Eico HF-81 Service manual

MODEL Hf -

general description

GENERAL

The EICO Model HF-

phonic control center and a pair of 14watt amplifiers,

on one

chassis. With it

control accurately any stereophonic source (tape, discs, or

broadcasts) and feed it through the

watt amplifiers to a stereo pair of speaker systems.

you playa monophonic

channe I adds up to a total of

systems. If you desire,

in parallel and driven byone

whi Ie the other preampl

an external power amplifier. In this way your old ampli-

fier can be put to use in a stereophonic

tion is of the "Iow silhouette

dispense with cabinetry if desired.

FEATURES

81 is a complete high fidelity stereo-

you can select preamplify, and

self-contained dual 14

When

source, the 14 watts available per

28 watts for your two speaker

both amplifiers can be connected

preamp I ifier-control section

ifier-control section is free to drive

system. Construc-

" type that permits you to

all

DUAL 14

STEREO AMP

channel) and two auxil iary B

Input Selector switch on front panel has positions for

ing FM tuner output to one

, or FM tuner to one

other

WATT HI-

- PREAMP

inputs (one in each channel).

channel and AM tuner to

channel and FM Multiplex

adapter output to other.

3. May be

preamplifiers,

set free to operate an external

other preampl ifjer-control section used to drive

ternal power

speaker connection terminals. A top -

switch permits choice of operation.

4. Ganged

used as either two independent amplifier-

or one preamplifier-control section may be

power amplifier and the

both in-

ampl ifiers

level controls and a separate focus (balance)

connected in parallel at

of-chassis sl ide

control.

5.

Independent full-range bass and treble tone controls

in each channel. Tone

controls of the low

distortion

variable cross-over feedback type.

feed-

the

1. Separate low

phono, tape head, and microphone. Circuitry

level input in each

channel for mag.

carefully

designed to provide the high gain required by tape heads

and high quality, low output mag. cartridges without

hum

and noise problems. A front panel switch permits choice

of the proper

NARTS tape head equalization for

7 1/2 & 15 or 3 3/4ips tape

2. Separate

Multiplex. Also two

high level inputs

auxiliary A

speeds.

for AM,

inputs (one in each

either

FM, and FM

6. Identical

Williamson type, push-

plifiers with high quality output

7. Hum balance

convenience outlets.

8. EICO "

zontal chassis for proper layout and component separation.

Easy console installation,

ing and adapatability to any panel thickness.

control, panel-mounted fuse, pi lot

low silhouette

Copy,;ght I1d 1958 Electronic Instrument Company, Inc.

" construction employing hori-

if desired

pull EL84power am-

transformers.

lamp,

, with complete shield-

SPECIFICATIONS *

Output Power:

1M Distortion

at 10 watts.

Frequency Response:

HarmonicDistortion:

20 watts at I

less than

28 watts continuous; 56 watts peak.

(60c &7kc at 4:

: 2% at 28 watts; 0.

(2w):I:O. 5db 10c to 1O0kc.

16 watts at less than 1% 30c to lOkc;

ess than 1 % 40 c to 10 kc; 28 watts at

1% 50c to

5kc; 8.

4 watts at

2% at 20c.

Transient Response

(4usec rise time) negligible ringing,

on 10kc square wave.

: excellent square

wave reproduction

Transient Distortion (60cps tone burst)

fu II power.

Inverse Feedback: 20db

Stability Margin:

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

12db

less than

rapid settl ing

less than 1% at

** Hum & Noise Level (below

60db; tape head - 51

iI iaries

Tone Control Range:

Speaker Connections: 4 8, and 16 ohms.

- 75 db.

::I:15db at

rated output): mag. phono

db; mic

db; tuners, aux-

- 57

50c and 10kc.

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

2 - EZ81.

Size:

Weight:

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

241bs.

* Where power output is involved, figures are given for

two channels combined; divide power output figures by

two for specifications of each

channel alone. Design

property specifications refer, of course, to either or both

channels.

flat"

** Measured with tone controls set "

maximum, and

FOCUS control set for maximum gain in

, LEVEL control

channe I checked.

Sensitivity (input for rated output):

tape head 7.

5mv; mic

5 ips - 2 mv; tape head 3.

- 6mv;

tuners, auxiliaries - 0.

mag. phono 4mv;

75 ips

5V.

mechanical installation

GENERAL

a) HEAT DISSIPATION (VENTILATION): In common with

other electronic equipment

able heat in normal operation. Unless continuous and

quate air flow is

obtained around the heat producing ele-

ments, these elements will over-

, the HF-Sl produces consider-

ade-

heat and their useful life

will be greatly curtailed.

It is useful to understand the process of convection where-

by heat is removed in judging the

Air heated by the heat-

producing elements expands and

suitability of a location.

rises; cool air is drawn from beneath to take the place of

the heated air. In

motion which continually

fier. (In particular,

major heat-

producing elements; the four EL84 output tubes

this manner, a

removes heat from the ampli-

we are mainly

and the two EZSl rectifier tubes.

ment to or constriction of the airflow, the essential

stream of air is set in

concerned with the

) If there is any impedi-

process

of heat removal will be adversely affected.

Adequate ventilation will be

installed in an open-

back console provided that the top

of the amplifier is spaced at least

shelf mounted above it.

rear, provide several large holes or

as high up in the cabinet back

nate, holes

of the cabinet.

effective ventilation requires provision for cool air

ter at the bottom and hot air to leave at the top.

may be provided in the sides, bottom, or top

The important thing to

If the amplifier is not

situated on an open surface or on a shelf of a

provided if the amplifier is

two inches below any

If the cabinet is enclosed at the

slots as low down and

as possible. As an alter-

remember is that

to en-

installed in a console, it

may be

boakcase~

Four rubber feet are also provided so that the amplifier will

not mar the surface of furniture on which it is placed.

b) EASY ACCESS TO CONTROLS: Mount the amplifier

at a height which will permit easy manipulation of the

trols. Tuner controls should be located nearby.

c) ACCESSIBILITY TO PARTS: . Tubes are the most fre-

quently replaced items in electronic equipment. If

con-

the

amplifier is installed in a console, sufficient space should

be alloted to reach and

Furthermore, input and output

should be accessible to permit easy

tem components for

connection of a portable tape recorder which is

way when not in use.

back of the console in which the amplifier is

arrange them so they will not

remove any tube in the amplifier.

terminals of the ampl ifier

interchanging of sys-

comparison, and connection or dis-

stored a-

If antennas are strung around the

installed,

interfere with access to the

amplifier.

d)

ACOUSTICAL ISOLATION:

are installed in the

same cabinet (not recommended))' pro-

If amplifier and speaker

vide sufficient separation to minimize mechanical speaker

vibration reaching the amplifier. The

minimum separation

is about one foat.

