned with themajor heat-producing elements; the four EL84 output tubesand the two EZ81 rectifier tubes.) If there is any impediment to or constriction of the airflow, the essential processof heat removal will be adversely affected.

Adequate ventilation will be provided if the amplifier isinstalled in an open-back console provided that the topof the amplifier is spaced at least two inches below anyshelf mounted above it. If the cabinet is enclosed at therear, provide several large holes or slots as low down andas high up in the cabinet back as possible. As an alternate, holes may be provided in the sides, bottom, or topof the cabinet. The important thing to remember is that

~ff~~ti~e ve~tiiation requires provis~n for cooi air to enter at the bottom and hot air to leave at the top.

]f the amplifier is not installed in a console, it may besituated on an open surface or on a shelf of a bookccse,Four rubber feet are also provided so that the amplifier willnot mar the surface of furniture on which it is placed.

b) EASY ACCESS TO CONTROLS: Mount the amplifierat a height which will permit easy manipulation of the controls. Tuner controls should be located nearby.

c) ACCESSIBILITY TO PARTS:. Tubes are the most frequently replaced items in electronic equipment. If theamplifier is installed in a console, sufficient space shouldbe alloted to reach and remove any tube in the amplifier.Furthermore, input and output terminals of the amplifiershould be accessible to permit easy interchanging of system components for comparison, and connection or disconnection of a portable tape recorder which is stored away when not in use. If antennas are strung around theback of the console in which the amplifier is installed,arrange them so they will not interfere with access to theamplifier.

d) ACOUSTICAL ISOLATION: If amplifier and speakerare installed in the same cabinet (not recommended), provide sufficient separation to minimize mechanical speakervibration reaching the amplifier. The minimum separationis about one foot.

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CONSOLE MOUNTING

a) 0 erations on console front anel reI iminar to am Iifier mounting: 1 Tape the panel template provided tothe face of the console so that the top of the mounting surface line on the template is level with the top of theamplifier mounting shelf. Note: When shelf is not available, tape the template at any convenient spot on the faceof the console. (2) Use an awl or a nai I to pierce thecenters of the four extreme outer holes for mounting thecontrol plate)' to transfer their locations to the consolepanel beneath. (3) Trace out the rectangular cutout withan awl or nail and then pierce the centers of the four 1/2"holes)' one in each corner of the cutout. (4) Remove thepanel template. (5) Drill the four 1/2" holes in the console panel, one in each corner of the rectangular cutoutarea. Cut out the rectangular piece with a keyhole saw)'using the four 1/2" holes as starting holes.

b) Am Iifier mounting in console: (1) Pull off the controlknobs. 2 Remove the four screws that fasten the bezelto the side pieces and remove the bezel. {3} Remove thetwo screws and nuts that fasten the control plate to thebezel. The bezel is not used in console mounting. ~)

Fasten the control plate to the console panel with the two#4x3/8 wood screws supplied. (5) If the rubber feet havebeen inserted irwhe bottom plate)' remove them. (They maybe pried out with a thin screwdriver.) (6) Place the unit _on the mounting shelf and slide it forward until the slide

_ • __. ~ _1 t I I

switch support bracket is up against the panel and theslide switch accessible from the front; the control shaftsshould be approximately centered in the correspondingholes in the control plate. (7) With a sharp pencil, drawthe outl ine of the side and rear bottom edges on the chassisshelf. As the bottom plate falls short of the full width by3/16" on each side)' draw new side edge lines 3/16" inside the original side edge lines. (8) Now remove theknobs and take the chassis off the shelf. (9) Remove the6screws which fasten the bottom plate to the chassis. (10)Place the bottom plate exactly in the outl ine drawn on theshelf and mark the position of the center hole on the leftside and the center hole on the right side. (11) Removethe bottom plate and drill each of the marked holes on theshelf to a diameter of 1/4". (12) Refasten the bottomplate to the chassis, with the four of the six#8x3/8screwspreviously removed, using the two holes at the rear and thetwo holes at the front of the chassis. (13) Replace thechassis on the she lf, positioning it exactly in the outlinepreviously drawn, and restore the knobs. This time makesure that the indicator dot on each knob agrees with thecontrol position. (14) From the bottom side of the shelf,insert a #8 x I" screw, with a 1/2" flat washer againstthe head, through both the left and right side center holes.These screws engage the stamped nut over each hole onthe chassis flange and when tightened secure the chassisto the shelf.

electrical installation

The HF-81 can be used in two ways for a stereophonicsystem. In all cases, plug monophonic sources and onetrack of monophonic/stereophonic sources in the channel1 inputs; plug the other track of stereo sources in the channel 2 inputs. It is assumed in what follows that a stereophonic phono cartridge is being used . Monophonic phonorefers to playback of a monophonic recording with a stereophonic cartridge.

CH.2

32 16 8 .4 G

(J) (]) (J) (J) ()

TO MATCHINGTAP

CH.I

32 16 S 4 G

TO MATCHINGTAP

FIG. 10. SPEAKER CONNECTIONS

a) INTERNAL POWER AMPLIFIERS OPERATED SEPARATELY, EACH DRIVING ONE SPEAKER OF A STEREO PAIR.This arrangement is used when there is no other amplifierthe user desires to include in the system. The SERVICESEL.sl ide switch on top of the chassis must be set to SEParate. Signal connections are all internal, so only thespeaker connection need to shown (Fig. la, rear chassisview). The internal arrangemention in the HF-81 at eachof the positions of the FUNCTION selector are shown inFigs. lb, lc, ld, le, H, and Ig, as an aid to understanding the operation with this arrangement.

SPKR.2 SPKR.I

FIG.lbCHECK AMPL. 1

CH.I HIGH CH.lLEVEL INPUTS TAPE OUT

CH.I LOW _--_IPREAMPt r r:r<5NEl t --IIPOWER AMP L-- SPEAKERLEVEL INPUTS . CH.I~ . CH.l ~ CH.I

FIG.lcCHECK AMPL. 2

CH. 2 LOWLEVEL INPUTS

Ip~:,~p~! --II PO~~.~AMP~SP~~;R

CH.2 HIGH CH.2LEVEL INPUTS TAPE OUT

CH.l HIGHLEVEL INPUTS

CH.lTAPE OUT

1--__ SPEAKERCH.I

CH.l LOWLEVEL INPUTS

FIG.ldSTEREO NORMAL

CH.2 LOWLEVEL INPUTS

SERVICE SEL.

IPREAMP~ SEP ••• jr-P""':"O-W""':"ER:"""AM-:-:-:"P::-1L-- SPEAKERCH.2 I 1 19!:2J ~ . CH.2 ~ CH.2



CH.ITAPE OUT

1--__ SPEAKER

CH.2

1-_'- SPEAKERCH.l

CH.I LOWLEVEL INPUTS


FIG.leSTEREO REVERSE

CH.2HIGHLEVEL INPUTS

CH.2TAPE OUT

4

CH.I HIGHLEVEL INPUTS

CH.ITAPE OUT

1-__ SPEAKER

CH ICH.I LOW

LEVEL INPUTS

FIG.1fMONOPHONIC TUNER,

TAPE, TV SEP 1---_ SPEAKERCH.2

CH.2TAPE OUT

CH. I HIGHLEVEL INPUTS

CH. ITAPE OUT

I--__ SPEAKERCH. I

CH. I LOWLEVEL INPUTS

FIG. 19MONOPHONIC PHONO


~SEP., •CH.2


SERVICE SEL

IPOWER AMP If-__SPEAKER

CH.2. • CH.2

* On integrated amplifiers HF20, HF32 feed into TAPtOUTPUT [eekj en HF52r feed into ELECTRONIC CROSSOVER INPUT jack, after severing connection betweenELECTRONIC CROSSOVER IN and OUT jacks.

FIG. 20. SPEAKER & EXTERNALSIGNAL CONNECTIONS.

G4

CH.I

32 16 8

CH.2

4 G

~_~__~ ~ p (J).- - - - - - - - - - - - - - I

I,II

. I::11

:Q itl'" "'I~ 0,o ""Ico I

1II

32 16

-''- -- -- --- '1EXTERNAL BASICPOWERAMPLIFI ER '

~I~,

~I

1 -

o

TAP!:OUT

"INPUT

2

b) INTERNAL POWER AMPLIFIERS COMBINED (TIEDTOGETHER AT THE INPUTS AND PARALLELED AT THEOUTPUTS) TO DRIVE ONE SPEAKER OF A STEREO PAIR.This arrangement is employedwhen the useralready has ahigh quality amplifier (usually 20watts or more if it is tobe worthwhile) which he desire to include in the system.The oreamo-tone control combination including the regltie preamp-Tone conrroi COmOlnUJlUlI 11I"'IU\,llll~ """ '''''l:f-ular CHI·tone control feeds the combined internal poweramplifiers; the preamp-tone control combination including

. the regular CH2 tone control feeds out through the CH2TAPE OUT jack to an external power amplifier. The SERVICE SELECTOR switch on the chassis must be set at theCOMbined position for this service in order to disconnectthe input of the CH2 power amplifier from the output ofthe CH2 tone control and connects it instead to the inputof the CH1 power amplifier. The CHI and CH2 poweramplifiers are paralleled at the outputs, as shown, by anexternal jumper connected between corresponding speakerconnection taps . The external signal connection and thespeaker connections are shown in Fig. Zc, The internalarrangements in the HF-81 at each of the positions of theFUNCTION selector are shown in Figs. 2b, 2c, 2d, 2e,2f, and 2g, as an aid to understanding the operation withthis' arrangement.

CH.I HIGHLEVEL INPUTS

CH.ITAPE OUT

FIG.2bCHECK AMPL. 1


SPEAKERCH.I

5

FIG.2cCHECK AMPL. 2


CH.2 HIGHLEVEL INPUTS

CH.2TAPE OUT

_ SPEAKERCH.2

CH. I HIGHLEVEL INPUTS

CH.ITAPE OUT

FIG.2dSTEREO NORMAL



SPEAKERCH.I


CH.2TAPE OUT

_ SPEAKERCH.2

FIG.2eSTEREO REVERSE

CH.l LOW ... _LEVEL INPUTS


SPEAKERCH.I


CH.2TAPE OUT

I--_--.:SPEAKERCH.2



FIG.2fMONOPHONIC TUNER,

TAPE, TV

SPEAKERCH.l

!POWERAMP I, __--=SPEAKER~----. EXTERNAL"'"' • CH.2

CH.2TAPE OUT

I

6


FIG.2gMONOPHONIC PHONO




CH.lTAPE OUT

CH.2TAPE OUT

SPEAKERCH.l

f--- SPEAKERCH.2

c) INPUTS: There are identical pairs of MAG. PHONO,TAPE HEAD, MICROPHONE, AUXILIARY A, and AUXILIARY Binputs -one of each pair in channell and channel 2 - and each is identified accordingly by the suffix1 or 2. The MAG. PHONO, TAPE HEAD, and MICROPHONE pairs of inputs are all "low level" inputs, meaning that they all feed through a preamplifier/equalizerstage in either channel 1 or 2. The AUXILIARY A andAUXILIARY Bpairsofinputs are "high level" inputs, meaning that they enter either channel 1 or 2 at a point afterthe preampl ifier/equalizer stages. The AM, FM and FMFM Multiplex inputs are also "high level inputs", whichnr", intArnnllv ~"'IA...,t",rl in nnir~ - nn", fnr ",n...,h ...,hnnn"'lare Interne y se ectea In pal rs - one for each channe- by the INPUT SEL. switch. At the MONAURAL position of the FUNCTION SEL., AM only is selected at theAM-FMposition of the INPUT SEL., and FMonlyis selected at the FM- FM MULTI. position of the INPUT SEL.

l) MAG. PHONO 1, MAG. PHONO 2: These inputsare intended for the two outputs ofa stereo magnetic cartridge, or for a stereo ceramic cartridge with adaptors.The correct method for wiring a three terminal cartridgeis shown in Fig. 3. If the cartridge is a four terminaltype, short the two inside terminals of the cartridge together and treat it exactly as if it were the single centerterminal shown in Fig. 3. The loading presented to eachoutput of the cartridge by each MAG. PHONO input is100,000 ohms. If a lower loading resistance is requiredby the particular cartridge used, connect a shunt resistorof appropriate value from each outside terminal of the cartridge to the center (common) terminal. This can be doneactually by mounting a 3-post terminal strip on the underside of the phonograph mounting board at a point near thelead break-out from the pickup arm. These shunt resistorsare then wired to this terminal strip as shown in Fig. 3.The value of each of the two shunt resistors (Rs) can bedetermined fromthe desired loading resistance (RI) by thisformula Rs = 100,000 x RI ohms

100,000 - RIor th is tabl e; for RI = 50KQ, use Rs = 1OOKQ; for RI :: 33KQ,use Rs = 50KQ; for RI = 25KQ, use Rs = 33KQ.

7

* NOTE: All ceramic cartridge manufacturers have developed simple networks which when connected the outputsof their cartridges result in a characteristic identical tothat of magnetic cartridges. By interposing the recommended adaptor for the particular ceramic cartridge between the cartridge outputs and the MAG. PHONO inputs of the amplifier, it is possible to use the MAG. PHONOinputs for the ceramic cartridge with excellent results.Adaptor networks are given in the literature for the particular ceramic cartridge and can be built on a terminalstrip mounted on the underside of the phonograph base, ormay be available in convenient component form from thecartridge manufacturer. Stereol;lhonic crystal cartridgesccrrrrcge mcnurccrurer, orereopnoruc crysTal carrnages

(Ronette "Binofluid" OV and BF40) can be connected directly to auxiliary high level inputs.

2} TAPE HEAD 1, TAPE HEAD 2: These inputs are intended for direct connection to the two outputs of a stereotape playback head. A front panel slide switch permitschoice of NARTB tape head equalization either for71/2(& 15) ips or3 3/4 ips tape speeds. The loading resistancepresented by each tape head input is 100,000 ohms.

3} MICROPHONE 1, MICROPHONE 2: These inputs areintended for rec~~:ving the output signals directly fromtwo separate microphones. It is preferable that the microphones used be of the high impedance type.

4) AUXILIARY A1, AUXILIARY A2: These inputs areintended for either a stereophonic or monophonic highlevel source. A stereophonic high level source might bea stereo tape deck with built-in playback equal izationfor both tracks. A monophonic high level source mightbe a monophonic crystal cartridge or tv sound. Plug amonophonic source intoAUXJLlARY A1, leaving theAUXILIARY A2 input unused. Note that the input impedanceat all these high level inputs is 0.5 megohm, which is toolow for ceramic cartridges requiring 2 to 3 megohms input impedance. For ceramic cartridges, use the MAG.PHONO inputs with the simple adaptor networks recommended by the manufacturers. For stereophonic crystalcartridges (Ronette "Binofluid" OVturnover and BF40 single needle), the 0.5 megohm load provided at the highlevel inputs is exactly the loading impedance required.