CONSOLE MOUNTING

a) 0 erationsonconsolefront anel

fier mounting:

the face of the console so that the top of the mounting sur-

face line on the template

amplifier mounting shelf. Note:

Tape the panel template provided to

is level with the top of the

reliminar to am li-

When shelf is not avail-

able, tape the template atanyconvenientspot on the face

of the console. (2) Use an awl

centers of the four extreme outer

or a nai I to pierce the

holes for mounting the

control plate, to transfer their locations to the console

panel beneath. (3) Trace out the rectangular cutout with

an awl or nail and then pierce the centers of the

holes)' one in each corner of the cutout.

panel template. (5) Drill the

sole panel, one in each corner of

area. Cut out the rectangular piece with a keyhole sawl

four 1/2" holes in the con-

the rectangular cutout

four 1/2"

(4) Remove the

using the four 1/2" holes as starting holes.

b) Am lifier mounting in console: (1) Pull off the control

knobs. 2 Remove the four screws that fasten

to the side pieces and

two screws and nuts that fasten the

bezel. The bezel

Fasten the control plate to the console panel with the two

#4x3/S wood screws supplied. (5) If the rubber feet

been inserted irwhe bottom plate, remove them. (They

be pried out with a thin screwdriver. ) (6) Place the unit -

remove the bezel. (3) Remove the

control plate to the

is not used in

console mounting. ~)

the bezel

have

may

on the mounting shelf and slide it forward until the slide

switch

slide switch accessible from the front; the control shafts

should be approximately centered in the

holes in the control plate.

the outline of the side and rear

sl,lpport bracket is

up against the panel and the

corresponding

(7) With a sharp penci!l draw

bottom edges on the chassis

shelf. As the bottom plate falls short of the full width by

3/16" on each side, draw new side edge

side the original side edge

lines. (S)

knobs and take the chassis off the shelf.

6screws which fasten the bottom plate to

Place the bottom plate exactly in the outl

shelf and mark the position of the center hole on the left

side and the center hole on the right side. (11)

lines 3/16" in-

Now remove the

(9) Remove the

the chassis. (10)

ine drawn on the

Remove

the bottom plate and dril! each of the marked holes on the

shelf to a diameter of 1/4"

plate to the chassisl withthefourof the six

previously removed, using the two holes at the

two holes at the front of the

chassis on the shelf

previously drawn, and restore the knobs. This time

l positioning

sure that the indicator dot on each

control position. (14) From the bottom side of

insert a #S

xl" screw, with a 1/2" flat

the head, through both the left and right side

These screws engage the stamped nut over each hole on

the chassis flange and when tightened secure the

to the shelf.

(12) Refasten the bottom

#8x3/Sscrews

rear and the

chassis. (13) Replace the

it exactly in the outline

make

knob agrees with the

the shelf

washer against

center holes.

chassis

electrical installation

The HF-

81 can be used in two ways

system. In all

cases, plug monophonic sources and one

for a stereophonic

track of monophonic/stereophonic sources in the channel

1 inputs; plug the other track of stereo sources in the

nel 2 inputs. It is assumed in what follows that a

phonic phono cartridge is being used. Monophonic

refers to playback of a monophonic recording with a stereo-

chan-

stereo-

phono

phonic cartridge.

a) INTERNAL POWER AMPLIFIERS OPERATED SEPARATE-

LY, EACH DRIVING ONE

SPEAKER OF A STEREO PAIR.

This arrangement is used when there is no other amplifier

the user desires to include in the system. The

SEL. sl ide switch on top of the chassis must be set

arate. Signal connections are all internal, so only

speaker connection need to shown (Fig.

la, rear chassis

SERVICE

to SEP-

the

view). The internal arrangement ion in the HF-81 at each

of the positions of the FUNCTION selector are

Figs. Ib, lc, Id

, Ie, If

, and 19, as an aid to understand-

shown in

ing the operation with this arrangement.

FIG.

CHECK AMPL. 1

CH. I LOW

LEVEL INPUTS

CH.

IPREAMP~

16 8

32

(J) (J) (f)

TO MATCHING

TAP

FIG. la. SPEAKER CONNECTIONS

CH. 1 HIGH

LEVEL INPUTS

CH.

CH.

SPKR.

CH. 1

TAPE OUT

CH.

32

(J)

TO MATCHING

TAP

POWER AMP

CH.

SPKR.

SPEAKER

CH.

FIG.

CHECK AMPL. 2

FIG. Id

STEREO NORMAL

FIG. Ie

STEREO REVERSE

CH. 2 LOW

LEVEL INPUTS

CH. 1 LOW

LEVEL INPUTS

CH. 2 LOW

LEVEL INPUTS

CH. 1 LOW

LEVEL INPUTS

CH. 2 LOW

LEVEL INPUTS

PREAMP

CH.

~:'~P

CH.

2HIGH CH.

CH.

LEVEL INPUTS T APE OUT

CH. 1 HIGH

LEVEL INPUTS

2 HIGH CH.

CH.

LEVEL INPUTS

CH. 1 HIGH

LEVEL INPUTS

CH.

TAPE OUT

SEP ..

TAPE OUT

CH.

TAPE OUT

SEP

POWER AMP

SERVICE SEL.

I PO

CH.

AMP

SPEAKER

CH.

SPEAKER

CH.

~~~~R

SPEAKER

CH.

SPEAKER

CH.

CH. 2 HIGH

LEVEL INPUTS

CH.

TAPE OUT

FIG.

MONOPHONIC

TAPE, TV

TUNER,

CH. 1 LOW

LEVEL INPUTS

CH. 1 HIGH

LEVEL INPUTS

CH.

TAPE OUT

SEP

CH.

TAPE OUT

SPEAKER

CH 1

SPEAKER

CH.

CH. 1 LOW

LEVEL INPUTS

FIG. Ig

MONOPHONIC PHONO

2 LOW

CH.

LEVEL INPUTS

b) INTERNAL

TOGETHER AT THE INPUTS AND

OUTPUTS) TO DRIVE ONE SPEAKER OF A STEREO PAIR.

This arrangement is employedwhen the useralready has a

high quality amplifier (usually 20watts or more if it is to

be worthwhile) which he desire to include in the

The preamp-

ular CHI tone control feeds the

amplifiers; the preamp-tone control combination including

the regular CH2 tone control feeds out

TAPE OUT jack to an external power

VICE SELECTOR switch on

COMbined position for this service in order to disconnect

the input of the CH2 power amplifier

the CH2 tone control and connects it instead to the input

of the CHl

amplifiers are paralleled at the outputs

external jumper connected between corresponding speaker

connection taps, The external

speaker connections are shown in Fig,

arrangements in the HF-

FUNCTION selector are

, and 2g, as an aid to

this arrangement.

POWER AMPLIFIERS COMBINED (TIED

PARALLELED AT THE

system.

tone control combination including the reg-

combined internal power

through the CH2

amplifier. The SER-

the chassis must be set at the

from the output of

power amplifier, The CHI and

CH2 power

, as shown

, by an

signal connection and the

2a. The

81 at each of the positions of the

shown in Figs. 2b,

understanding the operation with

internal

2c, 2d, 2e,

CH. 1 HIGH

LEVEL INPUTS

2HIGH CH.

CH.

LEVEL INPUTS

TAPE

OUT

.INPUT

* On integrated

OUTPUT lack; on HF521 feed into

OVER INPUT jack,

ELECTRONIC CROSSOVER IN and

CH.

T APE OUT

SERVICE SEL

SEP

T APE OUT

CH.

BASIC

~RNA

EXT

POWER AMPLIFIER

~~~:MP

amplifiers HF20,

after severing

FIG. 2a. SPEAKER &

SIGNAL CONNECTIONs.

SPEAKER

CH.

SPEAKER

CH.

CH.

(f)

. I

::! I

:Q it

~ i

~ I

'" I

a I

"" I

1___-

HF32 feed into

ELECTRONIC CROSS-

connection between

OUT jacks.

EXTERNAL

TAPE

FIG.

CHECK AMPL.

CH. 1 LOW

LEVEL INPUTS

CH. 1 HIGH

LEVEL INPUTS

CH.