TO MAG. INPUT 2

B-1

~~~~-~, - (8- I

TO MAG. INPUT 1

STEREO MAG.CARTRIDGE

FIG. 35) AUXILIARY B'l, AUXILIARY B2: Same as for AUXILIARY AI, AUXILIARY A2 above.

6) AM: This input is intended for AM tuner or the AMoutput of an FM-AM tuner where the FMand AM sectionsare independent.

mentioned sources to the correspondmg amplifier inputjack. Unless the source has a low-impedance output suchas a cathode follower (with which up to 50ft. of cablecan be used), use the shortest possible connection andlow - capacity shielded cable (cable having os low as25mmfd capacitance per foot is available).

7) FM: This input is intended for an FMor FM-AM tunerwhere the FM and AM sections are~ independent.

8) FM MULTIPLEX: This input is intended to receive theoutput from an FM Multiplex adaptor.

NOTE: A shielded cable with a shielded "phono-type"plug should be used to connect from each of the above-

d) TAPE OUTPUT I, TAPE OUTPUT 2: When no externalamplifier is used in the system, both these outputs areavailable for feeding out to a stereo recorder. When anexternal power ampl ifier is used in the system, TAPE OUTPUT 2 is used to feed out to the external power amplifier.If it is desired to do stereo recording under the latterconditions, construct a device such as shown in Fig. 4.Use low capacity shielded cable for connections.

After checking the ampl ifier for proper operation, removeall input cables to the amplifier and make the followingcontrol settings which hold throughout the process of humadJustment: INPUT SELECTOR at PHONO, FUNCTIONSELECTOR at STEREO, FOCUS control at 0, LEVEL control at 10r both TREBLE controls at -5, both BASS controlsat 0; the two speaker systems mustbe in phase and placednear one another for this adJustment. Next, procede as

TO INPUT 2I V lI"1ru I ,L

OF STEREORECORDER

"'------ 1'"'--_----:....8 I!l

~ 6, (8 I!l

TO EXTERNALPOWER AMPLIFIER

follows: With your ear held close to the speakers, insertthe amplifier power plug into the wall outlet and listento the hum level. Now pull out the plug and re-insert itwith the prongs reversed. Choose the prong position withthe least hum. Now connect the tuner input connector tothe amplifier input jack, and with the tuner set betweenstations and the tuner volume control set at a minimum, dothe same with the power plug of the tuner; use either the117VAC receptacle on the HF-81 or one receptacle of acube tap inserted in the 117VAC receptacle on the HF-81.Next, connect the phono cartridge leads to the MAG.PHONO 1and 2 Inputs, and, with turntable off and pickup arm at the rest position, find the insertion position ofthe turntable line cord plug that yields lowest hum. Finally, connect the tape head leads to the TAPE HEAD 1and 2 inputs, and, with the tape deck turned off, find theinsertion position of the tape deck line cord plug that results in lowest hum. When all of this is completed, adjust the humbalance control on top of the amplifier chassisfor least hum.

TO INPUT 1~OFSTEREOU~ RECORDER

-dJHF81TAPE,",liT

OUT~-----~

._- ... '.

HUM ADJUSTMENT

2 - PHONO RECEPTACLE

STRIP FIG. 4

e) POWER CONNECTIONS: The line cord of the HF-81must be plugged into a house outlet providing normally117 volts , 60 cycles AC power. A convenience recep-tacle on the rear chassis can be used, if desired, with acube tape to provide 117VAC power to the associatedequipment. This convenience receptacle is not switchedor fused and provides 117VAC at all timeS;-regardlessof whether the HF-81 is turned on or off.

8

operation

PRELIMINARY: Be sure all tubes are firmly seated in theirsockets and that the tube shields are making good contactwith their baSes. As initial adJustments, set these controlsas follows: LEVEL at 0, FOCUS at Or both BASS controlsat O. Tum the amplifier on by turning the TREBLE 2 control clockwise from AC OFF and set it at zero initially.Also set the TREBLE 1 control at zero. Please note thatin the instructions that follow, it is assumed that a stereopick-up and/or a stereo tape head is being employed inthe system.

LISTEN IN G TO PHONOGRAPH: Set the IN PUT SELECTOR to PHONO if you have a megnetic cartridge or aceramic cartridge with adaptors interposed between thecartridge outputs and the MAG. PHONO 1and 2 inputs.(The RIAA equalization provided at the PHONOpositionis now the international standard in the recording industryfor both monophonic and stereophonic records and is alsoa very good compromise for the most important of the oldermonophonic recording characteristics.) Set the INPUTSELECTOR to AUX Aor AUX B if you are using a stereophoni c crystal cartridge (Ronette) connected to eitherAUXA or AUX B inputs. Set the FUNCTION SELECTOR ateither STEREO position. To balance levels between thechennels; playa conventional monophonic (lateral) recording on the changer or turntable and turn the LEVELcontrol up until you have normal listening level. Note_. - _. • -- r _I •• _ ., II."

that the action of the FOCUS control (sometimes called a"balance" control) is to simultaneously raise the level inone channel while lowering the level in the other as it isturned in anyone direction. At the zero setting of theFOCUS control, equal sound volumes would obtain on bothchannels only if the ideal conditions of identically efficient loudspeakers and identical overall gains in bothchannels existed. With the conventional monophonic recording being played, adJust the FOCUS control for equalvolume from each speaker system. With the FOCUS setting properly made, any stereo recording played back willhave close to the same balance as actually exists in therecording. The FOCUS control setting can be a semi-permanent adJustment in that, at any given time, the settingachieved as described above will usually be satisfactoryfor tape stereo, and may also be for broadcast stereo, ifit means existof adJusting for equal output levels from thestereo broadcast rece iving equ ipment. Ascomponents age,a shift of the normal FOCUS control setting may be necessary. Note that there are a concentricpairofbass controls, one in each channel and a concentric pair of treblecontrols, one in each channel. Use the separate bass andtreble controls to compensate for any audible deviationof the recording from the standard recording characteristic,as well as to compensate for the over-all characteristicsof your audio system (including room acoustics). Set theFUNCTION SELECTOR to STEREO NORMAL or STEREOREVERSE for stereophonic records and to MONOPHONICPHON 0 for CONVENTIONAL MON OPHON IC records.

LISTENING TO TAPE DECK (direct connection to tape

9

head): Set the INPUT SELECTOR to TAPE. NARTB tapehead equalization is provided in both channels for thetape speed selected with the TAPE switch on the frontp~nel" One position is for7-1/2and 15ips tapes and theother for 3 3/4 ips tapes. These equalizations are theindustry standard for pre-recorded stereophon ic and monophonic tapes. If the FOCUS' control has been set asdescribed in the preceding paragraph, it will usually besatisfactory for this function also. Otherwise, it may beset in a similar manner using a test tapeorsimply by ear.Set the FUNCTION SELECTOR to STEREO NORMAL orREVERSE for stereophonic tapes or to MONOPHONICTUNER, AUX for monophonic tapes. Use the BASS andTREBLE tone controls as described above.

LISTENING TOAMONOPHONIC SOURCECONNECTED TO AUXILIARY AI, AUXILIARY Bl, TO MONOPHONIC AM BROADCAST, ORTO MONOPHONIC FMBROADCAST: Set the INPUT SELECTOR to AUX. A,AUX.B, AM-FM, or FM-MULtt. respectively and theFUNCT10N SELECTOR to MO~OPHONIC TUNER,AUX.Use the BASS and TREBLE controls as described previous IY»

LISTENING TO A STEREOPHONIC SOURCE CONNECTED TO AUXILIARY Al and A2, AUXILIARY B1 and 82,AM and FM, FM and FM MULTIPLEX: Set the INPUTSELECTOR to AUX A, AUX Br AM-FM, or FM-MULTI-----·--· .. ·-,·-"- .. ·r '·'-"'-r , _ ••••• '.'--'11

respectively. Set the FUNCTION SELECTOR at STEREONORMAL or STEREO REVERSE. The FOCUS, BASS andTREBLE controls are set as described previously.

MAKING RECORDINGS: Tape recordings may be madeby connecting the recorder to the TAPE OUTPUT Jacks.See "TAPE OUTPUT 1, TAPE OUTPUT 2" under ELECTRICAL INSTALLATION. Please note that recordingscannot be made on tape decks unless those decks areequipped with the electronics required for recording.

FUNCTION SELECTOR: The STEREO NORMAL and STEREO REVERSE positions are both used for stereophonic reproduction. At the STEREO REVERSE position, the channel 1 and channel 2 amplifiers from the tone controls tothe speaker connections are interchanged. These twopositions permit interchanging the signals fed to the twospeakers so that the correct left to right display of theorchestra can be achieved on all recordings or broadcasts.The CHECK AMPL. 1 and CHECK AMPL. 2 positions permit hearing either channel 1 alone or channel 2 alone forcomparison or balancing purposes during stereophoni c use.The MONOPHONIC TUNERr AUX position is used formonophonic FM, AM, tv sound, monophonic phono cartridge monophoni c pre-ampl ified tape etc., fed into channell inputs. At this posltlon, the channel 2 inputs whichare unused in this type of operetlon, are disconnectedfrom t-he active channel so that they cannot contributeinterference. At the MONOPHONIC PHONO position,the channel 1and 2 corresponding inputs are mixed, whichis useful when playing monophonic records with a stereophonic cartridge to cancel vertical rumble components.

BASS CONTROL 1, BASS CONTROL 2 (CONCENTRIC):The plus sign on the right side of the dial indicates that

clockwise rotation from the mid-point (0) of either controlincreases (boosts) _bas~ response; the minus sign on the leftside indicates that counter-clockwise rotation from the

mid-point decreases (cuts) bass response. There is no in-teraction with the TREBLE control. Start all adjustmentswith this control set at the mid-point (0), which is calledthe "flat" position since bass response is neither cut norboosted at this position.

maintenance

TREBLE CONTROL 1, TREBLE CONTROL 2 (CONCEN-TRIC): The plus sign on the right side of the dial indicatesthat clockwise rotation from the mid-point (0) of eithercontrol increases (boosts) treble response; the minus signindicates that counter-clockwise rotation from the mid-point decreases (cuts) treble response. There is no inter-action with the BASS control. Start all adjustments withthis control set at the mid-point (0), whi ch is called theflat" position since treble response is neither cut nor

boosted at this position.

GENERAL

Your amplifiershou Id require I ittle service except for nor-mal tube replacement. We recommend no substitutions forthe tube types used in this amplifier except as stated. Allthe tube types used are distributed national Iy, but replace-ments can be obtained directly from EICO if desired.

To facil itateservicing, remedial and trouble-shooting pro-cedures have been provided in the TROUBLE-SHOOTINGCHART that follows. A VOLTAGE AND RESISTANCECHART is also provided as an aid in locating defectivecomponents. DC operating voltages are given both at nosignal and signal developing 14 watts output, as well asthe corresponding 1 kc signal voltages.

TROUBLE-SHOOTING PROCEDURES

Connect the leads from the stereo cartridge and from thetwo speakers to the amplifier. These connections are madeas described in the section "Electrical Connections " . Setthe Input Selector control at PHONOand the Function Se-lector at STEREO. Playa known high quality stereo record-ing on the phonograph. If there is no output to the speakerof if the output is low or audibly distorted, procede to thechecks for those symptoms. If there is excessive hum in

. the output, disconnect the phono input cable from theampl ifier and short the phono input jack to chassis. If thehum disappears, the trouble is not in the amplif.er but inthe phonograph or in the connection to the amplifier. each case, check for the trouble in the amplifier whichseems defective. If both amplifiers are defective, checkthe power supply.

The cause of phonograph hum may be a metal pick-up armnot grounded to the cable shield (try a good single groundconnection to the cable shield from turntable frame, pick-up arm, and cartridge case), direct hum pick-up by themagnetic cartridge from the record player motor(tryusinga rubber mat on the turntable to increase the separation ofthe pick-up from the motor), or pick-up from a power

transformer or other magnetic field in the vicinity (trymoving phonograph away from suspected source). Checkalso that the phono input cable shielding is grounded tothe ampl !fier chassis at one point only, through the skirtof the input connector where it plugs into the ampl ifier.Finally, try a good building ground such as a connectionfrom a cold water pipe terminated under speaker terminal

G" on the amplifier Do not connect such a ground wireto other components in the system If possible, let eachchannel be connected to the amplifier using a separateshielded cable to the ampl ifier input. It is also desirablethat the ground leads on both cables not be connected to-

gether at any point - not even at the cartridge. How-ever, with some cartridges, it will not be possible to do

this. In this case, just disregard this last instruction.

Excessive hum on other inputs may be checked in a similarmanner. Disconnect the input cable in question and shortthe particular input jack to the chassis. If the hum dis-appears, the trouble is external to the amp! ifier. Notethat on all inputs, the braid of th;;; input cable shou Id con-nect to the ampl ifier only through the skirt of the inputconnector. The cause and remedies for the following

symptoms are then based on the assumption that checks

made in the manner described above have eliminated thepossibilityof the trouble being external to the amplifier.

If the trouble is no output or low output, check AC signalvoltages and DC operating voltages starting at the inputand work step_by-step toward the output in each ampl i-fier. Set the VOLUME control to maximum (10), theFOCUS, BASS and TREBLE controls to their mid-points(0), the INPUT SELECTOR to PHONO and the FUNC-TION SELECTOR to STEREO . Use a 1000cycle sine-

wave signal, such as supplied by the EICO 377 Sine &Square Wave Audio Generator In addition, use a pre-cision 100: 1 attenuator to permit obtaining a level of

0035 volt fed into MAG. PHONO from an audio gen-erator output of 0. 35 volts, which can easily be measuredonthelowestACvolts range ofyourVTVM (also improvessignal to hum from generator). Use a high input imped-

ance VTVM for all AC signal voltage measurements; aVTVM or 20, OOOQ/v YOM for DC volts measurements.

. If the trouble is an excessively distorted output, try tubereplacement, signal tracing, or procede directly to vol-tage and resistance measurements.

When the defective stage is local ized, procede to a resist-ance and voltage check of the stage, using the data in theVOLTAGE and RESISTANCE chart. Disconnect theampli-fier from the power line and discharge capacitors prior tomaking any resistance check and prior to removing any orall of theEL84output tubes. Do not turn the amplifier onwith any of the output tubes remove

CHECKING A TYPICAL TUBE STAGE

1. Check tube.2. Check plate and cathode resistor.3. Check coupl ing capacitors for leakage or short.4. For output stage, check dc resistance of transformerwindings.5. Check grid leak resistor for open.6. Check cathode by-pass capacitors for short.7. If no or low B+ voltage on tube, check decoupling

path for open or defective R60, R61, R62, R63 and fiI tercapacitor C37, C38 or C39.8. . If wiring and circuit components including the tubecheck O. K. and B+ voltage is excessive)' check the de-coupl ing path for short or defective R60, R61, R62and R63.

Suspected trouble in the equalization)' tone, focus, andvolume controls and networks should lead to specific re-sistance and capacitance checks to localize the trouble.In general, if the user suspects poor frequency response,defective equal ization)' or defective operation of the tonecontrols, the amplifier should be tested thoroughly withaudio generator, vtvm, and scope.

SPEAKER PHASING

IMPORTANT NOTE ON SPEAKER PHASING: The twoloudspeaker systems must be connected so that they operate.in phase, meaning that corresponding cones or diaphragmsin the systems move in and out together when actuated bythe same or similar signals. A simple method of checkingthis is to playa conventional monophonic (lateral) record-ing having considerable bass program material, setting theFUNCTION SELECTOR at MONAURAL. After listeningfor a few minutes, reverse the connections of the speakerleads at only one of the speaker systems - not both - andlisten again to the same program material. Normally, youwi II noti ce that one of these connections seems to give

bass re-inforcement and the other bass cancellation. The

connection that gives bass re-inforcement is the in-phaseconnection and should be used.

Another criterion for the in-phase connection is that ofblending, which can be best applied if the speaker systemsare identical or at least have similar middle and highfrequency range reproducers. With the in-phase con-nection and both speakers operating at approximately thesame volume level, a monophonic source will appear to beemanating from a point mid-way between and the twospeakers will blend. With the out-of-phase connection,the two sources will appear to remain separate.

SERVICE

If trouble developes in your instrument which you can;.,tremedy yourself, write to our service department listingall possible indications that might be helpful. If desiredyou may return the instrument to our factory where it wi be placed in operating condition for $12. 50 plus the costof parts replaced due to their being damaged in the courseof construction. NOTE: Before returning .this unit, besure all parts are securely mounted. Attach a tag to theinstrument, giving your home address and the trouble with

the unit. Pack very carefully in a rugged container)' us-ing sufficient packing material (cotton, shredded news-paper, or excelsior), to make the unit completely immov-able within the container. The original shipping cartonis satisfactory, providing the original inserts are used orsufficient packing material inserted to keep the instru-ment immovable. Ship by prepaid Railway Express, ifpossible, to Electronic Instrument Co., Inc., 33-00 North-ern Blvd., Long Island City I, New York. Return ship-mentwill be made byexpress collect. Note that a carriercannot be held liable for damages in transit if packingIN HIS OPINION)' is insufficient.

SYMPTOM

Amplifier causes power line fuse toblow. Power line fuse blows againwith VII & V12 out of their sockets.

Amplifier causes power line fuse toblow. Power line fuse does not blowagain with VII & V12 out of theirsockets.

Any or all tube filaments not lit.

Output tube bias too high (result-ing in distorted output waveform).

DC voltage at Vl1, V12 cathodes(pin 3) is incorrect as specifiedbelow.

a) No voltage.

b) High voltage.

c) Low voltage.

Excessive hum on mag. phono tapehead or mic.

Excessive noise on mag. phonotape head or mic.

Sustained oscillations.

Sustained microphonicson mag.phono, tape head or mi c.

Hum on all inputs.

TROUBLE-SHOOTING CHART

CAUSE REMEDY

Line cord, J16, primary or high voltage Replace or repair.secondary windings of T1 shorted internallyor externally (wiring).

VII, V12, C39)' V7, va, V9, VI0, or T2 T3 primary shorted internally or exter-nally.

Open tube fil ament.Open lead from 6. 3V winding of T1.6 3 V winding of T1 open.

Open R56, R57.

Defective VII or V12.

C39 shorted internally or externally.

Connection from C39 to pin 3 of VII& V12 broken.Connection to center tap of h. v. second-ary winding of T1 open.Output tubes V7, VS, V9, VI0 over-biased or not drawing current. May re-sult from open R56 or R57.

Excessive current drain in amplifier.

Defective VII, V12.

VI or V2 defective.FiI. leads dressed toa close to gridlead.Tube shield not making electrical con-

tact to base or base not making elec-

trical contact to chassis.

Shielding and grounding of wiring toinput jacks not exactly as instructed

and shown in drawings.

VI and V2 and contacts dirty.

Poor dress of output transformer T2 orT3 leads.

VI or V2 defective.

V3 or V4 defective, not properly

shielded, or dirty sockets and contacts.

Dress of power transformer T1 leads.

Replace or repair.

Replace or repair.

Replace or repair.

ReplaceReplace or repair.

Repair

'#" .

Repair

Replace, repair, or see trouble-

shooting typical tube stage.

See trouble-shooting typical tube

stage.Replace

ReplaceDress fit. leads away from grid lead.

Check and correct.

Correct

Clean throughly with carbontetrachloride.

Dress all input leads and T3 leadsaway from each other. Keep T3

leads away from input jacks.

Replace

Replace, correct, or clean.

Correct

VOLTAGE AND RESISTANCE CHART

TUBE PIN# OPERATING VOLTS OPERATING VOLTS SIGNAL VOLTS OHMS

AT NO SIGNAL AT 14W OUT (1 kc) at 30W OUT UN IT DISCONNECTED(DC UNLESS NOTED) (DC UNLESS NOTED) FROM POWER)

CC83(12AX7 290KO014 IMO

7KO

4&5 filament (OVDC; 6. 3VAC to pin 9) 500290KO

0035 90KO2KO

filament 500

ECC83/12AX7 290KOIMO

7KO

4&5 filament (OVDC; 6. 3VAC to pin 9) 500290KO90KO

2KOfi lament 500

ECC82/12AU7 1. 2 120KO

V3, V4 61OKO. 1 3KO

4&5 filament (OVDC; 6. 3VAC to pin 9) 500170KO190KO

1. 8 1. 75 065 8KOfilament 500

ECC83/12AX7 195 190 100KO

V5, V6 470KO100KO

4&5 filament (OVDC; 6. 3VAC to pin 9) 500470KO

1. 15 250KO1. 1 7KO

filament 500

EL84(6BQ5 340KO,1, 340KO

12. 14.

. \.

16504&5 filament (OVDC; 6. 3V AC between pins 4 & 5) 500

330KO335 325 180 165 1900

330KO330 320 3500

EL84(6BQ5 340KO340KO

12. 14. 03* 16504&5 filament (OVDC; 6. 3V AC between pins 4 & 5) 500

6 2 330KO-,7 335 325 180 330KO

330 320 3500

EL84/6BQ5V9, V10

EZ81/6CA4VII, V12

4&5

4&5

* = 60 cycles

0 6.12. 7 14. 7 . 03 *filament (OVDC; 6. 3VAC between pins 4 & 5)

340KQ340KQ165Q

50 Q

335

330

325

320

165- 190 Q330KQ350Q

180

290 V AC * 29OV AC* 290* 45-55 Q340 335 7.filament (340VDC; 6. 3VAC between pins 4 & 5)

100KQ100KQ

290V AC * 290* 45-55 Q290V AC *

All resistance measurements, except those made from pin 3 of Vl1 and V12 (EZ81 rectifier), aremade with pin 3 of V11 and V12 grounded. All voltage and resistance measurements are measuredto chassis with the controls set as follows: INPUT SELECTOR to PHONO, FUNCTION SELECTORto STERO NORMAL)' LEVEL at 10, BASS, TREBLE & FOCUS controls at O. For voltage measurementsat 14W output, set the input selector to the PHONO position and feed a O. 0035volt (;3. 5mv) 1 kcsignal to the CH 1 & CH 2 Mag. Phono Input jacks; connect a resistive (preferably non-inductive)load to the output of each amplifier, of equal resistance to the tap selected (::1:20%), and capable ofhandling 15 watts. Voltage measurements are made with a VTVM. Operating line voltage atwhlchvoltage measurements are made is 117VAC, 60cps. NOTE: ALL VOLTAGE & RESISTANCE VALUESNORMALLY BY::I:15%.

SECTION AUXA AUX B AM-FM FM-MUL TI MIC PHONO TAPE

INPUT

SELECTOR11- 11-

SWITCHS 1 2-6-

10- 11- 10- 11- 10- 12 10- 10- 11- 10- 11-

3- 7

4-11 1 -4- 2-4- 3-4-

3-6-10- 10- 12. 10- 10- 10-

1":1210-

10- 10- 10- 9- 1 0- 10- 10-11

SECTION AMPL. 1 AMPL. 2 NORMAL REVERSE TUNER AUX. PHONO

FUNCTIONSELECTORSWITCH 4- 10 3-4-7

1) Entries are numbers of those switch contacts which are connected together by the rotors at the particular position.

NC means no connection.2) On schematic diagram, all switch wafers shown in the maximum counter_clockwise position (AUXA and CH 1CHECK)as

seen from the front or shaft end.

TOP VIEW

~'-'t'~ ECC83/12AX7

~~L~~/6BQ5 ~~~84/6BQ5

~~~

84/6BQ5 ~~L~4/6BQ5

OPERATES FROM ""V

SO/6C CYCLE AC LINE

MODEL HF- POWER CONSUMPT'ON.

DUAL 14 WATT HIGH FIDELITY 140 WATTS

INTEGRATED AMPL"'ER

r'\ V- r'\ECC83/12AX7V ECC82/12AU7V

r'\ r'\ V-ECC83/12AX7V VECC83/12AX7

r'\V- 11 r'\V-

r'\V- VEZ81 \JEZ81VECC82/12AU7

ELECTRONIC INST. 'CO.. INC.

noo NORTHERN BLVD

L , CITY 1 N Y

FRONT

AUX A

iUEIiJ.MODEL HF- AUX BDUAL 14 WATT HIGH FIDELITY

INTEGRATED AMPLIFIER

OAM MULTIO

OFM3 AMPS 117 VAC TAPE OUT SPEAKER CONNECTIONS

(Q) ITJJ 10 0 0 001 100000\ 000 000CH- 2 CH. MIC PHONO TAPE MIC PHONO TAPE

CHANNEL 2 CHANNEL 1 CHANNEL 1 CHANNEL 2

REPLACEMENT PARTS LIST

Stock' Symbol Description Stock' Description

20050 Cl, cop. , paper

, .

25mfd, 200V ~1\T TB15, terminal strip, 2 past right

23014 C3, cop., elec., lOmfd, 6V 54000 TB17 terminal strip, lP left

23020 C5, cap., elec. , 25mfd, 6V 90034 Vl, tube, 12AX7

22517 C7, 33, cap., disc., . 025mfd, GMV (25K or 25,OOOmmf) 90033 tube, 12AU7

C35, 36, 45, 46 90039 V7, 8, 9, tube, EL84

22514 C9, cap., disc., 850mmf, "'10% 90038 Vll, tube, EZ81

22518 Cl1, cap., disc., . 0027mfd, "'10% (2. 7K or 2700mmf) 97800 XFl fusebolder

22550. C13, cap. disc., 6oommf, "'10% 97712 XII pilot assembly

22506 C15, cop. disc.

, .

02mfd, "'10% (20K or 20,000mmf) 97027 XV1, 2, 3, sacket, 9 pin min. w/shield

20039 CI7, 18, 21, cap.,molded,. lmfd, 400V, "'10% ...97025 XV5, 6, 7, 8, socket, 9 pin min.

22520 CI9, 20, 41, cap., disc., . 0012mfd, "'10% (1.2Kor 1200mmf) 10,

22529 C23, cap. disc., 150mmf, "'10% 40000 nut, hex, '6-22543 C25, 26, 27, 28 cap., disc., 225mmf, "'10% 40001 nut, hex, '3/8-23007 C29, cap., elec., 5Omfd, 25V 40007 nut, he", '4-4022533 C31, 32, 43, 44 cap., disc., 47mmf, "'10% 40008 nut, he", '8-3224005 C37 cap. , elec., 4O- 40- 20mfd/350- 350- 400V 40016 nut, for fuse holder

23016 C38, cap., elec., 30mfd, 4O0V 40026 nut, lin., '8-20043 C40 cap., molded, .03mfd, 600V 40027 nut, tin., angle bracket

22519 C47, 48 cap., disc., . 0Imfd, "'10% (10K or 10,000mmf) 41000 screw, '6- 32 x 1/491005 fuse, 30mp 41003 screw, '8- 32 x 3/892000 pilot light, '47 41016 screw, '4- 40 x 1/450020 JI- jack, quad, 41026 screw, '4-40 x 1/4 brass

50018 J5- jack, triple 41027 screw, '4 wood10. 41028 screw, '8- 32 x 1

11- 12- 41045 screw, '6 P. K. brown50011 J14- jack, dual 41046 screw, '8- 32 brown50016 J16 outlet, convenience 41047 screw, '8 P. K.

"'" 29751 PCl, printed circuit 42000 washer, '3/8 lock10407 Rl, res., IMQ, 1/~, "'10% (brown, black,green, silver) 42002 washer, '6 lock

..,..

10400 R:r,4, 40, 41, res., 10KQ 1/~, "'10% (brown, black, orange, silver) 42007 ~sher, '4 lock53, 54, 42008 washer, '8 lock

11526 RS, 6, 11 res., 200KQ, 1/~, '" 5% (red, black, yellow, gold) 42029 washer, rubber, forfuseholder10423 res., 2. 2KQ, 1/'NI, "'lOOk. (red, red, red silver) 42032 washer, fiAt, '810430 R13 res., 4. 7KQ, 1/~, :10% (yellow, vi~let red, silver) 43000 lug, '6 ground11504 R15, res., 90KQ, 1/'NI 5% (white, black, orange, gold) 43001 lug, '3/8 pot ground11527 RI7 18, 44, 45, res., 100KQ 1/'NI, '" 5% (brown, black,yellow,gold) 43004 lug, 18 ground

46, 46000 grommet, 3/8

10422 R19 20, 60 res., 68KQ, 1/'NI, :10% (blue, grey, orange, silver) 46006 feet, rubber11518 R2I, res. , 2.2MQ, l('NI, : 5% (red, red, green, gold) 50012 insulator for 50011

_18045 R22, 23 pot. , 750KQ linear, dual 50019 insulator for 50018

---., 8046 R24, 25 pot., 250KQ, audio, dual 50021 insulator for 5002010435 R26, res., 150KQ, 1/~, :10% (brown,green,yellow, silver) 51006 pbono plug10414 R28, 29 res., I. 8KQ, 1/~, :10% (brown, grey, red, silver) 53016 knob, outer concentric18048 R30, pot., IMQ, linear, concentric 53017 knob, inner concentric18047 R32, 33, 54 pot. , 500KQ, linear, concentric w/SPST switch 53018 knob, duell concentric

10410 R34, 35, 68, 69 res", 100KQ, l(ZW, %10% (brown, black, yellow, silver) 57000 line cord

10420 R36, res., 3. 3KQ, l(~, %10% (orange, orange, red, silver) 58004 wire, hook...p, thin wall length

10431 R38, res., 470KQ, 1/~, :10% (yellaw, violet,yellow, silver) 58300 spoghetti length

11543 R42, 43 res. , 1.8KQ, l(~, : 5% (brown, grey, red, gald) 58302 spaghetti, heavy length

10412 R48, 49, 50, 51" res. , 330KQ, 1/~, :10% (arange, arOnge, ye ilow, sHver) 58408 cable, 1 conductor length

58410 cable, 4 conductor length

14600 RS6, 57 res., 1650, !)N, % 5% 58412 cable, 3 conductor length

11538 RS8, 59 res., 22KQ, 1/~, % 5% (red, red, orange, gold) 58501 wire, bare length

10851' R61 res., 22KQ, lW, %10"k. (red, red orange, silver) 80057 panel10952 R62 res., 4. 7KQ,~, :10% (yellow, violet, red, silver) 81109 bottom plale

14302 R63 res., 3500, lOW, :10% 81110 brocket, left

19009 R64 pot" 100Q 81111 bracket, right10421 R70, 71 res., 6. 8KQ, 1/~, :10% (blue, grey, red, silver) 81116 bezel60057 switch, Input Selector 81124 chassis60065 switch, Function Selector 81134 shield w/spade bolls62000 switch, slide, DPDT 81144 perfomled screen62002 switch, slide, SPOT 81145 bracket~ Input30021 transformer, power 81146 bracket far DPDT switch32013 T2, 3 transformer, output 81154 shield bottom54516 TB1, terminal board, 5 screw 81903 clamp, wire54002 TB3, terminal strip, lP right w/ground 89207 label, rear apron54001 T84 terminal strip, IP right 89208 label, tube layout54014 TB5 terminal strip, 3P 2 left 89219 label, service54003 TB6,7, 13, terminal strip, 2 past 97300 tube shield54006 TB9, 11, 18 terminal strip, 3P 2 right 97710 Jewel, red54013 TBIO, 19 terminal strip, lP left w/ground 66067 manual af instructions (wired)54008 TBI2, 14 terminal strip, 4 past 66316 manual of instructions (kit)

Jl0

J13

J12

Jl1

';' ... C

l

",,-

, -c4

....c

6...

. C7

~C8

=C

IO- ClI

..:.C

J2-c

13...

.....C

14-C

J5-'J

6,..

.CJ7

-CJ8

--C

19--

C20

.....C

21-C

22-C

23~C

24""

C25

""1:

26

C13

Des

crip

tion

cap.

,pap

er, .

25m

fd20

0V "

'-C

27ca

p.,p

aper

, .25

mfd

200V

~C

28ca

p.,e

lec.

,10

mfd6V

- C2

9co

p.,e

lec., IOmfd,6V

,.-C30

cap.

,elec., 25mfd6V

"'C31

cap.

,elec., 25mfd6V

;;,-C

32ca

p.,d

isc.

, .02

5mfd

GM

V ,C

33ca

p.,d

isc.

, .O

25m

fd,G

MV

-C

34ca

p.,d

isc.

,85

0mm

f,%

10%

""C

35ca

p.,d

isc.

,85

0mm

f,%

10%

.C

36ca

p.,d

isc.

, . 0

027m

fd, %

10%

;"C

37ca

p.,d

isc.

, .00

27m

fd%

1O%

...C

38ca

p.,d

isc.

,60

0mm

f,%

10%

......

c39

cap.

,dis

c., 6

00m

mf%

10%

.....,

('C..u

Jca

p.,d

isc.

, . 02

mfd

%10

% -C

41ca

p.,d

isc.

, .02

mfd

, %10

% ".

.,c42

cap.

, mol

ded,

. Im

fd, .

.uJO

V,%

IO%

-C43

cap.

mol

ded,

. Im

fd, .

.uJO

V,%IQ%- C44

cap.

,dis

c., .

00J2

mfd

,%IO

"k .?

C45

cap.

,dis

c.

, . O

OJ2

mfd

%10

% "C

46ca

p.,m

olde

d , .

I mfd

, ..u

JOV

, %1O

%-C

47ca

p., m

olde

d, .

1 m

fd, .

.uJO

V, %

1O%

-"'C

48co

p., d

isc.

, 15

0mm

f%

10%

'-Jl

cap.

,disc., 150mmf,%

10%

_ca

p.,d

isc., 225mmf%

10%

-:13

cap.

,dis

c., 2

25m

mf%

10%

-~'4

';'';'

Des

crip

tion

cap.

,dis

c., 2

25m

mf

%JO

%

cap.

,dis

c., 2

25m

mf,

%IO

%

cap.

,elec., 50mfd

25V

cap.

,elec., 50mfd,

25V

cap.

,dis

c., 4

7mm

f,%

10%

cap.

, dis

c., 4

7mm

f,%

10%

cap.

,dis

c., .

025m

fd,

GM

Vca

p.,d

isc.

, .02

5mfd

, GM

Vca

p.,d

isc.

, .02

5mfd

, GM

Vca

p.,d

isc.

, .02

5mfd

, GM

Vca

p.,e

lec., 40-40-20mfc!/350- 3

50-4

00V

cap.

, ele

c., 30mfd,

..uJO

Vca

p., e

lec., 3Qmfd,

4OQ

Vca

p., m

olded, .03

mfd

OO

OY

cap.

, dis

c., .

00

12 m

fd, %

10%

cap.

,dis

c.

, .

0012

mfd

%1O

%ca

p.,d

isc., 47mmf,

%JO

%ca

p.,d

isc., 47mmf,

%10

%ca

p., d

isc.

, .O

25m

fd, G

MV

cap.

, dis

c., .

025m

fd,

GM

Vca

p.,d

isc.

, . O

J m

fd,%

l0%

cap.

, di

sc..