TAPE OUT

SPEAKER

CH.

FIG.

CHECK AMPL. 2

CH. 2 LOW

LEVEL INPUTS

CH. 2 HIGH

LEVEL INPUTS

CH.

TAPE OUT

SPEAKER

CH.

FIG.

STEREO NORMAL

FIG.

STEREO REVERSE

CH. I LOW

LEVEL INPUTS

CH. 2 LOW

LEVEL INPUTS

CH. I LOW

LEVEL INPUTS

CH.

2 LOW

LEVEL INPUTS

CH. I HIGH

LEVEL INPUTS

CH.

2 HIGH

LEVEL INPUTS

CH.

TAPE OUT

SPEAKER

CH.

CH.

TAPE OUT

SPEAKER

CH.

SPEAKER

CH.

FIG.

MONOPHONIC

T APE,

TUNER,

CH. I LOW

LEVEL INPUTS

CH. 2 HIGH

LEVEL INPUTS

CH. I HIGH

LEVEL INPUTS

CH.

TAPE OUT

SPEAKER

CH.

SPEAKER

CH.

CH.

TAPE OUT

SPEAKER

CH.

FIG.

MONOPHONIC PHONO

CH. 1 LOW

LEVEL INPUTS

2 LOW

CH.

LEVEL INPUTS

CH. l HIGH

LEVEL INPUTS

CH.

T APE OUT

SPEAKER

CH.

COM

c) INPUTS: There are identical pairs of MAG. PHONO,

TAPE HEAD

ILIARY B inputs -one of each pair in

MICROPHONE, AUXILIARY A, and

channell and chan-

AUX-

nel 2 - and each is identified accordingly by the suffix

1 or 2. The MAG. PHONO,

TAPE HEAD

PHONE pairs of inputs are all II low level" inputs, mean-

ing that they all feed through a preamplifier/equalizer

stage in either channel

AUXILIARY Bpairsofinputs are

ing that they enter either channel

the preampl ifier/equalizer stages.

FM Multiplex inputs are also "

are internally selected in pairs

- by the

INPUT SEL. switch.

l or 2. The AUXILIARY A and

high level" inputs, mean-

l or 2 at a point after

The AM, FM and FM-

high level inputs , which

- one for each channel

At the MONAURAL posi-

tion of the FUNCTION SEL., AM only is selected at

FMposition of the INPUT SEL., and FMonlyis select-

AM-

ed at the FM - FM MULTI. position of the

l) MAG.

are intended for the two outputs of a stereo magneti c car-

tridge, or for a stereo

The correct method for wiring a three terminal cartridge

is shown in Fig. 3. If the cartridge is a four terminal

type)' short the two inside

PHONO 1, MAG. PHONO 2: These inputs

ceramic cartridge with adaptors.

terminals of the cartridge to-

MICRO-

, and

INPUT SEL.

the

gether and treat it exactly as if it were the single center

terminal shown in Fig. 3.

The loading presented to each

output of the cartridge by each MAG. PHONO input is

100,000 ohms. If

by the particular cartridge used, connect a shunt

of appropriate value from each outside terminal of the car-

tridge to the center

actually by mounting a 3-

side of the phonograph mounting board at a

lead break-out from the pickup arm.

are then wired to this terminal strip as

The value of each of the

a lower loading resistance is

(common) terminal. This can be done

post terminal strip on the under-

These shunt resistors

shown in Fig. 3.

two shunt resistors (Rs) can be

determined from the desired loading resistance (RI) by this

100,

formula

Rs =

or th is tabl e; for RI = 50KQ, use

use Rs = 50KQ; for

RI = 25KQ, use

000 x RI

00)' - RI

Rs = 1 OOKQ; for RI

ohms

Rs = 33KQ.

required

resistor

point near the

:: 33KQ,

2 HIGH

CH.

LEVEL INPUTS

CH.

T APE OUT

SPEAKER

CH.

* NOTE: All ceramic cartridge manufacturers have devel-

oped simple networks which when

connected the outputs

of their cartridges result in a characteristic identical to

that of magnetic

mended adaptor for the

cartridges. By interposing

particular ceramic cartridge be-

tween the cartridge outputs and the MAG.

puts of the ampl ifjer, it is possible to use the MAG.

inputs for the ceramic cartridge

Adaptor networks are given in

ticular ceramic cartridge

and can be built on a terminal

strip mounted on the underside of the

may be available in convenient

with excellent

the literature for the par-

phonograph base, or

component form from the

cartridge manufacturer. Stereophonic

(Ronette "

rectly to auxiliary high level inputs.

2) TAPE HEAD

Binofluid II OV and BF40) can be connected di-

1, TAPE HEAD 2: These inputs are in-

the recom-

PHONO in-

PHONO

results.

crystal cartridges

tended for direct connection to the two outputs of a stereo

tape playback head. A front panel slide switch permits

choice of NARTB tape head equalization

(& 15) ips or3

presented by each tape head input is 100,000 ohms.

3) MICROPHONE 1, MICROPHONE 2: These inputs are

314

ips tape speeds. The loading resistance

either for71/2

intended for rec~~:ving the output signals directly from

two separate microphones. It is preferable that the micro­phones used be of the high impedance type.

4) AUXILIARY AI, AUXILIARY A2: These inputs are

intended for either a stereophonic or monophonic high

level source. A stereophonic high level source might be

a stereo tape deck with built-

for both tracks.

A monophonic high level source might

be a monophonic crystal cartridge or tv sound.

monophonic source intoAUXJLlARY A 1, leaving

ILIARY A2 input unused. Note that the input

at all these high level inputs is 0.

low for ceramic cartridges requiring 2 to 3 megohms in-

put impedance. For

ceramic cartridges, use the MAG.

PHONO inputs with the simple adaptor networks recom-

mended by the manufacturers. For

cartridges (Ronette "Binofluid" OVturnover and BF40 sin-

gle needle), the 0.

5 megohm load provided at the high

level inputs is exactly the loading impedance required.

in playback equal ization

Plug a

theAUX-

impedance

5 megohm, which is too

stereophonic crystal

STEREO MAG.

CARTRIDGE

5) AUXILIARY Bl, AUXILIARY

ILIARY A 1, AUXILIARY A2 above.

6) AM: This input is intended for AM tuner or the AM

output of an FM-AM tuner where the FM

are independent.

B2: Same as for AUX-

and AM sections

FIG. 3

TO MAG.

INPUT

TO MAG. INPUT 2

mentioned sources to the correspondmg

jack. Unless the source has a low-impedance output such

as a cathode follower (with which up to 50ft.

can be used), use the shortest possible connection and

low - capacity shielded cable (cable having

amplifier input

of cable

as low as

25mmfd capacitance per foot is available).

7) FM:

where the FM and AM sections are independent.

8) FM MULTIPLEX: This input is intended to receive the

This input is intended for an FMor FM-

AM tuner

output from an FM Multiplex adaptor.

NOTE: A shielded cable with a shielded "

plug should be used to connect from each of the above-

HF 81

phono-type

TAPE

OUT

cgJ

e) POWER CONNECTIONS: The line

must be plugged into a house outlet providing normally

117 volts, 60 cycles AC power.

tacle on the rear chassis can be used, if desired

cube tape to provide

equipment. This convenience receptacle is not switched

or fused and provides 117VAC at all time'S""rregardless

of whether the HF-81 is turned on or off.