. 0Im

fd%

10%

aux A -

chan

nel I

aux B -

chan

nel I

MO

DE

L H

f-

Des

criJ

'tion

~~~

d'l

"JI0

,-:I

ll"J

I2 JI3

..J14 :)15

-116 RJO RlI

R12

RI3

aux A -

chan

nel 2

DUX B -

chan

nel 2

mul

tiple

xm

ic -

chan

nel I

phono - channel I

tope -

chan

nel I

mic - channel.

phono -

chan

nel 2

tope -

chan

nel 2

tope

out

put -

cha

nnel

2to

pe o

utpu

t - c

hann

el I

ac p

awer

res., IMQ.

I/2N

, %

10%

res., JMQ,

I/2N

, %

JO%

res., 1OKD. I/

2N,

%10

%res., 10KD. I/

2N,

%10

%re

s.,

200KD. I/2N, %

5%

res., 200KD.J(2N, % 5%

res.

,2K

n,J(

2N,%

10%

res.

,2.

2KD

.I/2

N, %

10%

res., IMQ,

I/2N

, %

10%

res., JMQ,

I/2N

; %

10%

res., 200KQ, I/

2N,

% 5

%re

s.,

200KD. I/2N, %

5%

res.

7KD

.I/2

N,

%JO

%

R71

4"5

';'

JI4

R59

C31

';'

JI5

R58

C18

C32

R32

R42

';'

'IV

R60

R61

R62

R63

RJ4

RJ5

R16

R17

RJ8

R19

R20

R2l

;:.oR

22R

23R

24

--rt

25 R26

R27

R28

R29

--R

30 R31

-- R

32R

33R

34R

35R

36R

37R

38

Des

cri

tion

Des

crip

tion

5ym

Des

crip

tion

res.

, 4.7KD. I/2N, %

10%

R39

res"

470K

D.

I/2W

,%10

%R

64pat., 1O0Q

res., 9OKD.

I/2N

, %

5%

R..u

Jres., lOKn, J(2W,

%10

%R

65re

s., 3

30K

Q, I

/2W

, %10

%re

s., 9

OK

D. J

(2W

, % 5

%R

4lre

s., 1

0KQ

, I/2

W, %

IO"k

R66

res.

, 330

KQ

, 1/2

W, %

10%

res., lOOKQ, I/2N, % 5%

R42

res.

, 1,8

Kn, I/2W,

% 5

%R

67re

s., 2

.2MQ, I/2W, % 5%

res.

, 100

KQ

,I/2W

, % 5

%R

43re

s., 1

. 8K

D.I

/2W

,%5%

R68

res.

, IO

OK

Q, I

/2W

, :10

%..1

f37C

..1f

378

.1f3

7A ..

1f38

res.

, 68K

Q,

I(2W

, :10

%R

44re

s., 100KQ, I/2W,: 5%

R69

res., 1O0KQ, I

/2N

, :1

0%res., 68KQ, J(

2N,

:10%

R45

res., 100KQ, I/

2N,

R70

res.

, 6, 8

KQ

, I/2

W, :

10%

res.

,2M

Q,J

(2W

,:5%

R46

res.

, 100

KD

. I/2

W,: 5%

R71

res., 6.8

KQ

, 1/2

N, :

10%

pot.

, 750

KQ

line

ar, d

ual

R47

res., lOOKD. I/2W,%

5%

-51

switc

h, in

put s

elec

tor

pot.,

750

KQ

line

ar, d

ual

R48

res., 330KQ, I/2W,

:10%

switc

h, f

unct

ion

sele

ctor

pat., 250KQ, audio, dual

R49

res.

, 330

KD

. I/2

W,:

10%

switc

h, s

lide,

DPD

T

pat., 250KQ, audio, dual

R50

res.

, 33O

KQ

, 1(2

W,:

10%

switc

h, 5

P5T

, por

t of

R32

, re

s., 1

50K

Q,I/

2N, %

10%

R51

res., 330KD.J(2W,

"'10

%-5

5sw

itch,

slid

e, 5

PDT

res., 150KQ,I/2N, "'10%

R52

res.

, 1O

KD

. J(2

W,"

'10%

--V

Itube, 12AX7

res.

, 8K

D.I

/2N

, "'

10%

R53

res., lOKQ, I/

2N,%

10"k

tube, 12AX7

res., I. 8KQ,

I/2N

, %

10%

R54

res.

, 10K

D. I

/2W

,%10

%...

V3

tube, 12AU7

pot., IMQ, linear, concentric

R55

res., lOKn, I/2W,

:10%

tube

, 12AU7

pat., lMQ, linear, concentric

-R56

res., 165Q,

!NI,

.V5

tube, 12AX7

pat.

500K

D.

linea

r, c

once

ntri

c- R57

res., 165Q,

!NI,

5%.

"-...

V6

tube

, I 2A

X7

pot., 500KQ, linear, concentric

R58

res., 22KQ,

I/'M

, % 5

%""

V7

tube

, ELM

res., lOOKD. I/

2N"'

10%

R59

res., 22Kn,

I('M

, % 5

%-V

8tu

be, E

LMre

s., lOOKD. I/

2N,"

'10%

R60

res.

, 68K

Q,

I/2W

, :10

%-V

9tu

be, E

LMre

s., 3

. 3Kn, I/2W,

%JO

%R

61re

s., 2

2KQ

,IW

, :10

%-V

IOtu

be, E

LMre

s., 3

.3K

QI/

2N,"

'lO"k

R62

res.

, 7K

D.

I/'M

, :10

%...

.VII

tube, EZ81

res_

, 470

KQ

, I/'M

, "'IO

%=

-R63

res.

, 350

Q,

lOW, %10%

......

.VI2

tube, EZ8J

DU

AL

14 W

AT

T H

I-

----

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STE

RE

O A

MP.

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AM

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(g)

1958

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20

to.)

TB

21

XV12 -

XV

ll

TB

ll

8 '

'-'.) !'

Fig. 1

-$-

-$-

TB

19

XV

10

XV

9

TB

14

TB

18

TB

5

TB

13

TB

17

TB

4

TB

1

TB

2

XV

8

-Jl1

1213

.J89

10T

B3

XV

6

BE

LOW

CH

AS

SIS

ASS

EM

BL

Y9.

hlg.

1. Mo,nt the 5

wew

te

,mln

all""

"d, T

B2,

'" ,h

awn.

U,e two

#6-3

1 sc

rew

s, tw

o #6

lock

was

hers

and

two

#6-32 hex nuts. Under the lo

ck-

was

her, mount one post rig

ht w

ith g

roun

d te

rmin

al s

trip

, TB

3. U

nder

the

re-

mai

ning

"nut, mount a #6 ground lu

g.

10.

j,

Fig. 1. M

ount

the

fuse

hold

er, X

FI, a

s shown. Use ru

bber

was

her

against the outside of the chassis under the w

ider

par

t of

the

hold

er. S

lide

the

larg

e nu

t ove

r th

e fu

seho

lder

on

the

insi

de o

f th

e ch

assi

s. D

O N

OT

tigh

ten

nut.

11.

Fig. 1. Push a rubber grommet into the 3/8" ho

le n

ext t

o th

e fu

se-

hold

er.

12. ~g

. 1. M

ount

the

conv

enie

nce

outle

t, J1

6, a

s sh

own.

Use

two

#6-

scre

ws,

(tw

o #6

lock

was

her

and

two

#6-3

2 he

x nu

ts.

13. t

h Fig. 1. M

ount

the

30 mfd, 400 V electrolytic ca

paci

tor,

C38

, as

show

n. U

se o

ne #

6-32

scr

ew, o

ne #

610c

kwas

her

and

one

#6-3

2 he

x nu

t. N

ote

dire

ctio

n/of

pos

itive

sid

e.

14.

Fig. 1. M

ount

the

30m

fd, 4

O0V

ele

ctro

lytic

cap

acito

r, C

39, a

ssh

own.

Use

one

#6-

32 s

crew

, one

#6

lock

was

her

and

one

#6-3

2 he

x nu

t. N

ote

direction of positive side. (I

t is

the

reve

rse

of C

38 in

ste

p 13

abo

ve.

15.

(I)

Fig. 1. Mount hu

m b

ucki

ng p

oten

tiom

eter, PM,

as s

how

n. U

se o

ne3/8" lockwasher and one

3/8

hex nut. Between the po

tent

iom

eter

and

the

chassis, uJe one 3/8 pot ~rounding lug. W

hen

tight

enin

g po

tent

iom

eter

, line

up th

e lu~ with terminal 2. The grounding lug will eventually be soldered to

this

term

inal

.

16. (

\4 F

ig. 1

. Mou

nt th

e fo

llow

ing

term

inal

str

ips

as s

how

n. U

se o

ne #

6-sc

re;J

;/)on

e #6

lock

was

her

and

one

#6-3

2 he

x nu

t on

each

. The

term

inal

str

ips

to be mounted in th

is m

anne

r ar

e: th

ree

post

, tw

o le

ft, TB5; two post, TB6;

two post, TB7; two post, 188; three post, two right, TB9; one post6

1eft

with

ground)' TBI0; three post, two right, TBIl; four post, TB12; two post, TB13;

four

pos

~, 1

814;

one

pos

t lef

t, T

B 17; three post, two right, TB 18; on

e po

st le

ftw

ith g

roun

d; T

B19

; on~

pos

t rig

ht w

ith g

roun

d, T

B20

, and

two

post

rig

ht, T

B21

.

Not

e: In

addition to Fig. 1, it

will

be

requ

ired

to r

efer

to F

ig. 6

in th

e fo

l-lo

win

g m

ount

ing

proc

edur

e in

ord

er to

set

tle s

uch

mat

ters

as

orie

ntat

ion

ofterminal boards, keyways on tube sockets, etc. T

he w

irin

g w

hich

com

es la

ter

will

be

grea

tly f

acili

tate

d if

, aft

er m

ount

ing

each

par

t, th

e sy

mbo

l num

ber

ofth

e pa

rt is

writ

ten

on th

e bottom of the chassis next to the pa

rt w

ith a

cra

yon

soft

pen

cil.

v(

Fig. 1. Mount the 9 pin miniature tube socket, XV12, as shown. Use

two #4-40

scr

ews,

two

#4 lo

ckw

ashe

rs, a

nd tw

o #4

-40 hex nuts. Note the

mou

nti j9

dir

ectio

n in

fig

ure

6.2.

(/)

Fig

. 1..

Sim

ilar

to th

e ab

ove,

mou

nt 9

pin

min

iatu

re s

ocke

ts, X

VII

,X

V5,

XV

6, X

V7,

XV

8, X

V9

and

X\f

10. U

se tw

o 14

-40 screws, two #4 lock-

was

hers

, and

two

#4-40 hex nuts on each. In

eac

h ca

se)'

note

the

mou

ntin

gdi

rect

ion

in f

igur

e 6.

3.

(J)

Fig. 1. Mount the 3 terminal input jack strip, J8, 9, 10 as shown.

Use

fou

r #6

-32.

scre

ws,

fou

r #6

lock

was

hers

and

fou

r #6

-32Iiex nuts. Mount

the

3 ho

le in

sula

tor between the ch

assi

s an

d th

e input jack strip. (Fig. 10).

4. (

J, Fig. 1. Mount the 3 te

rmin

al in

put j

ack

stri

p, J

Il)'

12, 13, as shown.

Not

e m

ount

ing

dire

ctio

n in

fig

ure 10 Use fo

ur '6

-32

scre

ws,

fou

r #6

lock

-washers and four

16- 32

he

x nu

ts. M

ount

a 3

hol

e in

sula

tor

betw

een

the

chas

sis

and

the

inpu

t Jac

k st

rip.

(Fi

g. 1

0)

5. . ('~i

9' 1

. Mount the double pole 2 position slide switch, S3, into the

switc

h br

acke

t, as

sho

wn.

Use two #4-40

scr

ews,

two

#4 lo

ckw

ashe

rs a

nd tw

o#4

-40

hex

nuts

.

6. (~

ig. 1

. Mount the sw

itch

brac

ket w

ith th

e sw

itch

(pre

viou

sly

mou

nted

in s

tep

5) o

n th

e ch

assi

s, a

s sh

own.

Use

two

#6-3

2 screws, two

il6

lock

was

hers

and tWo #6-

32 h

ex n

uts.

7. (

~)

Fig

. 1. M

ount

the2

term

inal

tape

out

put j

ack

strip

, J14

, 15,

QS shown.

Use four #6-32 screws, four #6 lockwashers and four #6-32

hex

nut

s.. M

ount

a2

hole

insu

lato

r be

twee

n th

e ch

assi

s an

d th

e ja

ck s

trip

.

8. (

J) Fig. 1. Mount the 5

scre

w te

rmin

al b

oard

, TB

l, as

sho

wn.

Use

two

#6-3

2 sc

rew

s, tw

o #6

lock

was

hers

and

two

#6-32 hex nuts. Under one of the

lock

was

hers

, mou

nt o

ne p

ost r

ight

term

inal

str

ip, T

B4.

17. (

,)' F"

1. Mount the si

ngle

pol

e 2

posi

tion

sl ide switch, S5, as shown.

Use

two

\4.-40 screws, two #4 lockwashers and two #4-40

hex

nut

s.

18. ( Fig. 1. Mount the #6

gro

und

lug

"G" with one #6-32 screw, one

#6 10cKwasher and one #6-32 hex nut. N

ote

posi

tion

of lu

g on

figu

re 6

.

PREWIRING OF SELECTOR SWITCH

Tur

n th

e sw

itch

to it

s m

axim

um c

ount

er-c

lock

wis

e po

sitio

n. T

he s

witc

h is

sho

wn

in th

e fig

ure

from

the

rear

vie

w. T

he e

xact

position of the lugs referred to are

dete

rmin

ed b

y lo

okin

g at

the

switc

h fr

om th

e vi

ew shown in the figure. Each

side of the wafer has been assigned a letter. Each lug ha

s be

en a

ssig

ned

anu

m e

r. T

he lu

g is

ref

erre

d to

by

the

waf

er n

umbe

r an

d lu

g de

sign

atio

n. T

hus

lug lD-3 refers to selector switch S 1,

the

"D"

side

of

the

waf

er (

rear

sid

e of

the econd wafer-side facing you when holding th

e sw

itch

as s

how

n in

the

draw

-in

g) a

nd 3

ref

ers

to th

e lu

g on

this

par

ticul

ar s

ide

of th

e w

afer

.

1. 4) Fig. 2. Cut all leads on tw

o. 0

25m

fd(2

5Kor

25,

000m

mf)

dis

c ca

paci

-to

rs, C

45 a

nd C

46, t

o 3/

4". C

over

eac

h le

ad w

ith a

1/2

" pi

ece

of s

pagh

etti.

Con

nect

C45

from

S I

B-6 (C) to S

1 B

-7 (S 1). C

onne

ct C

46 f

rom

S I

H-7

(C

) to

S 1

~/S

1).

2. (

)) Fi

g. 2. Cut all le

ads

on tw

o 90

KQ

(w

hite

, bla

ck, o

rang

e, g

old)

5%

resi

stor

s, R

15 a

nd R16, to 1/2". Connect R15 fr

om S

lB- 3

(C

) to

SlB

-l (C).

Con

neR

16 f

rom

SlG

-2 (

C)

to S

lG-4

(C

).

3. (

d.Fig. 2. Cut all leads on two 85

0mm

f dis

c ca

paci

tors

, C9

and

C10

, to

3/4"

. Connect C9 fromS1B-3

(S2)

to S

lB- l

(C

). C

onne

ct C

I0 fr

omS

1 G

-2(C

)to

S 1

/-4 (S2).

4.

/J)

Fig. 2. Cut all leads on tw

o 2.

2MQ

(re

d, r

ed, g

reen

, gol

d) 5

% r

esis

tors

,R21 and R67, to 1/2". Connect R21 from SlB-

l (C

) to

S lC

-l (C). Connect

R67

ftm SlF-

2 (C

) to

SlG

-2 (

C).

5. (

~ Fig. 2. Cut all leads on tw

o. 0

027m

fd (

2. 7

Kor

270

0 mmf) disc capaci-

tors

, Cll

and

C12

, to

1/2"

, Cov

er e

ach

lead

with

a 1

/4"

piec

e of

spa

ghet

ti.co

nne

t 111 from SlB-

l (54

) to

SlC

-l (S2). Connect C12 from SlF-2 (S2)

to S 1 G

- (S

4).

6. (' Fig. 2. C

ut a

ll le

ads

on tw

o 10

0KQ

(br

own,

bla

ck, y

ello

w, g

old)

re

sist

ors)

' R17

and

R18

, to

1/2"

. Connect R17 from SlB-

12 (

C)

to S

lC-1

2 (C

).Connect;R18 from SlF-

l (C

) to

SlG

-l (C).

7. ('

Fig. 2. Cut all leads on two 47

mm

f di

sc c

apac

itors

, C43

and

C44

,to

3/

)ft.

Con

nect

C43

fro

m S

1 B

-12

(S2)

to S

lC-1

2 (S2). Connect C

44 fr

omS

1 F-

:Sf)

to

S 1

G-1

(S

2).

8. ( /Fi9. 2. Cut all leads on tw

o 60

0mm

f di

sc c

apac

itors

, C13

and

C14

,to 3/4". Connect C13 frcm SlB-4

(Sl)

to S

lC-4 (C). Connect C14 from

SlG

-5 (

Sl)

to S

lF-5

(C

).

R15 ell

R21

Fig.

2

9. J) Fig. 2. Strip back the outer in

sula

tion

1 1/

2" f

rom

one

end of a 10"

piece of 3 conductor shielded cable. Twist th

e sh

ield

str

ands

toge

ther

and

cover with a 1 1/4" piece of thick spaghetti. Cut the br

own

lead

to 1

1/4

"th

e re

d le

ad to

3/4

" an

d th

e or

ange

lead

to I"

. Strip ba

ck th

e in

sula

tion

1/4"

from the end of each of these leads. C

onne

ct th

e br

own

lead

to S

lB-6

(S2)

,the red lead to S 1

B-8

(S 1), the orange lead to S 18-9

(S 1

) an

d th

e tw

iste

dsh

ield

str

ands

to S

lA-1

0 (C

). O

n th

e ot

her

end

of th

e sa

me

piec

e of

shi

elde

dca

ble,

str

ip th

e ou

ter

insu

latio

n ba

ck 3

/4" .

Twist the shield strands together.

Stri

p k

the

in,u

laH

on 1

/4"

fwm

the

end

af e

ach

af th

e in

ne, c

ondu

ct""

.T

his

en o

f th

e ca

ble

does

not

get

con

nect

ed u

nti I

late

r.

10. i

J IF; g.

2. C

onne

ct o

ne e

nd o

f 0

3 1/

2" p

iece

of b

lock

wi '

e to

5 IA -10 (52).

11. (

Fig. 2. Strip back the outer insulation 1 3/4" from one end of a

l0"

piec

e of

the4

con

duct

or s

hiel

ded

cabl

e. T

wis

t the

shi

eld

stra

nds

toge

ther

and

cove

r w

ith a

1 1

/2"

piec

e of

thic

k sp

aghe

tti C

ut th

e br

own,

red

and

ora

nge

lead

s to

3/4

" ea

ch a

nd th

e ye

llow

lead

to 1

1/4

"S

trip

bac

k th

e in

sula

tion

1/4" from the end of each of thes~ leads. C

onne

ct th

ebr

own

lead

to S

lD-

(SI)

,the

red

lead

toS

1D- 9

(Sl)

,the

ora

nge

lead

toSl

D- 1

0(S1

)and

the

yello

lead

- to

S 1

0-11 (C). C

onne

ct a

1"

piec

eof

bar

e w

ire fr

om S

ID-l

1 (S2) to S 1 E-

(S 1

). C

onne

ct the twisted shield strands' t

o S

lC-6

(C).

On

the

othe

r en

d of

the

U'I same piece of shield cable, strip the outer insulation ba

ck 1

1/4

". Twist the

shield strands. Cut the red, orange, and yellow leads to 1". Cut the sh

ield

stra

nds

to 3

/4".

Strip ba

ck th

e in

su la

tion

1/4"

fro

m th

e en

d of

eac

h of

the

inne

rconductc?rs. This end of the cable does not get connected until la

ter.

12.

N.)

Fig. 2. S

trip

bac

k th

e in

sula

tion

1 3/

4" fr

om o

ne e

nd o

f a

9 1/

2"piece of 3 conductor shield cable. Twist the shield st

rand

s to

geth

er a

nd c

over

wIth

a 1

1/2

" pi

ece

of th

ick

spag

hetti

. Cut

the

brown and red leads to

3/4"

and

the

oran

ge le

ad to

1" .

Strip ba

ck th

e in

sula

tIon

1/4"

from

the

end

of e

ach

of th

ese

lead

s. C

onne

ct th

e or

ange

lead

to S

1 F

-12 (S 1), the red lead to S 1

F-l 0

(Sl)

, the

bro

wn

lead

to S

lF-9

(Sl)

and

the

twis

ted

shie

ld s

tran

ds to

SlF

- 6 (

C).

On

the

othe

r en

d of

the

sam

e pi

ece

of s

hiel

ded

cabl

e, s

trip

the

oute

r in

sula

tion

back

1 1

/4" .

Tw

ist t

he s

hiel

d st

rand

s. C

ut th

e sh

ield

str

ands

, red

lead

and

oran

~e

lead

to 3

/4"

and

the

brow

n le

ad to

1" .

Strip ba

ck th

e in

sula

tion

1/4"

from f~e e?d of each of the inner conductors. This end of the cable does not

get co~n

eqte

d un

til la

ter.

13. ~

~F!~

2. Connect one end of

a 4

1/2

" pi

ece

of b

lack

wire

to S

lF-6

(C).

, /i

V I

14 (V

)\.F

iS

1 F-

6 (Si3)

2. Connect a 1

1/2"

pie

ce o

f bar

e w

ire fr

om S

lC- 6

(S2) to

15. (,) Fig. 2. S

trip

bac

k th

e ou

ter

insu

latio

n 1

1/4"

fro

m o

ne e

nd o

f a

7 1/2" piece of 3 conductor shield cable. Twist the shield strands together,

and

cove

r w

ith a

1"

piec

e of

thic

k sp

aghe

tti. C

ut th

e or

ange

and

red

lead

s to

3/4"

and

the

brow

n le

ad to

1" .

Strip the insulation ba

ck 1

/4"

from

this

end

of

each

of t

hese

lead

s. C

onne

ct th

e or

ange

lead

to S

IH-I

0 (S

1),

the

red

lead

toSl

H-9

(S1)

, the

bro

wn

lead

to S

lH- 7

(S2)

and

the

shie

ld s

tran

ds to

S1H

- ll (C).

On

the

othe

r en

d of

the

sam

e pi

ece

of s

hiel

ded

cabl

e, s

trip