HUM ADJUSTMENT

After checking the ampl ifier for proper operation, remove

all input cables to the amplifier and make the following

control settings which hold throughout the process of hum

adJustment: INPUT

SELECTOR at STEREO, FOCUS control at 0,

trol at 10)' both TREBLE controls at -5, both BASS controls

at 0; the two speaker systems must be in phase

near one another for this

-=8

2 - PHONO RECEPTACLE

STRIP

cord of the HF-

A convenience recep-

, with a

117VAC power to the associated

SELECTOR at PHONO, FUNCTION

LEVEL con-

and placed

adJustment. Next, procede

FIG. 4

d) TAPE OUTPUT 1, TAPE OUTPUT 2: When no

amplifier is used in the system,

available for feeding out to a stereo recorder. When an

external power ampl ifier is used in the system,

PUT 2 is used to feed out to

the external power amplifier.

If it is desired to do stereo

conditions, construct a device such as

both these outputs are

recording under the latter

shown in Fig. 4.

external

TAPE OUT-

Use low capacity shielded cable for connections.

TO INPUT

OF STEREO

RECORDER

6 ,

TO INPUT 2

OF STEREO

RECORDER

TO EXTERNAL

POWER AMPLIFIER

follows: With your ear held close to the speakers, insert

the amplifier power plug into the wall outlet and listen
to the hum level. Now pull out the plug and re-insert it

with the prongs reversed. Choose the prong position with

the least hum. Now connect the tuner input connector to

the amplifier input jack, and with the tuner set

stations and the tuner volume control set at a minimum, do

between

the same with the power plug of the tuner; use either the

117VAC receptacle on the HF-

cube tap inserted in the 117V AC receptacle on the HF-

Next)' connect the phono cartridge leads to the MAG.

PHONO 1 and 2 inputs, and, with turntable

up arm at the rest position, find the insertion position of

the turntable line cord plug that yields lowest hum. Fin-

81 or one receptacle of a

off and pick-

ally, connect the tape head leads to the TAPE HEAD

and 2 inputs, and, with the tape deck turned

insertion position of the tape deck line cord plug that

sults in lowest

just the hum balance control on top of the amplifier chassis

for least hum.

hum. When

all of this is completed, ad-

offl find the

81.

re-

operation

PRELIMINARY: Be sure all tubes are

sockets and that the tube shields are making good contact

firmly seated in their

with their baSes. As initial adjustments, set these controls

as follows: LEVEL at 0, FOCUS at

at O. Turn the amplifier on by turning the

trol clockwise from AC OFF and set it at zero

Also set the

TREBLE 1 control

0)' both BASS controls

TREBLE 2 con-

initially.

at zero. Please note that

in the instructions that follow, it is assumed that a stereo

pick-

up and/or a stereo tape head is being

the system.

LISTEN IN G TO

TOR to PHONO if you

PHONOGRAPH: Set the IN

have a megnetic cartridge or a

employed in

PUT SELEC-

ceramic cartridge with adaptors interposed between the

cartridge outputs and the MAG. PHONO

(The RIAA equalization provided at the PHONOposition

is now the international standard in the recording industry

for both monophonic and stereophonic records and is also

a very good compromise for the most important of

monophonic recording characteristics.

SELECTOR to AUX Aor AUX B if you are using a stereo-

1 and 2 inputs.

) Set

the INPUT

the older

phonic crystal cartridge (Ronette) connected to eitherAUX

A or AUX B inputs. Set the FUNCTION

either STEREO position.

channels, playa conventional monophonic

To balance levels between the

cording on the changer or turntable and turn the

control up until you have

that the action of the

normal listening level.

FOCUS control (sometimes called a

SELECTOR at

(lateral) re-

LEVEL

Note

balance" control) is to simultaneously raise the level in

one channel while lowering the level in the other as it is

turned in anyone

FOCUS control)' equal sound volumes would

channels only if the ideal conditions of identically effi-

cient loudspeakers and identical overall gains in both

direction. At the zero

setting of the

obtain on both

channels existed. With the conventional monophonic re-

cording being played

volume from each speaker system.

, adjust the FOCUS control for equal

With the

FOCUS set-

ting properly made, any stereo recording played back will

have close to the same balance as actually exists in the

recording. The

manent adjustment in that

FOCUS control setting can be a semi-

, at any given time, the setting

per-

achieved as described above will usually be satisfactory

for tape stereo, and

may also be for broadcast

stereo, if

it means exist of adjusting for equal output levels from the

stereo broadcast rece iving equ ipment. As

a shift of the

normal FOCUS control setting may be nec-

components age,

essary. Note that there are a concentricpairofbass con-

trois, one in each channel and a concentric pair of treble

controls, one in each channel. Use the

treble controls to

of the recording from the standard recording characteristic,

as well as to

of your audio system (including room acoustics). Set the

FUNCTION SELECTOR to

REVERSE for

compensate for any audible deviation

compensate for the over-

STEREO NORMAL or STEREO

stereophonic records and to MONOPHONIC

PHON 0 for CONVENTIONAL MON OPHON IC records.

LISTENING TO TAPE DECK

(direct connection to tape

separate bass and

all characteristics

head): Set the INPUT SELECTOR to TAPE. NARTB tape

head equalization is provided in both channels for

tape speed selected with the

~nel'- One position is

for71/2and

TAPE switch on the front

15ips tapes and the

the

other for 3 3/4 ips tapes. These equalizations are the

industry standard for pre-recorded stereophon i

phonic tapes.

described in the preceding paragraph

satisfactory for this function also.

If the FOCUS' control has been set as

, it will usually be

Otherwise, it may be

set in a similar manner using a test tape or

Set the FUNCTION SELECTOR to STEREO NORMAL

REVERSE for

TUNER

TREBLE tone controls as described above.

LISTENING

ED TO AUXILIARY AI, AUXILIARY Bl

PHONIC AM BROADCAST, OR

BROADCAST: Set the

AUX.

FUNCT10N SELECTOR to MO~OPHONIC

Use the BASS and TREBLE controls as described previous

LISTENING TO A STEREOPHONIC SOURCE CONNECT-

ED TO AUXILIARY Al and

stereophonic tapes or to

, AUX for

monophonic tapes. Use the BASS

TOAMONOPHONIC

, AM-FM, or FM-

SOURCE CONNECT-

TO MONOPHONIC FM

INPUT SELECTOR to AUX. A,

MUL TI.

A2, AUXILIARY B1 and B2,

respectively and the

AM and FM, FM and FM MULTIPLEX: Set the INPUT

SELECTOR to AUX A,

respectively. Set the

AUX B, AM-FM, or FM-MUL TI

FUNCTION SELECTOR

NORMAL or STEREO REVERSE. The FOCUS, BASS and

TREBLE controls are set as described previously.

MAKING

by connecting the recorder to the

See "TAPE OUTPUT 1,

TRICAL INSTALLATION. Please

cannot be made on tape decks

RECORDINGS: Tape recordings may be made

TAPE OUTPUT jacks.

TAPE OUTPUT 2" under ELEC-

note that recordings

unless those decks are

c and mono-

simply by ear.

MONOPHONIC

and

, TO

MONO-

TUNER, AUX.

at STEREO

I y.

equipped with the electronics required for recording.

FUNCTION SELECTOR: The STEREO NORMAL and STER-

EO REVERSE positions

production. At the

are both used for stereophonic re-

STEREO REVERSE

position, the chan-

nel 1 and channel 2 amplifiers from the tone controls to

the speaker connections are interchanged.

These two

positions permit interchanging the signals fed to the two

speakers so that the correct

orchestra can be achieved on all recordings or broadcasts.

The CHECK AMPL. 1 and CHECK AMPL. 2 positions per-

mit hearing either channell alone or

comparison or balancing purposes during stereophoni

left to right display of the

channel 2 alone for

c use.

The MONOPHONIC TUNER, AUX position is used for

monophonic FM, AM, tv

ridge monophonic pre-

nel 1 inputs. At this

are unused in this type of operation, are disconnected

from t

he active channel so that they cannot

interference. At the MONOPHONIC PHONO

the channell and 2

is useful when playing monophonic records with

phonic cartridge to cancel vertical rumble

sound)' monophonic phono

amplified tape etc., fed into chan-

position)' the channel 2 inputs which

contribute

position,

corresponding inputs are mixed

, which

a stereo-

components.

cart-

BASS CONTROL 1,

The plus sign on the right side of the dial indicates that

clockwise rotation from the mid-

increases (boosts) _

side indicates that counter-

BASS CONTROL 2 (CONCENTRIC):

point (0) of either control

bas~ response; the minus sign on the

clockwise rotation from the

left

mid-point decreases (cuts) bass response. There is no in-

teraction with the

TREBLE

control.

with this control set at the mid-

the "flat" position since bass response

Start all adjustments

point (0), which is called

is neither cut nor

boosted at this position.

maintenance

TREBLE CONTROL

TRIC): The plus sign on the right side of the

that clockwise rotation from the mid-

1, TREBLE CONTROL 2

(CONCEN-

dial indicates

point (0) of either

control increases (boosts) treble response; the

indicates that counter-

point decreases (cuts) treble

action with the

this control set at the mid-

flat" position since treble response

BASS control.

clockwise rotation from the mid-

response. There is no inter-

Start all

point (0), whi ch

adjustments with

is called the

is neither cut nor

boosted at this position.

minus sign

GENERAL

Your amplifiershou Id require I ittle

mal tube replacement. We

recommend no substitutions for

service except for nor-

the tube types used in this amplifier except as stated. All

the tube types used are distributed national Iy, but

ments can be obtained directly

To facil itateservicing, remedial and trouble-

cedures have been provided in the TROUBLE-

CHART that follows.

CHART is also provided

A VOLTAGE AND

from EICO if desired.

as an aid in

locating defective

replace-

shooting pro-

SHOOTING

RESISTANCE

components. DC operating voltages are given both at no

signal and signal developing 14 watts

output, as well as

the corresponding 1 kc signal voltages.

TROUBLE-SHOOTING PROCEDURES

Connect the leads from the

two speakers to the amplifier.

as described in the section "

stereo cartridge and from the

These connections are made

Electrical Connections "

the 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 speaker

of if the output is

low or audibly distorted

checks for those symptoms. If there is

. the output

ampl ifier and short the phono input

, disconnect the phono input cable

hum disappears, the trouble is not

, procede to the

excessive hum in

from the

jack to chassis. If the

in the amplif.er but in

the phonograph or in the connection to the amplifier.

each case, check for the trouble in the amplifier which

seems defective. If both

the power supply.

The cause of phonograph hum may be a

not grounded to the cable shield (try a good single ground

amplifiers are defective, check

metal pick-up arm

connection to the cable shield from turntable frame, pick-

up arm, and cartridge case), direct

hum pick-up by the

magnetic cartridge from the record player motor(tryusing

a rubber mat on the turntable to increase the separation of

the pick-up from the motor), or pick-up from a power

transformer or other magnetic

moving phonograph away from suspected source). Check

also that the phono input cable shielding is

the ampl !fier chassis at one point only, through

of the input connector where it

Finally, try a good building ground

field in the vicinity

grounded to

the skirt

plugs into the ampl ifier.

such as a connection

from a cold water pipe terminated under speaker terminal

. Set

(try

G" on the amplifier

to other

components in the system

channel be connected to the amplifier

shielded cable to the ampl ifier

that the ground leads on both cables not be

gether at any point

ever, with some

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

Excessive hum on other inputs may be checked in

Do not connect such a ground wire

If possible, let each

using a separate

input. It is

- not even at the cartridge. How-

cartridges, it will not be possible to do

also desirable

connected to-

a similar

manner. Disconnect the input cable in question and short

the particular input jack to the chassis. If the hum dis-

appears, the trouble is external to the amp!

that on all

nect to the ampl ifier only

connector. The cause and remedies for the following

symptoms are then based on the

inputs, the braid of th;;; input cable shou Id con-

through the skirt of the input

assumption that checks

ifier.

Note

made in the manner described above have eliminated the

possibilityof the trouble being external to the amplifier.

If the trouble is no output or low output

, check AC signal

voltages and DC operating voltages starting at the input

and work step_

fier. Set the

FOCUS, BASS and

(0), the INPUT SELECTOR to PHONO and

TION SELECTOR

wave signal

Square Wave Audio Generator In addition, use a pre-

cision 100: 1 attenuator to permit obtaining a

0035 volt fed into MAG. PHONO

erator output of 0.

onthelowestACvolts range ofyourVTVM

signal to hum from generator). Use a high

ance VTVM for all

VTVM or 20,

. If the trouble

replacement, signal tracing, or procede

tage and resistance measurements.

When the defective stage is local ized, procede

by-step toward the output in each ampl i-

VOLUME control to

TREBLE controls

to STEREO

, such as supplied by the EICO 377 Sine &

maximum (10), the

to their mid-points

the FUNC-

. Use a 1000cycle sine-

level of

from an audio gen-

35 volts, which can easily be measured

(also improves

input imped-

AC signal voltage

OOOQ/v

YOM

for DC volts measurements.

measurements; a

is an excessively distorted output, try tube

directly to vol-

to a resist-

ance and voltage check of the stage, using the data in the

VOLTAGE and

RESISTANCE chart.

Disconnect theampli-

fier from the power line and discharge capacitors prior to

making any resistance check and prior to removing any or

all of theEL84output tubes.

with any of the output tubes

Do not turn the amplifier on

remove

CHECKING A

1. Check tube.

2. Check plate and cathode resistor.

3. Check

4. For output stage, check dc

TYPICAL TUBE STAGE

coupl ing capacitors for leakage or short.

resistance of transformer

windings.

5. Check grid leak resistor for open.

6. Check cathode

7. If

no or

path for open or defective R60,

by-pass capacitors for short.

low B+ voltage on tube, check decoupling

R61, R62, R63 and fiI ter

capacitor C37, C38 or C39.

8. . If wiring and circuit

check O. K. and B+

coupl ing path for short or

Suspected trouble in the

volume controls and networks should lead to specific

components including the tube

voltage is

excessive)' check the de-

defective R60, R61,

R62and R63.

equalization)' tone, focus, and

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 tone

controls, the amplifier should be tested thoroughly

audio generator, vtvm, and scope.

with

SPEAKER PHASING

IMPORTANT NOTE ON

loudspeaker systems must be

in phase, meaning that corresponding cones or diaphragms

SPEAKER PHASING:

connected so that they operate.

in the systems move in and out together when

The two

actuated by

the same or similar signals. A simple method of checking

this is to playa conventional monophonic (lateral)

record-

ing having considerable bass program material, setting the

FUNCTION SELECTOR at MONAURAL. After listening

for a few minutes, reverse the connections of the speaker

leads at only one of the speaker

systems - not both

- and

listen again to the same program material. Normally, you

wi 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-phase

connection and should be used.