the

oute

r In

sula

tion

back

3/4

". Twht the sh

ield

str

ands

toge

ther

. Str

ip b

ack

the

insu

latio

n 1/

4"from the end 9feuch of the inner conductors. This end of the cable does not

get conne

~'d

unti

I la

ter.

16. ~.

. ~ rg

. 2. Connect one end of a

2" p

iece

of

blac

k w

ire

to S

1 H

-l1 (S2).

17. t

d Fig. 2.

- C

onne

ct o

ne e

nd o

f a

2 1/

2" piece of grey wire to S 18-

11 (

S 1)

.

18. V

) Fig. 2. O

n on

e en

d of

a 4

1/2

" pi

ece

of s

ingl

e co

nduc

tor

shie

lded

cabl

e, s

trip

the

oute

r in

sula

ting

back

1/2

" . Twist th

e sh

ield

str

ands

toge

ther

and cut off: St

rip

back

the

inne

r in

sula

tion

1/4"

and

con

nect

to S

18- 5

(Sl

).O

n th

e ot

her

end

of th

e sa

me

piec

e of

shi

elde

d ca

ble,

str

ip b

ack

the

oute

r in

-su

latio

n3/4

" ; T

wis

t the

shi

eld

stra

nds

toge

ther

. Str

ip b

ack

the

inne

r in

sula

tion

1/4"

. Jhis end of the cable does not get co

nnec

ted

until

late

r.

19.

(v)

fig.

2. C

onne

cton

eend

ofa5

"pi

eceo

fbro

wnw

iret

oS1D

- 7(S

1).

20. (

'Fig

. 2. Connect one end of a 3"

pie

ce o

f br

own

wir

e to

SlF

- 8 (

SI)

.

21. (

I, Fi

g. 2. O

n on

e of

a 4

" pi

ece

of s

ingl

e co

nduc

tor

shie

lded

cab

le,

stri

p th

e ou

ter

insu

late

d ba

ck 1

/2". Twist the sh

ield

str

ands

toge

ther

and

cut

off. Strip back the inner in

sula

tion

1/4"

and

con

nect

to S

lG-6

(Sl)

. On

the

other end of the same piece of cable, st

rip th

e ou

ter

insu

latio

n ba

ck 3

/4"

Twist the shield strands together. St

rip

back

the

inne

r in

sula

tion

1/4"

. This

end

of t~

e ca

ble

does

not

get

con

nect

ed u

ntil

late

r.

22. (

/) F

ig. 2. C

onne

ct o

ne e

nd o

f a

3" p

iece

of

grey

wir

e to

S 1

G- 1

2 (S

1).

23. (

~/F

ig. 2

. Connect on

e en

d of

a 5

" pi

ece

of g

rey

wir

e to

SlD

- 3 (

Sl)

and

one

end

of a

5"

piec

e of

yel

low

wir

e to

SlE

-4 (Sl). Twist the two leads

toge

ther

. .

24. (

v)

Fig

. 2. C

onne

ct o

ne e

nd o

f a 4

1/2

" pi

ece

of g

reen

wir

e to

S 1

C-2

(S 1)

and one end of a 4 1/2" piece of blue wire to

S lC

-4 (S2). Twist the two

lead

s to

g/et

her.

25 (vfFi9. 2. Connect one end of a

5 1/

2" p

iece

of b

row

n w

ire to

S 1

E- 3

(S 1)

and

one

end

of a

5 1

/2"

piec

e of

whi

te w

ire

to S

lF- 5

(S2). Twist the two

leads together.

TB

16 XIl

R32

R33

R30

R31

R23

R22

XV

3

R24

R25

(ii)

J)

CJI

~

=$=

J123

4J5

67 I 'X

V2

XV

1

XV

4

(37

TB

I5

Fig.

TOP OF CHASSIS ASSEMBLY

11. (

\.fi F

ig. 3

. On

the

pow

er tr

ansf

orm

er, 1

1, c

ut b

oth

gree

n le

ads,

the

red-

yello

w le

ad a

nd th

e w

hite

lead

to 2

1/2

"; b

oth

yello

w le

ads

to 3

1/2

"; b

oth

red

lead

s an

d bo

th b

lack

lead

s to

5 1

/2" .

Mou

nt th

e po

wer

tran

sfor

mer

as

show

n.P

ositi

on s

o th

at th

e gr

een

and

yello

w le

ads

face

the

cent

er of the chassis (see

figure 6). Use three #8 lockwashers and three #S-32

hex

nut

s on

thre

e of

the

scre

ws.

On

the

four

th s

crew

, use

one

#S

grou

ndin

g lu

g an

d on

e #S

-32

hex

nut.

12.

(V)

Fig. 3. O

n th

e ou

tput

tran

sfor

mer

, T2,

cut

the

blac

k, b

row

n, g

reen

,or

ange

and

yel

low

lead

to 4

". C

ut th

e bl

ue, r

ed a

nd b

row

n-ye

llow

lead

to 3

"M

ount

the

outp

ut tr

ansf

orm

er a

s sh

own.

Pus

h th

e re

d, b

lue

and

brow

n-ye

llow

lead

s th

roug

h ho

le "Z" nearest the power transformer m

ount

ed in

ste

p 11

. Pus

hth

e ot

her

lead

s th

roug

h th

e ho

le "

. Use four #S-

32 s

crew

s, o

ne #

S lo

ck-

was

her,

two

#S g

roun

d lu

gs, a

nd o

ne c

able

cla

mp.

Sec

ure

each

with

a #

S-

hex nut. SI ide all le

ads

from

hol

e " Y" under the cable clamp before tig

hten

,..ing. Se

7'Fi

g. 8

.13

. Fig. 3. O

n ou

tput

transformer, T3, cut the orange, yellow, red

and

gree

n le

ads

to 6

". Cut th

e br

own

lead

to 5

". Cut the blue and brown-

yello

w le

ads

to 4

". Push the red, blue and brown-ye

llow

lead

s th

roug

h ho

le. Push the other leads through hole "

. Use four #S-

32 s

crew

s, th

ree

#S lo

ckw

ashe

rs a

nd fo

ur #

S-32 hex nuts. Under two of the lockwashers, mount

the shield. U

nder

the

nut w

ithou

t the

lock

was

her,

mou

nt th

e ca

ble

clam

p. O

nth

e to

p of

the

chas

sis,

mou

nt a

cab

le c

lam

p un

der

one

of th

e sc

rew

hea

ds. D

ono

t tig

hten

this

scr

ew y

et. R

un all leads from hole "

unde

r th

e ca

ble

clam

punder the chassi~ in the direction sh

own

in fi

gure

S. T

ight

en a

ll nu

ts e

xcep

tth

e on

e h9

1din

g th

e cl

amp

on th

e to

p si

de o

f th

e ch

assi

s.14

. (u

.y

Fig. 3. M

ount

the

elec

trol

ytic

can

cap

acito

r, C

37, a

s sh

own.

Infigure 6. note the direction of the half m

oon,

squ

are

and

tria

ngle

nea

r lu

gs to

dete

rmin

e di

rect

ion

of m

ount

ing.

Ins

ert t

he m

ount

ing

tabs

into

the

slot

s in

the

chassis and twist the tabs so

mew

hat l

ess

than

a q

uart

er tu

rn. D

O N

OT

twis

tthe tabs e?,cessively or they will shear off. S

olde

r th

e ta

b w

ithou

t a h

ole

tothe cha~r.is

at i

ts s

lot.

15. ~,~ Fi~. 3. Insert the pilot light, 11, into the pilot light assembly, XI1.

Scre

w th

e as

sem

bly

to th

e ch

assi

s as

sho

wn

usin

g on

e #6

-32

scre

w, o

ne #

6 lo

ck-

washer an~ one #6-32 hex nut. Tighten the mounting screw and nut after the

pilo

t li 9

~f h

as b

een

lined

up

with

the

hole

in th

e fr

ont c

hass

is a

pron

.16

. (\

V

Fig. 3. M

ount

the

inpu

t bra

cket

as shown. Use two #6-32 screws,

two

#6 lo

ckw

ashe

rs a

nd tw

o #6

-32

hex

nuts

. Fol

low

arr

ows

to m

ount

ing

hole

s.17

. (\ )

/Fig

. 3. M

ount

the

four

term

inal

inpu

t str

ip, J

1,

4, as shown.

Use fdJr #6-32

scr

ews,

fou

r #6

lock

was

hers

and

fou

r #6

-32 hex nuts. Use a

four

hol

e il'

1sul

ator

bet

wee

n th

e in

put s

trip

and

the

inpu

t bra

cket

.IS. ( 1/F

ig. 3

. Mou

nt th

e th

ree

term

inal

inpu

t str

ip, J

5,, 7

, as

show

n. U

sefo

ur #

6-31

scr

ews,

fou

r #6

lock

was

her

and

four

#6-

32 hex nuts. Use a three

hole

inU

ato

r be

twee

n th

e in

put s

trip

and

the

inpu

t bra

cket

.19

. (\

) F

ig. 3

. Mou

nt th

e ca

ble

clam

p on

the

uppe

r le

ft h

and

corn

er o

f th

e fr

ont

apron~ s shown. Use one #8-

32 s

crew

, one

HS

lock

was

hera

nd o

ne #

S-3

2 he

x nu

t.

1. (~g

. 3. Mount th

e 9

pin

min

iatu

re tu

be s

ocke

t with

shi

eld

supp

ort,

XV

2, fr

om th

e to

p of

the

chas

sis.

Use two #4-40 screws, two #4 lockwashers,

and

two

#4-4

0 he

x nu

ts. .

Not

e m

ount

ing

dire

ctio

n In

fig

ure

6.2.

(\ ~

Jig

. 3. Similar to the above, m

ount

the

9pin

min

iatu

re tu

be s

ock

etw

ithsh

iele

t---

sup

port, XVl and XV3, from the top of the chassis. Use two #4-

screws, two~

#4 lo

ckw

ashe

rs a

nd tw

o #4

-40 hex nuts on each. Note mounting

dire

ctio

n~ig

ure

6.3.

("

Fig. 3. Similar to

the

abov

e, m

ount

the

9 pi

n m

inia

ture

tube

soc

ket

with

shi

eld

supp

ort,

XV

4, fr

om th

e to

p of

the

chas

sis.

Use

two

#4-40 screws,

two

#4 lo

ckw

ashe

rs a

nd tw

o #4

-40

hex

nuts

. Not

e m

ount

ing

dire

ctio

n in

figu

re6. Un~erone of th

e lo

ckw

ashe

rs, u

nder

the

chas

sis,

mou

nt I

J tw

o po

st r

ight

term

i":~1 strip, TB 15.

4. ('1 Fig. 3. M

ount

the

dual

con

cent

ric tr

eble

con

trol

pot

entio

met

er w

ithon-off switch, R32, R33, S4

, as

show

n. Slide the locating lug on the poten-

tiom

eter

into

the

smal

l hol

e ad

j ace

nt to

the

mou

ntin

g ho

le. U

se one 3/Slock-

washer aJld one 3/S hex nut (stock# lS047).

5. (01 Fig. 3. M

ount

the

dual

con

cent

ric

bass

control potentiometer, R30,

R31

, as

show

n. S

lide

the

loca

ting

lug

on th

e po

tent

iom

eter

into

the

smal

l hol

ead

jace

nt to

the

mou

ntin

g ho

le. U

se one

3/S

lockwasher and one

3/8

hex

nut.

(sto

ck#

JS04

S)6.

(L.

) F

ig. 3

. Mou

nt th

e du

al 2

50K

Q le

vel c

ontr

ol p

oten

tiom

eter

, R24

, R25

,as

sho

wn.

Slid

e th

e lo

catin

g lu

g on

the

pote

ntio

met

er in

to th

e sm

all h

ole

ad-

jacent to the mounting hole. Use one 3/8 lockwasher and one

3/S

hex

nut.

(stock# )SO46)

7.

(\y

Fig. 3. M

ount

the

dual

750

KQ

focus control potentiometer, R22, R23

into

the

smal

l hol

e ad

jace

nt to

the mounting hole. Use one 3/SIockwasher and

one 3

~ex nut (stock# 18045).

8. (

ig. 3

. Mou

nt th

e fu

nctio

n se

lect

or s

witc

h, S

2, a

s sh

own.

SI i

de the

locati g lug on the switch into the small hole adjacent to the m

ount

ing

hole

.Use one 3/S lockwasher and one

3/8 hex nut.

9. (

) Fi

g. 3. M

ount

the

inpu

t sel

ecto

r sw

itch,

Sl,

as s

how

n. Slide the

loca

ting

lug

on th

e sw

itch

into

the

smal

l hol

e ad

jace

nt to

the

mou

ntin

g ho

le.

Use one

3/S

10ckwClsher and one 3/

8 he

x nu

t.10

. (\

.) F

ig. 3

. Mou

nt th

e tw

o po

st te

rmin

al s

trip

, TB

16,

as

show

n. U

se o

ne#6

-32 screw, one #6 lockwasher and one #6-

32 h

ex n

ut.

NO

TE

: Before the next step, re

mov

e th

e fu

seho

lder

mou

nted

in s

tep

10, o

npa

ge 3

C. A

fter

com

plet

ing

step

lIon

this

. pag

e (p

age

7C),

rem

ount

the

fuse

-holder as indicated in step 10 on page 3C.

Thi

s tim

e, tighten the nut but do

not tighten too much or holder will crack. N

ext,

cont

inue

with

ste

p 12

0n th

ispa

ge (

page

7C

), a

nd f

ollo

w th

e no

rmal

seq

uenc

e of

ste

ps.

R32

R33

ffi10

\0 0

eOe

Top

Shi

eld

eOe

~IC

J~iii

eOe

eOe

0 eOe

eOe

Fig.

4

TOP OF

CH

AS

SIS

WIR

ING

1.

(v)

Fig. 4. Run the four conductor cable from switch wafer, SlD an

d th

eth

ree

cond

ucto

r ca

ble

from

sw

itch

waf

er, S

1 F

alo

ng th

e to

p of

the chassis. Run

thes

e un

der

the

cabl

e cl

amp

mou

nted

on

the

outp

ut tr

ansf

orm

er, T

3, a

nd ti

ghte

nth

is s

crew

. Con

nect

the

oute

r sh

ield

from

the

four

con

duct

or c

able

to Jl, 2, 3,

6 (C

).; The four leads from the cable are co

nnec

ted

as fo

llow

s:(i

f brown to Jl,

1 (Sl)

CY

ora

nge

to J

l, 2,

3,

5 (S

l)(\

:) r

ed to

J1, 2,

3 (Sl)

() ye

llow

to J

l, 2,

3,

7 (S

l)

2. ("

') F

ig. 4

. Connect a 1" piece of black wire from J 1

6 (S2) to

J 1,

4 (C

).

3. () Fig. 4. Connect a 1" piece of bl

ack

wir

e fr

om J

l, 2,

3,

4 (S2) to

2, 3

4;"2 (Sl).

4. ~/

Fig. 4. Connect a 1 1/2" piece of bare wire covered with a I" piece

of s

pagh

etti

from

J5,

6, 7

-4 (

C)

to J

5 , 6

, 7-1

(S

1).

5.

(V)

Fig. 4. Connect the ou

ter

shie

ld fr

om th

e th

ree

cond

ucto

r ca

ble

from

waf

er S

1 F to J5,

6, 7

-4 (S2). The three leads from the cable are co

nnec

ted

asfo

llow

s:

(,-1

bro

wn

to J

5, 6

2 (S 1)

lJ/r

ed to

J5,

6, 7

-3 (S 1)

('\)/

6ran

ge to

J5,

6, 7

-5 (Sl)

6. tJ

f Fig. 4. Pu

sh th

e tw

iste

d gr

een

and

blue

lead

s (o

rigi

natin

g at

S lC

-an

d S

lC- 4

res

pect

ivel

y) th

roug

h th

e ho

le "

S" in

the

fron

t pan

el b

etw

een

the

two

rota

ry s

witc

hes

and

behi

nd th

e sl

ide switch)' S3.

7. (

\ ,,)

Fig

. 4. R

un th

e tw

iste

d w

hite

and

bro

wn leads (originating at S

and

51 E

- 3 r

espe

ctiv

ely)

alo

ng th

e ch

assi

s as

sho

wn.

Pus

h le

ads

tt,ro

ugh

hole

S" in

the

fron

t pan

el b

etw

een

the

two

rota

ry s

witc

hes

and

behi

nd th

e sl

ide

switch, S3.

S. '

(v)'

Fig

. 4. Cut all leads on two 6. SK

Q (

blue

, gre

y, r

ed, s

ilver

) re

sist

ors,

R70 and R71, to 1/2"

. Con

nect

one

res

isto

r from S2B-

2 (C

) to

S2B

-3 (

S 1)

and

the

seco

nd r

esis

tor

from

S2B

-9 (

S 1)

to S

2A-S

(C

).

9. (

) Fi

g. 4. C

onne

ct th

e ye

llow

lead

(fro

m th

e tw

iste

d ye

llow

and

gre

yle

ads

orig

inat

ing

at S

lE-4

and

SlD

- 3 r

espe

ctiv

ely)

to S

2A- S(S2) and the grey

lead from)he pair to S2B-2 (S2).

10. (l(Fig. 4. Push al

l the

rem

aini

ng lo

ose

lead

s fr

om in

put s

elec

tor

switc

h,S

l thr

ough

the

rect

angu

lar

hole

bel

ow th

e sw

itch.

11. (\)/Fi

g. 4

. Con

nect

a 2

" pi

eceo

fgre

ywir

efro

mS2

B-4

(C)t

oR22

-4(S

l).

12. (

) Fig. 4. Connect a 3 1/2" piece of yellow wire from S2B-

7 (S

1)

toR

23- 3

(S

1).

13. (

\) f

ig. 4

. Con

nect

a 3

" pi

ece

of y

ello

w w

ire fr

om R

23- 2(Sl)to R25-1 (Sl).

14. (

J),F

ig.

4. C

onne

ct a

3"

piec

e of

gre

y w

iref

rom

R22

- 5(Sl) to R24-4

(Sl).

15. (

\/) F

ig. 4

. Con

nect

one

end

of

a 17

" pi

ece

of y

ello

w w

ire

to X

I1- 1

(S

1)and one end of a 16" piece of brown wire to XI1-2

(S 1

). T

wis

t the

two

lead

stogether. Run along the front of the chassis and under the cable cl

amp,

as

shown. Push'

unso

lder

ed e

nd th

roug

h ho

le "

V"

to th

e bo

ttom

of

the

chas

sis.

16. (

~. 4

. Connect a l"

piec

e of

bare

wire

from

R33

- 7(Sl) toR32-

S (

C).

17. (0 Fi

g. 4

. Con

nect

one

end

of

a 4

1/2"

pie

ce o

f bl

ack

wir

e to

R32

-S (S2).

Pus

h th

e pther end through hole "

Uti

lS. (

0Fig

.4.

Con

nect

a 2

" pi

ece

of g

rey

wire

from

S2B

- 10

(S 1

) to

S2B

- 4(S

2).

...

R33 PC

l

R32

TB

16

Fig. 5

Tw

o pr

inte

d ci

rcui

t pla

tes

are

sold

ered

to th

e du

al p

oten

tiom

eter

s. O

ne p

rinte

dci

rcui

t pla

te, P

C 1 gets co

nnec

ted

to th

e po

tent

iom

eter

s, R

31 a

nd R

33 n

eare

stth

e fr

ont a

pron

. The other printed circuit plate, P

e2 g

ets

conn

ecte

d to

the

potentiometers R30 and R32 mounted on the rear of the front potentiometers.

To

keep

the

draw

ings

cle

ar a

nd s

impl

e, th

e fir

st p

late

, PC

1 is

mou

nted

and

wir

ed in

fir

st, w

ith th

e as

soci

ated

con

nect

ions

. The

rea

r po

tent

iom

eter

issh

own

dotte

d in

.B

elow

this

dra

win

g, th

e se

cond

pla

te, P

C2

is m

ount

ed a

nd w

ired

in th

e ci

rcui

tw

ith it

s as

soci

ated

con

nect

ions

. In

this

dra

win

g, th

e front potentiometer

, R31

is shown dotted in. All th

e co

nnec

tions

mad

e pr

evio

usly

for PC 1 are not sh

own

in th

is d

raw

ing

to a

void

con

fusi

on.

We

now

wir

e th

e ci

rcui

t usi

ng th

e fir

st p

rinte

d pl

ate,

PC

l, us

ing

the

uppe

rdr

awin

g.

1. (

Fig. 5. S

trip

the

oute

r in

sula

tion

back

1/2

" on

one

end

of a

811

piec

e of

sin

gle

cond

ucto

r sh

ield

ed c

able

. Tw

ist t

he s

hiel

d st

rand

s to

geth

er a

ndcut off. Strip the inner insulation ba

ck 1

/4" ,

Connect this end to R33-4

(C).

... O

n th

e ot

her

end

of th

e sa

me

piec

e of

cab

le, s

trip

the

oute

r in

sula

tion

back

... 3

/4" .

Tw

ist t

he s

hiel

d st

rand

s to

geth

er. S

trip

the

inne

r in

sula

tion

back

1/4

"Pu

sh th

is e

nd o

f th

e ca

ble

thro

ugh

hole

"T" to the bottom of the ch

assi

s.

2. (

\J Fi

g. 5. C

onne

ct o

ne e

nd o

f a

711 piece of brown wire to R33-

6 (C

).Push the other end through ho I e

liT

II .

6. (IA Fig. 5. Connect on

e en

d of

a 1

0" p

iece

of

grey

wir

e to

the

swi~

chS4

-9 (S l)

whi

ch is

mou

nted

on

the

rear

of

the

dual

treb

le c

ontr

ol p

oten

tiom

eter

s.C

onne

ct o

ne e

nd o

f a

14"

piec

e of

bla

ck w

ire

to S

4-10 (S 1). T

wis

t the

two

lead

s to

geth

er a

nd p

ush

the

unso

lder

ed e

nd th

roug

h ho

le "V" to the bottom of

the chassis.

3. (

v) Fig. 5. O

n th

e pr

inte

d ci

rcui

t pla

te)'

Pel

, cut leads

112

#3 a

nd #

6to 1/2"

. Cut leads

111

#5 a

nd #

7 to

2".

Cut

dead

#4

to 1

1/2

". Connect lead

*6 to R31-3

(C),

lead

#3

to R

31-2 (C) and lead #2 to R31-

1 (S

1). C

over

lead

s#1 and #7 each with a 1

3/4"

pi

ece

of s

pagh

etti.

Con

nect

lead

#1

to R

33-6

(S2

)and lead

117

to R33-4 (S2). Cover lead #4 w

ith a

1 1

/4"

piec

e of

spa

ghet

tiand connect to R33-5 (Sl). Cover lead #5 with a 1

3/4"

pi

ece

of s

pagh

etti

and conflect to TB 16-

1 (C

).

4. (Ii Fig. 5. Cut both leads on a . 0

012m

fd (

1. 2

K o

r 12

00m

mf)

dis

c ca

paci

-tor, C19)' to 1/211. Connect from R31-

2 (S

2) to

R31

-3 (S2).

The

wiri

ng o

f the

fron

t pot

entio

met

ers

and

the

prin

ted

circuit plate Pe 1, has

now been completed. R

efer

ring

to th

e se

t bel

ow th

e m

ain

draw

ing,

wire

the

rear

sec

tjon

of th

e du

al c

once

ntri

c po

tent

iom

eter

, with

the

prin

ted

circ

uit

plate, !1t2, as follows:

7.

Fig. 5. Cut the leads #2

#3 and

116

on p

rint

ed c

ircu

it pl

ate

PC2,

to1/

2". On the same printed circuit plate Pe2, cut leads

111

and

#7 to

2 1

/4"

lead

#5

to 1

1/4

" an

d le

ad #

4 to

1 3

/4". Connect lead #6 to R30-3 (C), lead

#3 to

R30

-2 (

C)

and

lead

#2

to R

30-1

(S 1). C

over

lead

s #1 and #7 each with

a 2"

pie

ce o

f spa

ghet

ti. C

onne

ct le

ad#7

toR

32-1

(C)and lead #lto R32-

3(C

).C

over

lead

#4

with

a 1

1/2

" pi

ece

of s

pagh

etti

and connect to R32-2

(Sl).

Cov

er Ijbd #5 with a 1" piece of spaghetti and connect to TB 16-2 (S2).

8. ('YFig. 5. Cut both leads on a

. 001

2mfd

(1.

2K

or

1200

mm

f) d

isc

capa

ci-

tor,

C20

, to

1/2"

. Connect from R30-

3 (S

2) to

R30

-2 (S2).

9. (v) Fig. 5. C

onne

ct o

ne e

nd o

f an

8"

piec

e of

gre

y w

ire

to TB 16-

1 (S

2).

Push

the/

othe

r en

d th

roug

h ho

le "

T"

to th

e bo

ttom

of

the

chas

sis.

10. (0 lig. 5. Connect one end of a 4" pieceof yellow wire to R32-3 (S2).

Push

th1o

ther

end

thro

ugh

hole

"U

" to

the

botto

m o

f th

e ch

assi

s.

11. (

.1)-

Fig

. 5. S

trip

the

oute

r in

sula

tion

back

1/2

" on one end of a 5"

piec

e of

sin

gle

cond

ucto

r sh

ield

ed c

able

. Tw

ist t

he s

hiel

d st

rand

s to

geth

er a

ndcut off. Strip the inner insulation

back

1/

4"C

onne

ct th

is e

nd to

R32

-1 (S2).

On

the

othe

r en

d of

the

sam

e pi

ece

of c

able

, str

ip th

e ou

ter

insu

latio

n ba

ck3/

4". Twist the shield strands together. Strip the inner insulation ba

ck 1

/4-

Push this end of the cable th

roug

h ho

le "

U"

to th

e bo

ttom

of

the

chas

sis.

5. (

v) Fig. 5. C

onne

ct o

ne e

nd o

f a

5 1/

2" p

iece

of green wire to TB 16-

(C)

Push

the

othe

r en

d th

roug

h ho

le "

T"

to th

e bo

ttom

of

the

chas

sis.

R64

XV

7

XV

5

;:; TB 10

XV

ll

TB

6

XV

12

-$-

XI1

J 14

15 T

B4

XV

8T

B3

TB

20T

B2

TB

5X

V10

J89

10, I

J111

2. J .

TB

1J1

6T

B9

LC

D

Fig.

6

TB

7T

B8

XV

3T

B21

TB

llT

B19

TB

18

T B

'l5X

V4

XV

6

TB

13

XV

2

TB

17

XV

9 TB 14

C:3

7

XV

1

TB

12

BE

LOW

CH

AS

SIS

WIR

ING

I.

jy;g

,

6. F'om th

e po

we'

t,on

,ro,

mer

, n,

conn

ect o

ne g

'oon

leod

toR

64- l

(C) and the other green lead to R64-3

(C).

2.

Fig. 6. Fold the po

t gro

undi

ng lu

g ov

er te

rmin

al #

2 on

R64

. Sol

der

this

lug

to th

is te

rmin

al R

64- 2

(S1).

3. (

/Fi9

. 6. Connect on

e en

d of

a 4

" pi

ece

of y

ello

w w

ire to

R64

- 3 (C)

and one endofa 4"piece of brown wire to R64-1(C). Twist the wireslogether.

Con

nect

t~e

othe

r en

d of

the

yello

w w

ire to

XV

7-4

(C)

arid

the

othe

r en

d of

the

broW

j/wir

e to

XV

7-5

(C).

4. ,

('-/ F

ig. 6

. C

onne

ct o

ne e

nd o

f a

5" p

iece

of

yello

w w

ire

to R

64~

(S3)

and

one

end

of a

5"

piec

e of

brown wire to R64-l (S3). Twist the wires to-

geth

er. C

onne

ct th

e ot

her

end

of th

e ye

llow

wire

to X

VS

- 4 (C) and the other

end

of th

e br

own

wire

to X

VS

-5 (

C).

and

one

end

of a

5"

piec

e of

bro

wn

wir

e to

XV

I0- 5

(S2). Twist the wires and

run

alon

g th

e ch

assI

s as

sho

wn.

Con

nect

the

othe

r en

d of

the

yello

w w

ire to

XV

9-4

(C)

and

the

othe

r en

d of

the

brow

n w

ire to

XV

9-5

(C).

12. (

\.....

Fig

. 6. C

onne

!=t o

ne e

nd o

f a 4

" pi

ece

of y

ello

w w

ire to

XV

9-4 (C)

and

one

end

of a

5"

piec

e of

bro

wn

wir

e to

XV

9-5(C). Twist the wires and run

alon

g th

e ch

assi

s as

sho

wn.

Con

nect

the

othe

r en

d of

the

yello

w w

ire

to X

V6-

4(C

)and the

ojhe

r en

d of

the

brow

n w

ire

to X

V6-

9 (C

).

13. (/

Fig. 6. Connect one end of a 7" piece of

yel

low

wire

to X

V9-

4 (S3)

and

one

end

of a

7"

piec

e of

bro

wn

wire

to X

V9-

5 (S3). Twist the wires and

run

alon

g t~

e ch

assi

s as

sho

wn.

Con

nect

the

othe

r en

d of

the

yello

w w

ire to

XV

2-4

(YJ

and

the

othe

r en

d of

the

brow

n w

ire

to X

V2-

9 (S

1).

" i

/ /

14. (

)) J

ig. 6

. Con

nect

a 1

/2"

piec

e of

bar

e w

ire fr

om X

V2-

4 (S

2) to

XV

2-5 (Sl).

15. (

0 F

ig. 6

Con

nect

a 1

/211

pie

ce o

f bar

e w

ire fr

om X

V6-

4(S2

) to

XV

6-5(

C).

16. UJ Fig. 6 C

onne

ct o

ne e

nd o

f a 4

1/2

" pi

ece

of b

row

n w

ire

to X

V6-

9 (S2)

and

one

end

of a

3"

piec

e of

yel

low

wir

e to

XV

6-5 (S2). Twist th

e w

ires

and

run along the ch

assi

s as

sho

wn.

Con

nect

the

oth~

r en

d of

the

yello

w w

ire

toX

V4-

4 (C

) an

d th

e ot

her

end

of th

e br

own

wire

toX

V4-

9(C

).

17. (~9

.6. C

onne

ct o

ne e

nd o

f a 2

1/2

" pi

ece

of y

ello

w w

ire to

XV

4-4 (C)

and one end of a 5 1/2" piece of br

own

wire

to X

V4-

9 (S2). Twist the wires

and

run

alon

g th

e ch

assi

s as

sho

wn.

Con

nect

the

othe

r en

d of

the

brow

n w

ireto

XV

l-9

(S 1

) an

d th

e ot

her

end

of th

e ye

Ilo

w w

i re

to X

Vl-4 (C)

lS. (

\)iF

ig. 6

Con

nect

a 1

/211

pie

ce o

f ba

re w

ire

from

XV

l-4

(S2)

to X

Vl-

5(S

1).

(~/i9

' 6.

Con

nect

a 1

/2"

piec

e of

bar

e w

ire fr

om X

V4

-;- 4

(S3)

to X

V4-

5(Sl

).

20. (

'1)

Fig.

6. C

onne

ct o

ne e

nd o

f on

e 3

1/2"

pie

ce o

f ye

llow

wire

to X

V12

4 (C

) an

d on

e en

d of

a s

econ

d 3

1/2"

pie

ce o

f yel

low

wire

to X

V12

- 5 (

Sl).

Tw

ist t

he w

ires

and

run

alon

g th

e ch

assi

s as

sho

wn.

Con

nect

the

othe

r en

d of

one

of th

e ye

llow

wir

es to

XV

l1- 4

(C

) an

d th

e ot

her

end

of th

e re

mai

ning

yel

low

wire

to X

V11

- 5 (C

).

21. (

\~ Fig. 6. From the power transformer, Tl, tw

ist t

he y

ello

w le

ads

and

run

alon

g th

e ch

assi

s as

sho

wn.

Con

nect

one

lead

to X

V11

- 4 (

S2)

and

the

othe

rle

ad to

XV

11- 5 (S2).

5. (\

!) Fig.. 6

. Con

nect

one

end

of

a 4

1/2"

pie

ce o

f br

own

wir

e to

XV

7-...

. (S

2) ~

nd o

ne e

nd o

f a 3

1: p

iece

of y

ello

w w

ire to

XV

7-4 (S2). Twist the leads

toge

ther

. ,C

onne

ct th

e ot

her

end

of th

e ye

llow

wir

e to

XV

5-4

(C)

and

the

othe

rend of the brown wire (r

unni

ng a

long

the

chas

sis

as s

how

n) to

XV

5-9

(C).

6.

~I

Fig. 6. Run the twisted pair of br

own

and

yello

w w

ires

fro

m h

ole

"along the ch

assi

s as

sho

wn.

Con

nect

the

brow

n le

ad to

XV

5-9

(C)

and

the

yello

w le

pd to

XV

5-4

(C).

7. ( ~itg. 6. Connect a 1/2" pi

ece

of b

are

wire

from

XV

5-4

(S3)

to X

V5-

5 (C

).

S. (

\)!

Fig.

6. C

onne

ct o

ne e

nd o

f a

4" p

iece

of

yello

w w

ire to

XV

5-5 (S2)

and

one

end

of a

5 1

/2"

piec

e of

bro

wn

wire

to X

V5-

9 (S3). Twist the two

wir

es a

nd r

un a

long

the

chas

sis

as s

how

n. C

onne

ct th

e ot

her

end

of th

e ye

llow

wir

e to

iX~3

- 4(C

) an

d th

e ot

her

end

of th

e br

own

wire

to X

V3-

9 (S1).

9. (iF

f,. 6

. Con

nect

0 1

/2"

p; e

c. 01 b"'e w; ,. "o

m X

V3-

4 (5

2) to

XV

3-5

(5 I

),

10. (1 Fig. 6. Connect one end of a

6" p

iece

of b

row

n w

ire to

XV

S- 5 (S2)

and

one

end

of a

6"

piec

e of

yel

low

wir

e to

XV

S-4 (S2). Twist the wires and

run

alon

g th

e ch

assi

s as

sho

wn.

,Con

nect

the

othe

r en

d of

the

brow

n w

ire

toX

VI0

- 9 (

C)

and

the

othe

r en

d of

the

yello

w w

ire

to X

VI0

-4 (

C).

11.

J)

Fig. 6. Connect"

one

end

of a

5"

piec

e of

yel

low

wi ~

e to

XV

lO-4

(S2

)

-$-

XV

1O

R62

Jl6

TB

5

XV

7

XV

9

TB

18

XV

3

TB

8

C38

XV

ll

-$-

Fig.

7

1.

Fig. 7. F

rom

the

pow

er tr

ansf

orm

er, Tl, connect the red-yellow and

whi

te I

"ads

to g

roun

d lu

g "A

" (C

) at

the

pow

er tr

ansf

orm

er.

2.

(IJ)

Fig. 7. From the power transformer, Tl, twist the two red leads and

run

alon

g th

e ch

assi

s as

sho

wn.

Con

nect

one

red

lead

to X

V12

- 7 (

C)

and

the

other red

lead

to X

Vll-

7 (C

).

3. (

' -(F

ig. 7

. Con

nect

01"

pie

ceof

bare

wir

efro

mX

Vl1

- 1 (

Sl)t

oXV

11- 7

(S2)

.

4. (

" ) F

ig. 7

. Con

nect

a 1

"pi

ece

of b

are

wir

e fr

omX

Vl2

- 1 (

Sl)t

oXV

12- 7

(S2)

5.

(,i

F,g. 7. Run the tw

iste

d pa

ir o

f gr

ey a

nd b

lack

lead

s fr

om h

ole

"al

ong

the

chas

sis

as s

how

n. C

onne

ct th

e gr

ey le

ad to

XFl

- l (C) and the black

lead to J16-:-

1 (C

).

6 (

Fig. 7. C

ut b

oth

lead

s on

a .

03m

fd m

olde

d ca

paci

tor , C40, to

and coverE!och with a

3/4"

pi

ece

of s

pagh

etti.

Con

nect

one

lead

to X

F1-

1 (S

2)and the other lead to ground lug "A" (S3). Be careful not to burn the leads

runn

ing

near

gro

und

lug

"

7. (

Fig.

7. .

From the power transformer Tl, connect th

e bl

ack

lead

(ne

ar-

est g

roun

d lu

g "

) to

J16

- 2 (

C).

V)

Con

nett

rem

aini

ng b

lack

lead

on

pow

er transformer, Tl, to

XF1

-(S

1)

.

9. (

,/) Fig. 7. C

onne

ct th

e 35

0Q, 1

0 w

att r

esis

tor , R63, from TB6-

1 (C

)to TB6-2

(C).

Cut

bot

h le

ads

to ,

1 1/

4" a

nd c

over

'eac

h w

ith a

1'1

pie

ce

spag

hetti

.10. (V) Fig. 7. Cut both leads on the 30

mfd

ele

ctro

lytic

cap

acito

r, C

38, t

o1

1/2"

. Cov

er th

e po

sitI

ve (

+)

lead

with

1 1

/4"

plec

e of

spa

ghet

ti an

d co

nnec

tto

TB

6-2 (C). Connect the negative lead to ground lug

" B

" (S

1)

on X

V12

.

11. (d Fig. 7. C

onne

ct a

1/2

" pi

ece

of b

are

wire

from

XV

12- 3 (C) to

XV

12-4

(C

).

12. (,0 Fig. 7. C

onne

ct a

3"

piec

e of

red

wire

from

XV

12- 4

(S

3) to

TB

6-1

(C).

13. (

'\./Fig. 7. Cut the po

sitiv

e (+

) le

ad o

n th

e 30

mfd

ele

ctro

lytic

cap

acito

rC

39, t

o 1 1/2"

. Cov

er w

ith a

1 1

/4"

piec

e of

spa

ghet

ti an

d co

nnec

tto X

V12

-3 (S2). The other lead w

ill b

e co

nnec

ted

late

r.

14. (\hi

9' 7

. Con

nect

a 6

" pi

ece

of o

rang

e w

ire fr

om T

B6-

2 (S

3) to

XV

7-9(

C).

15. (

trFi

g. 7

. Con

nect

a 3

/4"

piec

e of

bar

e w

ire fr

om T

B6-

1 (C

) to

XV

11- 3

(S

1).

16. (

w)

Fig.

7. C

onne

ct a

7"

piec

e of

ora

nge

wir

e fr

om X

V7-

9 (S

2) to

XV

9-9

(C).

17. (

\, YFig. 7. Connect a 6" pi

ece

of o

rang

e w

ire

from

XV

a-9

(Sl)

to T

B5-

1 (C

).

18. (

\.J F

ig. 7

. Con

nect

a 3

" pi

ece

of o

rang

e w

ire f

rom

XV

I0- 9

(C)

to X

V9-

9(S2

).

19. (

yYFi

g. 7

. Con

nect

a 1

" pi

eceo

f ba

re w

ire

from

TB

5-1

(C)

to X

VlO

- 9 (S2).

20. (

1/1 Fig. 7. ConneCt a 4 1/2" piece of orange wire from TB5-2 (C) to

TB 18-2

(C).

21. (

~i9

7. Cut both le

ads

on a

4. 7

KQ

(ye

llow

, vio

let ,

red

, silv

er)

2 w

att

resi

stor, R62, to

3/4"

Connect from TB5-

1 (S

3) to

TB

5-2 (S2).

22. ~

/) Fi

g. 7.

XV

7-3

(C).

23. (

\)lF

ig.

to X

V9

3 (C

).

Con

nect

a 3

1/2

" pi

ece

of y

ello

w w

ire f

rom

XV

8-3

(C)

to

Con

nect

a 3

1/2

" pi

ece

of y

ello

w w

ire

from

XV

10- 3

(C)

24. r) Fi

g. 7

. Con

nect

an

81/2

" pi

ece

of r

ed w

ire fr

om T

B5-

3 (C

) to

TB

6-1

(S4)

.

25. (

.... )'

Fig

. 7.

Con

nect

the

blac

k w

ire fr

om h

ole

" U" to TB7-

1 (C

).

26. (

;) ,Fig. 7. Connect th

e gr

een

wire

from

hol

e li T

" to XV3-2 (S 1)

.

27. (

vi/F

ig. 7

. Connect the ye

llow

wire

from

hol

e " U

" to TB8-

1 (C

).

28.

(V)

Fig

. 7. C

onne

ct a

3 1

/2"

piec

e of

bla

ck w

ire fr

om T

B7-

1 (C

) to

TB

8-2

(C).

29. (\J Fig. 7. Connect the ou

ter

shie

ld f

rom

the

sing

le c

ondu

ctor

shi

elde

dca

ble

(fro

m h

ole

")

to T

B7-

1 (C

) an

d th

e in

ner

cond

ucto

r of

the

som

e ca

ble

to T

B7-

2 JC

).

30.

('0.1

Fig. 7. S

trip

bac

k th

e ou

ter

insu

latio

n 3/

4" fr

om o

ne e

nd o

f a 8

"piece of single conductor shielded cable. T

wis

t the

shi

eld

stra

nds

toge

ther

.St

rip

the

insu

latio

n on

the

inne

r co

nduc

tor

back

1/4

" . Connect the shield to

TB

7-1

(C)

and

the

inne

r co

nduC

tor

to T

B7-

2 (C). On the other end of the same

cabl

e, s

trip

the

oute

r in

sula

tion

back

1/2

" . Twist the shield strands together.

Stri

p th

e in

sula

tion

on th

e in

ner

cond

ucto

r ba

ck 1

/4"

Con

nect

the

shie

ld to

J14, 15-

1 (S

l) an

d th

e in

ner

cond

ucto

r to

J14

, 15-

2 (S

l).

-$-

J 14

1 5

TB

1

TB

2

XV

10

C29 R57

C30

XV

7

R56

XV

9

TB

19

TB

18

C37

XV

4T

B21

B15

TB

8

R25

-$-

Fig. 8

1.

(d)

Fig.

8. C

ut th

e ne

gativ

e (-

) le

ad o

n th

e 30

mfd

ele

ctro

lytic

cap

acito

r,C39, tol 1/4". Connect to TBI0-

1 (C

).

2. ,,) Fig. 8. From the output transformer, T2, connect the yellow lead to

TB

l-4 (C), the green lead to TB1-3

(S1)

, the

bro

wn

lead

to T

Bl-2 (Sl), the

black lead to TB 1-1

(C),

the

red

lead

to T

B5-

3 (C

), th

e bl

ue le

ad to

XV

7-7

(S H

,the bro

ym- y

ello

w le

ad to

XV

8-7

(Sl)

, and

the

oran

ge le

ad to

TB

l-5

(Sl)

.

3. (V) Fig. 8. Connect a 3 1/2" piece of gr

een

wire

from

XV

7-6

(C)

toX

V8-

6 (C

).

piece of single conductor shielded ca

ble~

Tw

ist t

he shield strands together.

Stri

p th

e in

sula

tion

on th

e in

ner

cond

ucto

r ba

ck 1

/4". Connect the shield to

TB

21- 1

(C

) an

d th

e in

ner

cond

ucto

r to

TB21-2 (C). On the ot

her

end

of th

esa

me

cabl

e, s

trip

the

oute

r in

sula

tion

back

1/2

" . Twist the shield strands to-

geth

er. S

trip

the

insu

latio

n on

the

inne

r conductor back 1/4". Connect the

shie

ld to

J14

, 15-

4 (5

1) a

nd th

e in

ner

cond

ucto

r to

J14

, 15-

3 (S

l).

4.

U)

Fig. 8. Connect a 3 1/2" piece of gr

een

wire

from

XV

I 0- 8

(C) to

T8

19-1

(C

).

5. .

Fig. 8. Cut al

l lea

ds o

n tw

o 50

mfd, 25V, electrolytic capacitors,

C29

, and

C30

, to

1". Cover the po

sitiv

e (+

) le

ads

on b

oth

capa

cito

rs w

ith a

3/4"

pi

ece

of s

pagh

etti.

Con

nect

the

posi

tive

lead

of o

ne c

apac

itor

toX

V10

-(S2) and the negative (-) lead to ground lug "C

" (S

l) a

t XV

9. C

onne

ct th

epo

sitiv

e (+

) le

ad o

f the

sec

ond

capa

cito

r to

XV

8-3

(52)

and

the

nega

tive

(-)

lead

to g

roun

d lu

g " D

" (S

l) at

XV

7.

;::; 6

. (\.

Fig. 8. C

ut b

oth

leads on a

1650

, 5

wat

t res

isto

r )' R

56, t

o 3/

4"C

over

one

lead

with

a 1

/2"

piec

e of

spa

ghet

ti an

d co

nnec

t XV

9-3

(S2)

. Con

-ne

ct th

e ot

her

lead

to g

roun

d lu

g " E

" (S

l) a

t XV

I0. D

ress

res

isto

r aw

ay f

rom

surr

ound

ing

wir

es.

7.

Fig. 8. From the output tr

ansf

orm

er, T

3, c

onne

ct th

e ye