Another criterion for the in-phase connection is that of

blending, which can be best applied if the speaker

are identical or at

frequency range reproducers. With the in-

least have similar middle

nection and both speakers operating at approximately the

same volume level, a monophonic

emanating from a point mid-

speakers will blend. With the out-of-

source will appear to be

way between and the two

phase connection,

systems

and high

phase con-

the two sources will appear to remain separate.

SERVICE

If trouble developes in your instrument which

remedy yourself, write to our service

all possible indications that might be helpful.

you can;.,t

department listing

If desired

you may return the instrument to our factory where it wi

be placed in operating condition for $12.

of parts replaced due to their being damaged in the

of construction.

sure all parts are securely

instrument, giving your home address and the trouble with

the unit. Pack very carefully in a rugged

NOTE: Before returning .

mounted. Attach a tag to the

ing sufficient packing material (cotton,

50 plus the cost

course

this unit, be

container)' us-

shredded news-

paper, or excelsior), to make the unit completely immov-

able within the container.

is satisfactory, providing the original

sufficient packing material

ment immovable.

possible, to Electronic Instrument Co.,

ern Blvd., Long Island City I,

mentwill be made byexpress collect. Note that a

Ship by prepaid Railway

cannot be held liable for

The original shipping carton

inserts are used or

inserted to keep the instru-

Express, if

Inc., 33-

New York.

00 North-

Return ship-

carrier

damages in transit if packing

IN HIS OPINION)' is insufficient.

TROUBLE-

SHOOTING CHART

SYMPTOM

Amplifier causes power line fuse to

blow. Power line

with VII &

fuse blows again

V12 out of their sockets.

Amplifier causes power line fuse to

blow. Power line fuse

again with VII &

does not blow

V12 out of their

sockets.

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 specified

below.

a) No

voltage.

CAUSE

Line cord, J16, primary or high voltage

secondary windings of T1 shorted internally

or externally (wiring).

VII, V12, C39)' V7, va, V9,

T3 primary shorted internally or

VI0, or T2

exter-

nally.

Open tube fil ament.

Open lead from 6. 3V winding of T1.

6 3 V winding of T1 open.

R56, R57.

Open

Defective VII or V12.

C39 shorted internally or externally.

REMEDY

Replace or repair.

Replace or repair.

Replace or repair.

Replace or repair.

Replace

Replace or repair.

b) High voltage.

c) Low voltage.

Excessive hum on mag. phono tape

head or mic.

Excessive noise on mag. phono

tape head or mic.

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.

leads dressed toa close to grid

FiI.

lead.

Tube shield not making electrical con-

tact to base or base not

trical contact to chassis.

making elec-

Shielding and grounding of wiring to

input jacks not exactly as instructed

and shown in drawings.

VI and V2 and contacts dirty.

Repair

Repair

Replace, repair, or see trouble­shooting typical tube stage.

See trouble-shooting typical tube

stage.

Replace

Replace

Dress fit. leads

Check and correct.

away from grid lead.

Correct

Clean throughly with carbon

tetrachloride.

Sustained oscillations.

Sustained microphonicson mag.

phono, tape head or mi c.

Hum on all inputs.

Poor dress of output transformer T2 or

T3 leads.

VI or V2 defective.

V3 or V4 defective, not properly

shielded, or dirty sockets and contacts.

Dress of power transformer T1 leads.

Dress all input leads and T3 leads

away from each other. Keep T3

leads away from input jacks.

Replace

Replace, correct

, or clean.

Correct

VOLTAGE AND RESISTANCE CHART

TUBE

CC83(12AX7

ECC83/12AX7

ECC82/12AU7

V3, V4

PIN# OPERATING VOLTS

AT NO SIGNAL

(DC UNLESS NOTED)

4&5

filament (OVDC; 6. 3VAC to pin 9)

filament

4&5

4&5

filament (OVDC; 6. 3VAC to pin 9)

fi lament

filament (OVDC; 6.

1. 8

filament

OPERATING VOLTS

AT 14W OUT

(DC UNLESS NOTED)

3VAC to pin 9)

1. 75

SIGNAL VOLTS

(1 kc) at 30W OUT UN IT DISCONNECTED

014

OHMS

FROM POWER)

290KO

IMO

7KO

500

290KO

0035

90KO

2KO

500

290KO

IMO

7KO

500

290KO

90KO

2KO

500

1. 2

. 1

120KO

61OKO

3KO

500

170KO

190KO

065

8KO

500

ECC83/12AX7

V5, V6

EL84(6BQ5

EL84(6BQ5

195

4&5

filament (OVDC; 6. 3VAC to pin 9)

filament

12.

4&5

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

335

330

12.

4&5

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

-,7 335

190

1. 15

1. 1

,1,

14.

325

320

14. 03*

325

180

6 2

180

100KO

470KO

100KO

500

470KO

250KO

7KO

500

340KO
340KO

1650

500

330KO

165 1900

330KO

3500

340KO

340KO

1650

500

330KO

330KO

330

320

3500

EL84/6BQ5

V9, V10

4&5

0 6.

12. 7

filament (OVDC; 6. 3VAC between pins 4 & 5)

14. 7 . 03 *

340KQ

340KQ

165Q

50 Q

EZ81/6CA4

VII, V12

All resistance measurements, except those

made with pin 3 of V11 and V12 grounded.

to chassis with the controls set as follows:

to STERO NORMAL)' LEVEL at

at 14W output

signal to the CH 1 &

load to the output of each amplifier, of equal resistance to the tap selected

handling 15 watts. Voltage measurements are made with a

voltage measurements are made is 117VAC, 60cps.

NORMALLY BY::I:15%.

335

330

290 V AC *

340 335 7.

4&5

* = 60 cycles

, set the input selector to the PHONO position

filament (340VDC; 6. 3VAC between pins 4 & 5)

290V AC *

made from pin 3 of Vl1 and V12

All voltage and resistance

INPUT SELECTOR to

10, BASS, TREBLE & FOCUS controls at O. For voltage measurements

CH 2 Mag. Phono Input jacks; connect a resistive (preferably non-

325

320

29OV AC* 290*

290V AC *

PHONO, FUNCTION SELECTOR

and feed a O. 0035volt

VTVM. Operating line voltage atwhlch

NOTE: ALL VOLTAGE &

180

290* 45-

measurements are measured

(::1:20%), and

165- 190 Q

330KQ

350Q

45-55 Q

100KQ
100KQ

(EZ81 rectifier),

(;3. 5mv) 1 kc

inductive)

capable of

RESISTANCE VALUES

55 Q

are

INPUT

SELECTOR

SWITCH

S 1

SECTION

AUXA

11- 10-11- 10- 12

10-

AUX B AM-FM FM-

11- 11-

MUL TI MIC

2-6-

PHONO

10- 10- 11-

10-

TAPE

11-

3- 7

4-11 1 -4-

10-

10-

10- 10- 10-

SECTION

FUNCTION

SELECTOR
SWITCH

1) Entries are numbers of those switch contacts

AMPL. 1

4- 10

AMPL. 2

which are connected together by the

NC means no connection.

2) On schematic diagram, all switch wafers shown in the

seen from the front or shaft end.

2-4- 3-4-

3-6-

10-12.

NORMAL

9- 1 0-

REVERSE TUNER AUX.

10- 10- 10-

1":12

10- 10-11

3-4-7

rotors at the

maximum counter_clockwise position (AUXA and CH

TOP VIEW

particular position.