llow

lead

toT

B2-

4 (C

)r

the green lead to TB2-3

(S 1

), th

e br

own

lead

to T

B2-

2 (S 1), the

blac

k le

ad to

TB

2-1 (C), the red lead to TB5-3

(S3)

, the

blu

e le

ad to

XV

9-(S

l), t~

e br

own-

yello

w le

ad to

XV

10- 7(Sl)and the orange lead to TB2-5 (S1).

I /8.

(~

f Fi

g.S. Connect the br

own

lead

from

hol

e " T

" to

TB

11- 2

(C

).

9. (

J) F

i ./;. Connect" 2 1/2" piece "Iced wi'e from TB9-3

(C)

to T

B 1

1-1

(C).

10.

(\1

Fig. 8. C

onne

ct th

e ou

ter

shie

ld fr

om th

e si

ngle

con

duct

or c

able

(fro

m h

ole

li)

to T

B21

- 1(C) and the inner conductor to TB21-2 (C).

13. (

le) Fig. 8. Cut one lead on

the

1650

, 5

wat

t res

isto

r, R

57, t

o 1

1/2"

and cover with a 1 1/4" piece of spaghetti. C

onne

ct th

is le

ad to

XV

7-3 (S2).

Cut

the

ot~e

r le

ad to

1/2

" an

d co

nnec

t to ground lug R

(Sl)

. Dre

ss a

way

from

the surrou,nding wires.

14.

("~t

Fig. 8. Connect a 3 1/2" piece of black wire from TB8-2 (C) to

TB

21-1

(C).

15. (

, /)

Fig.

8. C

onne

ct a

3"

iece

ofbl

ackw

iref

rom

TB

21- 1

(C

)toT

Bl1

- 3(C

).

16.

Fig. 8. Connect a 3 1/2" piece of black wire from TBll-

3 (C

) to

grou

nd lu

g n

G"

(C).

17. (

\i)/F

ig. 8

. Con

nect

the

grey

lead

from

hol

e " T

" to

XV

4-2

(Sl).

18.

F)g.

8. C

onne

cta

4"pi

ece

of o

rang

e w

irefr

omT

B10

- 2(C

)toT

B9-

2(C

).

/ /

19. ~

~fg. 8. Connect" 3 1/2" p;aca "hod whoa

froM

181

1-1

(C)lo

TB

I8-3

(C

).

20. (

'vi F

ig. 8

. Con

nect

a 4 1/211 pi

ece

of r

ed w

ire fr

om T

B18

- 3(C

) to

C37

-B (

C).

21. (

) F

ig. 8

. Con

nect

a 3

" pi

ece

of r

ed w

ire fr

omT

B18

- 3 (

C)

to T

B15

- 1 (

C).

22. (

"'r Fig. 8. Connect a 3 1/2" piece of orange wire from TB18-2 (C) to

C37

-A (

0).

23.

Fig. 8. Connect a 1" piece of bare wire to the dual concentric pots

in th

e re

ctan

gula

r ho

le a

t the

mid

dle-

fron

t of

the

chas

sis.

Con

nect

from

R24

-(Sl) to R25::-3

(C).

12. (~ Fig. 8. S

trip

bac

k th

e ou

ter

insu

latio

n 3/

4" fr

om o

ne e

nd o

f an

8"

24. (

\J f

ig. 8

. Con

nect

a 2

" pi

ece

of b

lack

wire

from

R25

- 3(S

2) to

TB

11- 3

(C

).\l/

25. (

\J)

Fig

. 8. C

onnect a 1 3/4" piece of green wire from R25-2

(51)

toX

V3-

7 (S

1).

11.

(J)

Fig. 8. Connect a 3 1/2" piece of orange wire from TB9-2 (C)

TB

18-2

(C

).

R59

(31

R55

R48

R53 R51

R49

(25

(33

(35

R45

C27

R47

R43

C23 R41

R39 (21

C17

TB

4 TBl TB20

TB

3 T

B2

~\ (

(I)

~I -,

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j.. ,)

~

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~ ~

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!10

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~~~

, 4-

\.

'Ut

'" ~

:~..:~

~

"-\'J--. r

",.

:k~ I

~ o-

ff:~'

""=

,~~

. ~"1

- ,

!:51$

I

, -

"'~ ~ ~"

,'~

€)

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,,1-

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. ~U

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~,L

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,- W

l'-' ~

R

. ~~

. c-"

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~~,; ~~C

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""""

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~ ~

-~:,r

?;

i~ts

:~i1

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H~

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f 0 '" '

-'tot., ",:""",

0 ~

---

0 ~o

~ ~-

' "

,,,' ~

~~

"~

,",

' ~~

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/j,

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AJ/

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J/fi

J

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f\!H

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~~

----

.U

w b

----

(L ~

~'

(( '"

Y ~

\'\.\..

'

~I

g=

Fig.

9

-$-

R58 (32

R54

R52

R50

C34

R46

C28 (36

R40

C26 (24

E38 r44

R42 (22

(18

R24

1. (

\)Fi

g.9.

Con

nect

a21/

2"pi

eceo

fgre

enw

iref

rom

R24

- 5(S

l)to

XV

4-7(

Sl).

2. (

1) /Fig. 9. C

onne

ct a

9"

piec

e of

bla

ck w

ire fr

om X

V5-

8 (C

) to

T84

(C

).

3. ( ) Fig. 9.

Con

nect

a 9

" pi

ece

of b

lack

wire

from

XV

6-8

(C)

to T

B3-

1 (C).

4.

(viF

ig. 9. Cut all leads on two 47mmf, 10% di

sc c

apac

itors

, C31

and

C32

, to

3/4"

. Connect C32 from TB2-4

(C)

to T

B3-

1 (C

) an

d th

e ot

her

capa

ci-

tot, C31,

from 1Bl-4 (C) to 184 (C). Each lead is to be covered with a 1/

2"pi

ece

of s

pagh

etti.

5. h

)Fig

. 9. C

onne

ct a

1"

piec

e of

bar

e w

ire

from

TB

l-l (

S2)

to T

B3-

2 (S1).

6. (

) /

Fig

. 9. C

onnect a I" piece of bare wire frQm TB2-

1 (S

2) to

gro

und

lug

IIH;' (Sl).

7. (

\/,

Fi.g

. 9. C

ut a

ll le

ads

on th

e tw

o 22

KO

(re

d, r

ed, o

rang

e, g

old)

5%

resi

stor

s, R

58 a

nd R

59, t

o 3/

4". Connect R58 fr

om T

B2-

4 (S

3) to

TB

3-1 (S3)

and

R59

from

1B

1- 4

(S3

) to

184

(S3

). E

ach

lead

is to

be

cove

red

with

a 1

/2"

piec

e qf

spa

ghet

ti.8.

(\;1

Fig

. 9. C

ut all le

ads.

on

the

six

10K

Q (

brow

n, b

lack

, ora

nge,

silv

er)

... res istors, R40, R41,R52; R53, R54, and R55, to 1/2". Connect R55 from X

V8-

6-0 (S.2)

to X

V8-

2(Sl). Conne~t R53 re

sist

or f

rom

XV

7-8(

C)t

oXV

7-2

(Sl)

. Con

-ne

ct R

54 fr

om X

V10

- 8 (S2) to XV1Q;..2 (S 1) C

onne

ct R

52 fr

om X

V9-

8 (C

) to

XV

9-2 (S 1). Connect R41 from TB9-

1 (C

) to

1B

9-2 (C). Connect R40 from

TB

18- 1

(C

) to

TB

18- 2

(C

).

9. ~./) ~ig. 9..

Con

nect

a 3

" pi

ece

of g

rey

wire

from

TB

20- 2

(C

) to

XV

9-8 (S2).

10; (

fI) F

ig. 9

. Cut

all

lead

s on

the

two

330K

O (

oran

ge, o

rang

e, y

ello

w, s

ilver

)re

sist

ors,

R48

and

R50 to 1/2". Connect R50 from TB 19-2 (C) to TB 19-

1 (C

).Connect R~8 from TB20-

1 (C

) to

TB

20- 2

(C

).

11. (t)lFig. 9. Cutall leads on the two 330KO(orange,

oran

ge, y

ello

w; s

ilver

)re

sist

ors,

R49

and

R51 to 3/4". Connect R49 from TB 10-

1 (C

) to

XV

7-8

(C).

Con

nect

R51

from

XV

7-6

(C)

to g

roun

d lu

g"

I" (

C).

12. (

\;Fig. 9. C

ut a

ll le

ads

on th

e fo

ur. 0

25m

fd (

25K

or

25, O

OO

mm

f) d

isc

capa

cito

rs, C

33, C

34, C

35, a

nd C

36, t

o 3/

4". Connect C33

from

XV

5-1

(C)

to X

V7-8 (S3). Connect C35 from XV5-3

(C)

to X

V7-6 (S3). Connect C

34fr

om X

Y6-

1 (C

) to

TB

20- 2 (S3). Connect C

36 f

rom

XV

6-3(

C)

to T

B19

-1 (

S3).

13.

Fig 9. Cut al

l lea

ds o

n th

e tw

o 10

0KO

(br

own,

bla

ck, y

ello

w)'

gold

)

5% r

esis

tors

, R45 and R46, to 1/2". Connect

R45

fro

m X

V5-

1 (C

) to

TB

I0-

(S2)

. Con

nect

R46

from

XV

6-3

(C)

toT

B19

- 2 (

C).

14. (

Fig

. 9. C

ut a

ll le

ads

on th

e tw

o 10

0KO

(br

own,

bla

ck, y

ello

w, g

old)

5% r

esis

tors

, R44 and R47" to 3/4". Connect R47 from XV5-

3 (C

) to

gro

und

lug

" 1" (C). C

onne

ct R

44 fr

om X

V6-

1(C) to TB9-2

(C).

15.

,or)

Fig. 9. Cut all leads on th

e tw

o 22

5mm

f di

sc c

apac

itors

, C25

and

C28

to 3

/4" .

Connect C25 fr

om X

V5-

1 (S

3) to

TB

I0- l

(S3

). C

onne

ct C

28fr

om X

V6-

3 (S3) to TB 19-2 (S3).

16. (

\#) Fig. 9. Cut all leads on the tw

o 22

5mm

f dis

c ca

paci

tors

, C26

and

C27

, to 1". Connect C

27 f

rom

XV

5-3

(S3)

to g

roun

d lu

g"

I" (

53).

Con

nect

C26

fro

m X

V6-

1 (53) to TB20- 1 (S2).

17. (

\')'j:

ig.

9. C

ut a

ll le

ads

on tw

o 1.

8K

O (

brow

n, g

rey,

red

, gol

d) 5

% r

esis

-to

rs, R

42 a

nd R

43, t

o 3/

4". C

onne

ct R

43 fr

omX

V5-

8(S

2) to

TB

7-1

(S5)

.C

on-

nect

R42

ifrom

XV

6-8

(S2)

to T

B21

- 1 (C).

18.

~j

Fig.

9. C

ut a

ll 'le

ads

on tw

o 47

0KO

(ye

llow

, vio

let,

yello

w, s

ilver

)re

sist

ors,

R38

and

R39

, to

3/4"

. Connect R39 from X

V5-

6(C

) to

TB

9-2 (S5).

Con

nect

R38

from

XV

6-6

(C)

to T

B18

- 2 (S5).

19. (

,,~ Fig. 9. Cut all leads on tw

o 15

0mm

f dis

c ca

paci

tors

, C23

and

C24

, .to 1". Connect C23 from XV5-

6 (C

) to

TB

9-1

(S2)

. Con

nect

C24

from

XV

6-(C) to TB 18-1 (S2).

20. ('

)'Fig

.9.

Con

nect

al1/

4"pi

eceo

fbar

ewir

efro

mT

B7-

2(C

)toS

5-1(

S1).

21. (\) Fig. 9.

Con

nect

a 3

/4"

piec

e of

bar

e w

ire f

rom

TB

21- 2

(C

) to

XV

6-7(

Sl).

22. (

,. 1 F

ig. 9

. Con

nect

a p

I pi

eceo

fbar

ewir

efro

mX

V5-

2 (S

l) to

XV

5-6 (S3).

23. ,("J Fig. 9. Cut a 1/

1 pi

ece

of b

are

wire

from

XV

6-2(

S1)

to X

V6-

6 (S3).

24. (\/~

i9' 9. Cut all leads on four. 1 mfd (brown, bl

ack,

yel

low

, yel

low

)m

olde

d ca

paci

tors

, C17

C18

, C21

and

C22

, to

3/4"

. Cover each lead with a

1/2" piece of spaghetti. Connect C

17 fr

om X

V3-

9 (C

) to

TB

8-1

(S2)

. Con

-ne

ctC

18 fr

om X

V4-

6(C) to TBl1-2(S2). Connect C21 fr

om X

V3-

1 (C

)to

TB

7-2

(S4)

. Con

nect

C22

from

XV

4-1

(C)

to T

B21

- 2 (C). Dress the leads as

show

n an

d pu

sh a

ll ca

paci

tors

flat against the chassis.

J~,1

0 R

~9 J

13 R

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f:jJ

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~~ /'

~ .

~"

J/ia

T

B17

il;L

, ~

, \"

~'

-r;~

:'

: ,

it\~ "

. '6J

/ V

TB

9....

.......

1I1

1~ M

,'.,~

s:!

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€) ~

. O

Ft.

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. -

C47

.....

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l"':'~"

\, '"

~

r.o'

~ I

~ I

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;;;\'1

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t. .

III ...

I'(2

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.....

R12

JjA

~ ~

I' ~

-- ~

':1:-

, = ~

..

~ -

t ,

TB

2

~(

~~

=-

1$

v:F

L" r

R37

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'I"

~/ ~

rv'

), ~

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~)

I'

~~\

~ ~~

~r,~

~~ ,. """

......

.

~~ ~ J~

.j ~

~~J

~ ~"

f.'

- !

~~-

R35

- i&L

"~-:

:'~ ~.

~ .

, "

\t

t~~

r::::

:=--

~ ~-

~i:

.... T

B14

XV4 gL~

.....

~

. 1,(9)

~~ ~ ~

;J~ ~

~~jtP

s.~

C48

~,

' ~ 1ICJ'

11 (~

\0\-

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~ ~ c

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R

34

"'"

~~

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~ - '.1

: I""

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r ~

J ' \ ~Ar3

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-,

' .

8 ~

fro)

j

"""

~~...

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J,-

;';'f'

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!

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~~

rl

~o

R27

~. ~ C--!

,'

~"U

" ~ I ,

' \l..

....~/

~

L/

~~-;

v- V,

. '

jjI'( I

/./-"

I7/(

tJ'g

-r

, ,c (01. ~

1)(\

r:J

. . ~

')!~I

~ ~

"",

,,' ~

......

~ ' y

0 --

- ~

-.a.

,., ,

i. L I

.(.J

.J

'0 fi

0 t01

R29 R

IJ:~

($

i:'~

..;r'

~'

\ 1'-'

.t1

fjtj.

' 15.

0)

. "

. ~ .

.I

,~rh. :A(.

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(~

~ ~

. 'n

R36

~ . ~

-J"

llil

'P I

~~ -

~ .

......

~ If

(~,z

~t~

JI ~

k.... -

~/\

S5

!en~

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'J 7~l(

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(

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1no1

T

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~oilM

Jol r-

--T B 8

A ,1

;j,) 4~

""'-

........" o'--

' .

- .

., ---

I~ OJ

TfOUI.." I

\IT

B

1 5

C 1

6

~ ~

~ --

--=

::::::

:::: '

""

/JJ ft ~

~ 11

~iD

.

~1f

\~ \'

R

28-

~:D

~~

-I. I

I R

26(f

J\I

T

B 1

2

Fig.

$-.

! /

Ii'

1.

Fig. 10. Cut all le

ads

on tw

o 10

0KQ

(bro

wn,

blac

k,ye

llow

, silv

er)

')re

sist

ors,

R34

and

R35

, to

1/2"

. Con

nect

R34

from

XV

4-1 (S2) to TB 18-3 (S4)!

Con

nect

R35

from

XV

3-1

(S2)

to T

B9-

3 (S2).

---"

"""

""""

" "'

--"

""'.

."""

,.'

"2~

('v

) F

ig. 1

0. C

ut a

ll le

ads

\)n

two

150K

Q (

brow

n)' g

reen

)' ye

llow

, silv

er)

resistors, R26 and

R27

, to 1/2"

. Con

nect

R26

from

XV

4-6

(S2)

to T

B15

-1 (

52).

Con

nect

R27

from

XV

3-6

(S2)

to T

B11

- 1 (

S3).

3. (\

/) F

ig. 1

0. C

ut a

ll le

ads

on tw

o 1.

8K

Q (

brow

n, g

rey,

red

, silv

er)

10%

resi

stor

s, R

28 a

nd R29, to 1/2". Connect R28 fr

om X

V4-

8 (C

) to

181

1-3

(C).

Con

nect

R29

from

XV

3-8

(C)

toT

B8-

2 (C

).

4.

(J)

Fig. 10. Cutall leads on two. 02

mfd

(20

K o

r 20

, OO

Om

mf)

dis

c ca

paci

-to

rs, C

IS a

nd C

16, to 1/2". Connect C 15, f

rom

XV

3-8

(S2)

to T

88-2 (S4).

Con

nect

C16

fro

m X

V4-

8 (S

2) to

TB

ll-3 (S5).

5. (\~Fi,9. 10. Cut all leads on two 3. 3K

Q (

oran

ge, o

rang

e, r

ed, s

ilver

) re

sis-

tors, R3(/ an

d R

37, t

o 5/

8". Connect

R36

fro

m X

V4-

3 (C

) to

gro

und

lug

"(C). 96nnect R37 from XV3-3

(C)

to T

B21

- 1 (

C).

6. (/) Fig. 10. Cut all leads on two. 01 mfd O

OK

or

10, O

OO

mm

f) d

isc

capa

ci-

tors

, C47

and

C48

, to

3/4"

. Connect C47

from

XV

3-3

(S2)

to T

B21

- 1 (

C).

Con

nect

C48

fro

m X

V4-

3 (S

2) to

gro

und

lug

" G"

(C),

7.

('\l

Fig

. 10.

Con

nect

a4'

! pie

ce o

f or

ange

wire

from

C37

-C (

C)

to T

B15

- 2(C

).

8. (

,) Fi

g. 10. Connect a 3 1/2" piece of black wire from ground lug "

(C)

to"'~1

2-2

(C).

9. (V)

Fig.

10.

Con

nect

a 4

" pi

eceo

(ora

nge

wir

e from TB17 (C) to C

37-C

(C

).

10.

j,

Fig

. 10.

Con

nect

a 4

1/2

" pi

ece

of b

lack

wire

fro

m g

roun

d lu

g "

G"

(C)

to T

B14

-(C

).

11. (

\)/P

/ig.

lO. C

onne

ct a

4"

piec

e of

ora

nge

wire

from

Ta1

7 (C

) to

TB

13- 2

(C

).

12. (

'I~ Fig. 10. Connect a 3 1/2" pi

ece

of b

lack

wire

from

TB

l4-2

(C

) to

TB 13-

1 (C

).

13. (

\);F

ig. 1

0. Connect the bl

ack

lead

fro

m S

lA- l

O to

TB

12-2

(C

).

14. (

I) Fi

g. 10. Connect the brown le

ad fr

om S

lD-7

to T

B12

- 1 (

C).

15.

qn

Fig.

10.

Con

nect

the

shie

ld f

rom

the

sing

le c

ondu

ctor

shi

elde

d ca

ble

from SlB-5) to TB12-2 (C). Connect the inner conductor to TB12-3(

C).

16. (

.) Fig. 10. Connect the gr

ey le

ad fr

om S

IB- I

I to T

B12

-4 (

C)

17. (,) ~ig. 10. Connect the greylead from SlG-12 to TB14-4

(C).

18. (

" ")

Fig.

10.

Con

nect

the

shie

ld f

rom

the

sing

le c

ondu

ctor

shi

elde

d ca

ble

(fro

m S

1 G

-6) to 1814-2 (C). Connect the inner conductor to TB 14-3

(C).

19. (

\/) Fi

g. lO.

Connect the black lead from 51H-ll to TB14-2

(C).

20. (

\,) F

ig. 1

0. C

onne

ct a

1 1

/2"

piec

e of

bar

e w

ire

cove

red

with

a 1

1/4

"pi

ece

of s

pagh

etti

from

J8,

9, 1

0-2

(C)

to J

8,9, 10-5 (C).

21. (

). /

Fig.

10.

Con

nect

a 1

1/2

" pi

ece

of b

are

wir

e covered with a 1 1/4"

piec

e of

spa

ghet

ti fr

om J

l1)'

12, 1

3-2 (C) to Jll, 12, 13-5

(C).

22. (

,Fig. 10. Cut all le

ads

on tw

o 10

0KQ

(br

own)

' bla

ck, ye

llow

, silv

er)

resi

stor

s, R

68 a

nd R69, to 1/2". Connect R68 from J11, 12, 13-2 (S2) to Jll,

12, 1

3-; (

C).

Con

nect

R69

from

J8,

9, 1

0-2

(S2)

to J

8, 9

, 10-

3 (C

).

~3. (

,I) Fig. 10. Run th

e th

ree

cond

ucto

r sh

ield

ed c

able

from

sw

itch

waf

erS

~B

alon

g th

e ch

assi

s as

sho

wn.

Con

nect

the

shie

ld to

J8,

9, 1

O- 5

(S2)

; con

nect

the

brow

n le

ad to

J8,

9, 1

0-1

(Sl)

, con

nect

the

red

lead

to J

8,9,

10-

3 (S2);

""an

~ c

onne

ct th

e or

ange

lead

to J

8, 9

, 10-

4 (S

1).

24. (\) Fig. 10. Run the three conductor shielded cable from switch wafer

SlH

alo

ng th

e ch

assi

s as

sho

wn.

Con

nect

the