PHONO

1CHECK)as

~~Lhttps://manualmachine.com/6BQ5

~'-'t'~

MODEL HF-

DUAL 14 WATT HIGH FIDELITY 140 WATTS

INTEGRATED AMPL"'ER

ECC83/12AX7V ECC82/12AU7V

3 AMPS 117 VAC

(Q)

ITJJ 10

ECC83/12AX7

ECC83/12AX7

r'\ V-

iUEIiJ.

MODEL HF-

DUAL 14 WATT HIGH FIDELITY

INTEGRATED AMPLIFIER

TAPE OUT SPEAKER CONNECTIONS

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

r'\ r'\ V-

V V

r'\

FRONT

0 0 001

CH- 2

CH.

CHANNEL 2 CHANNEL 1

~~~84/6BQ5

ECC83/12AX7

r'\V-

VECC82/12AU7

100000\

r'\V-

11 r'\V-

VEZ81 \JEZ81

OAM

OFM

000

MIC PHONO TAPE

CHANNEL 1

AUX A

AUX B

MULTIO

000

MIC PHONO TAPE

CHANNEL 2

OPERATES FROM ""V

SO/6C CYCLE AC LINE

POWER CONSUMPT'ON.

ELECTRONIC INST. '

noo NORTHERN BLVD

L , CITY 1 N Y

CO.. INC.

REPLACEMENT PARTS LIST

Stock'

20050

23014
23020
22517

22514

22518

22550.

22506

20039

22520

22529
22543

23007

22533

24005
23016
20043

22519
91005

92000

50020

50018

50011

50016 J16

"'" 29751

10407

10400

11526

10423
10430

11504
11527

10422
11518

_18045

---., 8046

10435

10414

18048

18047

10410

10420

10431

11543
10412

14600
11538

10851'

10952
14302

19009

10421

60057

60065

62000

62002

30021

32013 T2, 3

54516

54002

54001

54014

54003

54006

54013
54008

Symbol

Cl,

C3,
C5,
C7,

C35, 36

C9,

Cl1,

C13,
C15,

CI7, 18,
CI9, 20,41,

C23,

C25, 26, 27, 28

C29,

C31, 32, 43, 44

C37

C38,

C40

C47, 48

JI-

J5-

10.

11-12-

J14-

PCl,

Rl,

R:r,4,

53, 54,

RS, 6, 11

R13

R15,

RI7 18, 44,

46,

20, 60

R19

R2I,

R22, 23
R24, 25

R26,

R28, 29

R30, pot., IMQ, linear

R32, 33, 54
R34, 35

R36,

R38,

R42, 43

R48, 49,

RS6, 57

RS8, 59

R61

R62

R63

R64 pot" 100Q

R70, 71

TB1,

TB3,

T84 terminal strip, IP right

TB5

TB6,7,

TB9, 11, 18

TBIO, 19 terminal strip, lP left w/ground

TBI2, 14

Description
cop. , paper

cop.,

cap.,

cap., disc., . 025mfd, GMV (25K or 25,

33,

, 45, 46

cap.,
cap.,

cap.

cop.

21, cap.,molded,.

cap.,

cap. disc., 150mmf, "'10%

cap.,

cap., elec., 5Omfd, 25V

cap., disc., 47mmf, "'10%

cap.

cap., elec., 30mfd,

cap., molded, .
cap., disc., . 0Imfd,

fuse, 30mp

pilot light, '47

jack, quad,

jack, triple

jack, dual

outlet, convenience

printed circuit

res., IMQ,

res., 10KQ

40, 41,

res., 200KQ,

res., 2. 2KQ,

res., 4.

res., 90KQ,

45, res., 100KQ

res., 68KQ,

res. , 2.2MQ, l('NI, : 5% (red, red,

pot. , 750KQ

pot., 250KQ, audio, dual
res., 150KQ,

res., I. 8KQ,

pot. ,

res", 100KQ,

, 68, 69

res., 3. 3KQ, l(~, %10% (orange,

res., 470KQ,

res. , 1.8KQ, l(~, : 5% (brown,

50, 51" res. , 330KQ, 1/~,

res., 1650,

res., 22KQ, 1/~, % 5% (red

res., 22KQ,

res., 4. 7KQ,~,

res., 3500,

res., 6. 8KQ, 1/~, :10%

switch, Input Selector

switch, Function Selector

switch, slide,

switch, slide, SPOT 81145

transformer, power 81146

transformer, output 81154

terminal board, 5 screw 81903

terminal strip, lP right w/ground 89207

terminal strip, 3P 2 left 89219

13, terminal strip, 2 past

terminal strip, 3P 2 right 97710

25mfd, 200V

elec., lOmfd

, 25mfd, 6V

elec.

disc., 850mmf, "'10%

disc., . 0027mfd, "'10%

disc., 6oommf, "'10%

disc.

02mfd, "'10%

lmfd,

disc., . 0012mfd, "'10% (1.

disc., 225mmf

, elec., 4O-40-

1/~, "'10% (brown,

1/~, "'10% (brown,

1/~, '" 5%

1/'NI, "'lOOk.

7KQ,

1/~, :10% (yellow,

1/'NI

1/'NI,

1/'NI,

linear, dual

1/~, :10% (brown,green,yellow,

1/~, :10%

500KQ, linear

l(ZW,

1/~, :10% (yellaw,

lW, %10"k.

lOW, :10%

DPDT 81144

terminal strip, 4 past 66316

, 6V

"'10%

400V,

, "'10%

20mfd/350- 350-

4O0V

, 600V

03mfd

"'10%

(red, black, yellow, gold) 42029

(red, red,

5% (white, black, orange, gold)

'" 5% (brown,

:10% (blue, grey, orange, silver) 46006

(brown, grey, red, silver)

, concentric 53017

, concentric

%10%

:10% (arange,

!)N, % 5%

(red, red orange,

:10% (yellow,

OOOmmf)

(2. 7K or 2700mmf)

(20K or 20,

000mmf)

2Kor 1200mmf)

400V

(10K or 10,000mmf) 41000

black,green,

black, orange,

red silver)

vi~let

silver)

silver)

red, silver)

black,yellow,gold)

green, gold)

silver)

w/SPST switch 53018

(brown, black, yellow, silver)

, red, orange, gold)

(blue, grey, red, silver)

red, silver) 58004

orange,

violet,yellow,

grey, red, gald) 58302

arOnge, ye

violet,

silver)

ilow, sHver) 58408

silver)

silver)

red,

Stock'

~1\T

54000
90034
90033

90039

90038
97800 XFl

97712 XII

97027 XV1,

...97025

40000

40001

40007

40008

40016
40026

40027

41003
41016

41026

41027

41028

41045
41046

41047

42000

42002

42007
42008

42032
43000

43001

43004
46000

50012

50019

50021

51006
53016

57000

58300

58410
58412

58501

80057
81109
81110

81111

81116

81124

81134

89208

97300

66067

TB15,

TB17

Vl,

V7, 8, 9,

Vll,

2, 3,

XV5, 6, 7, 8,

10,

Description

18

'4-40

32 x 1/4
32 x 3/8

32 x 1

32 brown

ground

2 past right

lP left

bracket

terminal strip,
terminal strip,

tube, 12AX7

tube, 12AU7

tube, EL84

tube, EZ81

fusebolder
pilot assembly

sacket, 9 pin min. w/shield

socket, 9 pin min.

nut, hex, '6-

nut, hex, '3/8-

nut, he",

nut, he", '8-32

nut, for fuse holder

nut, lin., '8-

nut, tin., angle

screw, '6-

screw, '8­screw, '4-40 x 1/4

screw, '4-40 x 1/4 brass

screw, '4 wood

screw, '8-

screw, '6 P. K. brown

screw, '8-

screw, '8 P. K.

washer, '3/8 lock

washer, '6 lock

~sher, '4 lock

washer, '8 lock

washer, rubber, forfuseholder

washer, fiAt, '8

lug, '6 ground

lug, '3/8 pot ground

lug,

grommet, 3/8

feet, rubber

insulator for 50011

insulator for 50018
insulator for 50020

pbono plug

knob, outer concentric

knob, inner concentric

knob, duell concentric

line cord

wire, hook...p, thin wall

spoghetti

spaghetti, heavy

cable, 1 conductor
cable, 4 conductor
cable, 3 conductor

wire, bare

panel

bottom plale

brocket, left

bracket, right

bezel

chassis

shield w/spade bolls

perfomled screen

bracket~ Input

bracket far DPDT switch

shield bottom

clamp, wire

label, rear apron

label, tube layout

label, service

tube shield

Jewel, red

manual af instructions (wired)

manual of instructions (kit)

length
length

length

length

length

length
length

';'

';'

----

JI4

(g)

R59

C31

JI5

R58

C32

C18

R32

R42

VllVI2

R63

R62

R61

'IV

R60

..1f37C ..1f378 .1f37A ..1f38

1958

PREAMP

:10%

%10%

%10%

I/2N,

8KQ, I/2W, :10%

2AX7

';'

--

R71

4"5

pat., 1O0Q

res., 330KQ, 1/2W,

R66

R65 res., 330KQ, I/2W,

5ym Description

%10% R64

%10%

%IO"k

I/2W,

Description

R39 res" 470KD.

R..uJ res., lOKn, J(2W,

R4l res., 10KQ, I/2W,

%10%

% 5%

I/2N,

, 9OKD.

Descri tion

res., 4.7KD. I/2N,

res.

res., 9OKD. J(2W, % 5%

RJ4

RJ5

R16

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

res., IOOKQ, I/2W, :10%

res., 1O0KQ,

switch, function selector

switch, slide, DPDT

R67

R70 res., 6,

R71 res. , 6.8KQ, 1/2N, :10%

-51 switch, input selector

:10%

: 5%

% 5%

% 5%

8KD.I/2W, %5% R68

res., 1, 8Kn, I/2W,

R42

R43 res., 1.

I/2N, % 5%

res., lOOKQ,

res., 100KQ,I/2W, % 5%

R17

RJ8

:10%

I/2N,

, 330KQ, I/2W,

, 100KQ, I/2W, : 5% R69

res.

res., lOOKD. I/2W,

R45 res., 100KQ,

R46 res., 100KD. I/2W,

R47

R48 res.

R44

:5%

:10%

J(2N,

2MQ,J(2W,

, 750KQ linear, dual

res., 68KQ, I(2W, :10%

res.,

res., 68KQ,

pot.

pot., 750KQ linear, dual

R19

R20

R2l

R23

;:.oR22

res., 330KD. I/2W,

R49

pat., 250KQ, audio, dual

R24

tube, 12AX7

switch, 5P5T, port of R32,

:10%

R50 res., 33OKQ, 1(2W,

pat., 250KQ, audio, dual

--rt25

tube, 12AU7

tube, 12AX7

tube, I

tube, ELM

--VI tube, 12AX7

.V5

... V3 tube, 12AU7

""V7

-55 switch, slide, 5PDT

"'10%

, 330KD.J(2W, "'10%

R51 res.

R52 res., 1OKD. J(2W,

%10%

res., 150KQ,I/2N,

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

R26

R27

"-...V6

:10%

%10"k

%10%

I/'M, % 5%

!NI, 5%.

!NI,

I/2N,

, lOKn, I/2W,

res.

res. , 165Q,

res., 165Q,

res. , 22KQ,

R53 res., lOKQ,

R54 res., 10KD. I/2W,

R55

R58

-R56

- R57

%10%

, concentric

, concentric

linear, concentric

I/2N,

500KD.

, IMQ, linear, concentric

res., 8KD.I/2N, "'10%

res., I. 8KQ,

pot.

pat., lMQ, linear

pat.

pot., 500KQ, linear

R28

R29

R31

R32

R33

--R30

tube, ELM

tube, ELM

tube, ELM

tube, EZ81

tube, EZ8J

-VIO

-V9

-V8

....VII

.......VI2

I('M, % 5%

I/2W, :10%

I/'M, :10%

res. , 22Kn,

res., 22KQ, IW, :10%

res., 7KD.

R59

R60 res., 68KQ,

R61

R62

=-R63 res., 350Q, lOW, %10%

"'10%

"'10%

%JO%

"'lO"k

"'IO%

I/2N

I/2N,

I/2N,

3Kn, I/2W,

, lOOKD.

res., lOOKD.

res.

res., 3.

res., 3. 3KQ

res_, 470KQ, I/'M,

R34

R35

R36

R37

R38

STEREO AMP.

WATT HI-