shie

ld toJl1, 121

13-5

(S

2); c

on-

nect

the

brow

n le

ad to

J11,

12,

13-

1 (5

1); c

onne

ct th

e re

d le

ad to

J11

, 12)

' 13-

(S2)

; apd

con

nect

the

oran

ge le

ad to

Jll, 12, 13-4

(St)

.

25.

I)

Fig

. 10.

Con

nect

a 2

" pi

ece

of g

rey

wire

from

TB

12- 4

(C)

to X

Vl-

2 (C

).

26. k) F

ig. 1

0. C

onne

ct a

3"

piec

e of

gre

y w

ire f

rom

TB

14-4

(C)

to X

V2-

2 (C

).

27. (') Fig. 10. Cut all le

ads

on fo

ur 2

00K

Q (

red,

bla

ck, y

ello

w, g

old)

5%

resi

stor

s, R

5, R

6, R

11 a

nd R

12t0

5/8"

. Con

nect

R5

from

C37

- C (C)

tp

XV

l-6(

C).

Connect R6 from TB13-2

(52)

to X

V2-6(C). Connect

R11

fro

m T

B15

- 2 (S2) to

XV

l-1 (G). Connect R12 f~

om T

B17

(S

3) to

XV

2-1

(C).

tI.)

tI.)

Fig. 11

TB

21R

13T

B12

R66

R19

R65

1. (V!

Fi9.

110

Cut

all

lead

s on

two

25m

fd e

lect

roly

tic c

apac

itors, C5 and

, to

1" a

nd c

over

eac

h w

ith a

3/4

" pi

ece

of s

pagh

etti.

Con

nect

the

posi

tive

(+)

end

of C

5 to

XV

I-8

(C)

and

the

nega

tive

(-)

end

to 1

B12

-2 (C). Connect

the pos;,l

ve (

+)

end

of C

6toX

V2-

8 (C

) an

d th

e ne

gativ

e (-

) en

d to

TB

14-2

(C)0

2.

1' Fig. 11. Cut all leads on two 2.

2KQ

(re

d, r

ed, r

ed, s

ilver

) re

sist

ors,

R7

and R8, t

o 3/

4" a

nd c

over

eac

h le

ad w

ith a

1/2

" pi

ece

of s

pa~

hetti

. Con

nect

R7

from

XV

l-8

(S2)

to 1

B12

-2 (

C).

Con

nect

R8

from

XV

2-8

(S2)

to 1

B14

-2 (

C).

10. (

,A'Fig. 11. Cut all leads on two IM

Q (

brow

n, b

lack

, gre

ensi

Ive

r) r

esis

-to

rs, R9 and RIO, to 3/4". Cover bo

th le

ads

with

a 1

/2"

piec

e of

spa

ghet

ti.C

onne

ct R

9 fr

om X

VI-

2 (S

2) to

gro

und

lug

" G

" (C

).. C

onne

ct R

IO f

rom

XV

2-(S

2) to

1B

J3-1

(S4).

3. (\) Fig. 11. Cut the ground end (i

f th

e ca

paci

tor

is s

o m

arke

d w

ith a

line

)of two. 25 mfd paper capacitors

, C 1

and

C2, to 1"

(If

it is

not

mar

ked, cut

eith

er e

nd to

1"

0 ) C

onne

ct th

is e

nd o

f C 1

to X

Vl-

6 (S

2) a

nd th

is e

nd o

f C2

toX

V2-

6 (S2). Cut the other end of both capacitors to 3/4". Connect th

is e

ndof Cl to 1B12-4 (S3) and th

is e

nd o

f C2

to 1

B14

-4 (

S3)

.

11. ~

YFi

g. 1

1. C

ut b

oth

lead

so(l

a22K

Q (

red

, red

, ora

nge

, silv

er)

1 w

att r

esis

-to

r , R61 to 3/4"

. Con

nect

from

f:.3

7-A

(S2

) to

C37

-B (

C).

/ '

12. (\yFig. 11. Cut both leads on a

68K

Q (

blue

, gre

y, o

rang

e, s

ilver

) re

sist

orR

60, to 1/2". Connect from C37B (S

3) to

C37

C (S

4)0

4.

U)

Fig

. 11.

On

two

lOK

Q (

brow

n, b

lack

, ora

nge,

silv

er)

resi

stor

s, R

3 an

d, cut one lead to 1/2" and the other lead to 3/4". Connect the 1/2" le

adof

R3

to X

Vl-

7 (S

1) a

nd th

e 3/

4" le

ad to

TB

12- 3

(C

). C

onne

ct th

e 1/

2" le

adof

R4

to X

V2-

7 (Sl) and the 3/4" lead to TB14-3

(C).

13. (

) F

ig. 1

1. C

ut a

ll I e

ads

on tw

o 68

KQ

(bl

ue, g

rey,

ora

nge

si I

ver)

res

isto

r,R 19 and R20 to 1/2". Connect R 19 from S3-2

(C)

to S

3-3 (C). Connect R20

from

S3

-)C

)

to S

3-6

(C).

14. (.!Fig. 1. Cut all leads on two 33

0KQ

(or

ange

, ora

nge

, yel

low

, silv

er)

resi

stor

sR65 and R66 to 1/2"

. Con

nect

R65

from

S3-

2 (S

2) to

S3-

1 (C

). C

onnect R66 ;10m S3-5

(S2)

to S

3-4

(C).

150 (~

i9'

11. From hole

" S

" co

nnec

t the

whi

te le

ad to

S3-

6 (S2), th~ brown

lead to S3-4 (S2), the blue lead to S3-3

(S2)

and

the

gree

n l,e

ad to

S3-

1 (S2).

5. (

.)Fig. 11. Cut both le

€lds

on

two

IMQ

(br

own

blac

kgr

een

silver) resis

~ to

rs, Rl and R2, to 1/2". Connect Rl fr

om 1

B12

-3 (

S3)

to 1

B12

-2 (

C),,

Con-

nect R2 from 1B14-3

(S3)

to 1

B14

-2 (

C).

6.

(v)

Fig

. 11.

Cut

aille

adso

n tw

o.00

12m

fd (

1.2K

orI2

00m

mf)

disc

cap

aci-

tors

, C41

and

C42

to 1

/2".

Connect C41 from 1B 12-1 (C) to TB 12-2 (S7).

Con

nect

C42

from

TB

14-1

(C

) to

1B

14-2 (S8).

16.

(\,,1

Fig. 1. Push the lin

e co

rd th

roug

h th

e gr

omm

et a

t the

rea

r of the

chas

sis,

near the fuseholder. 1ie a knot inside the chassis, 3" from the solder

lugs. Con~e

ct o

ne le

ad to

J16

-1

(S2)

and

the

othe

r le

ad to

J16

-2 (S2)0

17. (

~i9.

ll. Connect the

' bro

wn

lead

from

Sl F

- S to 1"B14-1 (S3).

/'

18. (

\jig

.

11. C

onne

ct th

e bl

ack

lead

from

SI

F-6

to g

roun

d lu

g " G

" (S

9).

19. (\rFig.11. Connect a l"

piec

e of

bar

e w

ire

from

S5-2

(Sl)

toX

V5-

7(S1

).

7.

Fig.

11.

Cut

all

lead

son

two.

025

mfd

(25

K o

r 25

000 mmf) disc capaci-

tors

C7

and

CS

, to

3/4"

. Con

nect

C7

from

XV

l-l (

S2)

to T

B12

-1 (

S3).

Con

-ne

ct C

~/fr

om X

V2-

1 (S

2) to

1B

14-1

(C

) .

8. y

) Fig. 11. Cut al

l lea

ds o

n tw

o 10

mfd

, 6 volt electrolytic capacitors

C3

and

C4

, to

3/4"

. Cover ~ach lead w

ith a

1/2

" pi

ece

of s

pagh

etti.

Con

-ne

ct th

e po

sitiv

e (+

) en

d of

C3

toX

Vl-

3(C

)and

the

nega

tive

(-)I

eadt

ogro

und

lug

" G

" (C

). C

onne

ct th

e po

sitiv

e (+

) en

d of

C4

to X

V2-

3 (C

) an

d th

e ne

gativ

e)

lea9

' to

1B13

-1

(C).

9.

Fig.

11.

Cut

bot

h le

ads

on o

ne 4

. 7K

Q (

yello

w, v

iole

t, re

d, s

ilver

) re

-si

stor

, R14

to 1

/2"

and

both

lead

sol1

asec

ond4

.;7KQ r~sistor, R13, to

3/4"

Con

nect

R14

, (w

ith th

e sh

orte

r le

ads)

fro

mX

V2-

3(S

2) to

TB

13-1

(C

). C

onne

ctR

13 (

with

the

long

er le

ads)

fro

m X

VI-

3 (S

2) to

gro

und

lug

"G"

(C).

20. ,,) F

j,Q; 1

1. S

trip

bac

k th

e ou

ter

insu

latio

n on

bot

h en

ds o

f a5" piece

of singl~

nduc

tor

cabl

e 1/

2"T

wis

t the

shi

eld

stra

nds.

Str

ip b

ack

the

insu

latio

n on

the

inne

r co

nduc

tor

on b

oth

ends

1/4

". On one end

, cut

the

shi e

ldst

rand

s an

d co

nnec

t the

inne

r co

nduc

tor

to S

5-3 (S 1). O

n th

e ot

her

end

, con

nect

the twisted shield strands to 1B21-1 (SS) and the inner condu,ctor on the same

end

to 1

B21

-(S

5).

21.

r ~

11. M

ount the top shiEddasshownininsert on figure 4.

Use

two #6 IVckwashers and two #6-

32 h

ex n

uts.

...~g

~.

.~...

~oO

~Off

i'o

::.,::

.

#8 Pk.

Tin

nerm

an A

ngle

Bra

cket

Cha

ssis

Bez

elC

ontr

ol P

late

#4-40x1/4 Screws

000

O~~

~\~~

:

Scre

w#8

-32 Tinnerman Nut

Side Bracket

#8-32x3/8 Brown Screw

#6 Pk.

Fig.

12

Brown Screw

FINAL STEPS

of the cabinet from the ou

tsid

e, u

sing

a s

mal

l scr

ewdr

iver

. The

fla

t por

tion

shou

ld b

e th

e ac

tual

res

ting

or c

onta

ct s

urfa

ce.

You

hav

e no

w c

ompl

eted

the assembly and wiring of your amplifier. W

hen

you

have

com

plet

ed th

e fo

llow

ing

step

s yo

ur ampl ifier will be re

ady

for

use.

9. ( ) Fig. 12. In

sert

the

perf

orat

ed c

over

into

the

"rai

ls" on the side pieces

and

slid

e it

forw

ard

fully

.

1) T

o ca

tch

any

wir

ing

erro

rs, i

t is

sugg

este

d th

at th

e en

tire

wir

ing

be c

heck

edpo

int-

by- p

oint

aga

inst

the

wir

ing

inst

ruct

ions

(an

d pr

efer

ably

als

o ag

ains

t the

sche

mat

ic w

irin

g di

agra

m in

ord

er to

bec

ome

mor

e fa

mili

ar w

ith th

e co

mpo

nent

layout and circuitry). W

hile

doi

ng s

o, c

heck

for

ros

in jo

ints

, loose lumps of

sold

er, p

oor

lead

s dr

ess,

and

acc

iden

tal s

hort

s or

leak

age

path

s ar

isin

g fr

om th

efl

owof

ros

in b

etw

een

cont

acts

(re

mov

e w

ith a

stif

f br

ush

dipp

ed in

car

bon

tet-

rach

lori

de, b

eing

car

eful

not

to s

prin

g co

ntac

ts w

hen

clea

ning

sw

itche

s).

10. ( ) Fig. 12. Mount the co

ntro

l pla

te o

n th

e be

zel (

loca

ting

the

hole

for

the

plas

tic p

ilot j

ewel

, abo

ve a

nd b

etw

een

the

focu

s an

d ba

ss c

ontr

ols,

ove

rth

e co

rres

pond

ing

hole

in th

e be

zel)

, usi

ng tw

o ea

ch #

4-40 x 1/4brass screws,

'410

ckw

ashe

rs a

nd #

4 he

x nu

ts to

fas

ten

it to

the

beze

l. Press the plastic pilot

jew

el in

to p

lace

on

the

cont

rol p

late

.

2) In

sert

tube

s V

I thr

ough

V12

in th

eir

sock

ets.

Be sure to insert the cqrrect

tube

in e

ach

sock

et. P

lace

a s

hiel

d ov

er tu

bes

VI,

V2,

V3,

and

V4.

See

tube

layout in instruction. In

sert

fus

e Fl

, in

fuse

hol

der.

11. ( ) Fig. 12. Fit the bezel and control plate over the projecting control

and

sl id

e sw

itch

shaf

ts, o

nto

the

ends

of t

he s

ide

piec

es a

nd th

e pe

rfor

ated

cover. Assemble the bezel to the side pieces with four #6 x 1/4 br

own

colo

red

P. K

. scr

ews.

Before tightening the screws finally, be sure there is

ade

quat

e. p

lay

to s

lide

the

perf

orat

ed c

over

out

.

3) If you have a VTVM

or

VO

M, m

ake

the

follo

win

g re

sist

ance

che

cks

befo

reco

nnec

ting

to th

e a-

c lin

e: C

heck

for

a c

old

d-c

resi

stan

ce o

f at

leas

t 1/2

0hm

across the a-c

I ine

plu

g; c

heck

for

a re

sist

ance

of

at le

ast 4

0 ohms between

grou

nd a

nd p

ins

1 of

XV

II a

nd X

VI2

; che

ck f

or a

res

ista

nce

of a

t lea

st 2

00K

Qbe

-tw

een

pin

30fX

Vll

, XV

12an

d gr

ound

. Allo

w s

uffi

cien

t tim

e fo

r th

e el

ectr

olyt

icca

paci

tors

to b

e ch

arge

d by

the

ohm

met

er b

atte

ry in

this

last

mea

sure

men

t.T

hese

mea

sure

men

ts c

onst

itute

a r

easo

nabl

e ch

eck

of th

e po

wer

sup

ply

com

-po

nent

s an

d w

irin

g be

fore

app

lyin

g po

wer

. If y

ou d

o no

t obt

ain

the

min

imum

resi

stan

ce v

alue

s in

dica

ted,

do

not p

roce

de to

the

next

ste

p un

til th

e ca

use

isdiscovered and the condition remedied.

12. ( ) Fig. 12. Fasten the perforated cover to the two tinnerman angle

brac

kets

(pr

evio

usly

mou

nted

on

the

rear

edg

e of

the

chas

sis

surf

ace)

and

the

two

angl

e br

acke

ts o

n th

e si

de b

rack

ets

usin

g fo

ur #

8 P.

K. T

y~e

Z s

crew

s.

13. ( ) Fig. 12. Set al

l con

trol

s to

the

furt

hest

cou

nter

-clo

ckw

ise

posi

tion.

Mou

nt th

e knobs on the shafts with the indicating dots pointing as fo

llow

s:IN

PUT

SE

LE

CT

OR

kno

b at

AU

X; a FUNCTION SELECTOR

at S

TE

RE

O; F

OC

US

at -5; LEVEL at 0; BASS knobs at -5; TREBLE knobs at -5.

5. (

) F

ig. 1

2. O

n th

e re

ar e

dge

of th

e ch

assi

s su

rfac

e, m

ount

the

two

tin-

nerm

an s

peed

nut

ang

le b

rack

ets,

usi

ng a #8 P. K. - T

ype

Z s

crew

for

eac

h.

14) OPERATIONAL CHECKS ON

CO

MPL

ET

ED

KIT

S: I

n th

e IN

ST

RU

CT

ION

part

of t

his

man

ual y

ou w

i II f

ind

a se

ctio

n titled "E

lect

rical

Inst

alla

tion

". Read

this

car

eful

ly a

nd c

onne

ct y

our

spea

kers

, phonograph)' and tuners to the ampl if

ier

in a

ccor

danc

e w

ith th

e in

stru

ctio

ns g

iven

. The

n re

ad th

e se

ctio

n tit

led

"Ope

r-ating Instructions II

and

oper

ate

all t

he c

ontr

ols,

che

ckin

g au

rally

for

the

resu

ltsde

scri

bed.

If

the

ampl

ifie

r do

es n

ot o

pera

te a

t all

or o

pera

tes

inco

rrec

tly, u

seth

e T

RO

UB

LE-S

HO

OT

ING

cha

rt a

nd th

e V

OL

TA

GE

& R

ES

IST

AN

CE

cha

rt

discover and remedy the difficulty. As the Trouble Shooting Chart presumes a

prop

erly

wire

d am

plifi

er, w

hich

may

not

be

the

case

, rec

heck

the

wiri

ng fo

rer

rors

or

reve

rsed

con

nect

ions

and

con

tinui

ty.

4. (

) Fi

g. 12. Assemble the le

ft a

nd r

ight

sid

e pi

eces

to th

e ch

assi

s. E

ach.

side

pie

ce is

mounted with two #8-32 x 3/8 brown colored sc

rew

s, tw

o #8

-hex nuts, and two #8 lockwashers.

6. ~ ) Fig. 12. On the bottom flange of each side piece, press a tinnerman

#8-3

2 -

Typ

e J

spee

d nu

t in

plac

e ov

er e

ach

of th

e th

ree holes. The sh

orte

rle

ngth

of

the

nuts

fac

e up

towards you.

7. ( ) Fi

12. M

ount

the

botto

m p

late

on

the

botto

m fl

ange

s of

the

side

piec

es,

using six 8-32

x 3

/8un

colo

red

scre

ws.

Not

e th

at th

e re

ar f

lang

e on

He

bot-

tom

pla

te fi

ts o

ver

the

outs

ide

of th

e re

ar c

hass

is a

pron

.

15)

If th

e am

plif

ier

is to

be

mou

nted

in a

con

sole

, rea

d ca

refu

lly th

e "M

echa

n-icol Installation II

sect

ion

of th

e in

stru

ctio

ns a

nd f

ollo

w th

e pr

oced

ures

out

l ine

d.

8. (

) F

ig. 1

2. In

stal

l the

rub

ber

feet

in th

e op

enin

gs p

rovi

ded

in th

e bo

tiom

plate. The method is

to w

ork

the

roun

ded

port

ion

of e

ach

foot

into

the

inte

rior

16)

Det

aile

d in

form

atio

n as

to c

onne

ctio

n of

pho

nogr

aphs

, tun

ers,

etc., to the

ampl

ifie

r in

puts

and

spe

aker

sys

tem

s to

the ampl ifieroutputs, os

wel

l as

a-c

line

plug connections and'

use

of th

e hu

m a

djus

tmen

t con

trol

, is

give

n in

the

"Ele

c-trical Installation"

sect

ion.

Rem

ove

the

back

ings

fro

m th

e tw

o la

rge

labe

ls s

uppl

ied

and place them on the

outs

ide

surf

ace

of th

e bo

ttom

pla

te. S

ee f

igur

e 4

for

plac

emen

t of

smal

l lab

el.

SER

VIC

E

cepted for repair. Instruments that sh

ow e

vide

nce

of a

cid

core

sol

der

or p

aste

fluxe

s w

ill b

e re

turn

ed n

ot r

epai

red.

NO

TE

: Before returning this unit, be

sure

all

part

s ar

e se

cure

ly m

ount

ed. A

ttach

a ta

g to

the

inst

rum

ent,

givi

ngyour home address and the trouble with the unit. P

ack

very

car

eful

ly in

arugged container, using sufficient packing material (cotton, shredded ne

ws-

pape

r, o

r ex

cels

ior)

, to

mak

e th

e un

it co

mpl

etel

y immovable within the con-

tainer. The or

igIn

al s

hipp

ing

cart

on is

sat

isfa

ctor

y, p

rovi

ding

the

orig

inal

inse

rts

are

used

or

suff

icie

nt p

acki

ng m

ater

ial I

s in

sert

ed to

kee

p th

e in

stru

-m

ent i

mm

ovab

le. S

hip

by p

repa

id R

ailw

ay E

xpre

ss, i

f po

ssib

le, t

o th

e E

lec-

tronic Instrument Co., Inc., 33-00 Northern Blvd., L.

C. 1

, New

Yor

k. R

e-turnshipmentwill be made by express collect. N

ote

that

the

carr

ier

cann

ot b

ehe

ld li

able

for

dam

ages

in tr

ansi

t if

pack

ing,

IN

HIS

OPI

NIO

N, i

s in

suff

icie

nt.

If y

ou a

re s

till h

avin

g di

ffic

ulty

, wri

te to

our

ser

vice

dep

artm

ent l

istin

g al

lpossible indications that might be helpful. If

des

ired

, you

may

ret

urn

the

in-

stru

men

t to

our

fact

ory

whe

re it

will

be

plac

ed in

ope

ratin

g co

nditi

on fo

r $1

2.pl

us th

e co

st o

f par

ts r

epla

ced

due

to th

eir

bein

g da

mag

ed in

the

cour

se o

fco

nstr

uctio

n. T

his

serv

ice

polic

y ap

plie

s on

ly to

com

plet

ed in

stru

men

ts c

on-

stru

cted

in a

ccor

danc

e w

ith th

e in

stru

ctio

ns a

s st

ated

in th

e m

anua

l. In

stru

-ments that are not completed or instruments that are modified w

ill n

ot b

e ac

-

MO

DE

L H

F81-

2 A

DD

EN

DA

Plea

se m

ake

the

follo

win

g co

rrec

tions

to y

our

HF8

1-2

book

:

Page

7C

, Ste

p 7.

Page 16, Symbol #R22, 23 Stock

#180

45

Schematic R22 and R23.

Part

sup

plie

d m

ay b

e du

al 5

00K

C in

stea

d of

750

KC

. Thi

s is

a d

irec

t rep

lace

men

t.It

doe

s no

t im

pair

the

perf

orm

ance

of

the

ampl

ifie

r in

any

way

.

Page 13. va, Pin 7 should read

1500

in

stea

d of

330

KC

E. 1209

Electronic Instrument Co., In

co,

Long Island City 1, N

ew Y

ork

dual 14 watt hi-fi - vintage vacuum...

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