~~~

, .

';' ';'

, .

, .

C13

channel 2

aux A -

DescriJ'tion

%JO%

Description

cap.,disc., 225mmf

C27

200V "'-

Description

cap.,paper, . 25mfd

cap.,paper, . 25mfd

channel I

channel 2

channel I

DUX B -

multiplex

mic -

phono - channel I

tope -

d'l

"JI0

%IO%

25V

25V

%10%

%10%

disc., 225mmf,

elec., 50mfd

cap.,

cap.,

cap.,elec., 50mfd,

cap.,disc., 47mmf,

cap., disc., 47mmf,

C28

C29

"'C31

;;,-C32

,.-C30

200V ~

6V

6V

6V

10mfd 6V -

cap., elec.,

cop., elec., IOmfd,

cap., elec., 25mfd

cap., elec., 25mfd

channel 2

channel 2

mic - channel.

phono -

tope -

tope output - channel 2

tope output - channel I

ac pawer

JI3

:)15

"JI2

,-:Ill

025mfd, GMV

disc., .

cap.,

,C33

025mfd GMV

cap., disc., .

-116

..J14

350-400V

GMV

GMV

..uJOV

025mfd,

025mfd,

025mfd, GMV

elec. , 30mfd,

cap., disc., .

cap., disc., .

cap., disc., .

cap.,elec., 40-40-20mfc!/350-

cap.,

C34

C36

""C35

%10% ;"C37

%1O% ...C38

%10%

%10% .

O25mfd, GMV -

0027mfd

850mmf,

, . 0027mfd,

cap., disc., .

cap., disc., 850mmf,

cap., disc.,

cap.,disc.

cap., disc., .

% 5%

%10%

%10%

%JO%

%10%

I/2N,

I/2N,

I/2N,

I/2N,

res., JMQ,

res., IMQ.

res., 1OKD.

res., 10KD.

res., 200KD. I/2N,

%1O%

OOOY

4OQV

03mfd

0012mfd

, . 00 12 mfd, %10%

, 47mmf, %JO%

elec., 3Qmfd,

molded, .

cap.,

cap.,

cap., disc.

cap., disc.

cap., disc.

-C41

"..,c42

......c39

.....,('C..uJ

..uJOV, %IO%-C43

%10%

%10%

%10%

02mfd

02mfd,

600mmf, %10%

molded, . Imfd,

cap., disc.,

cap., disc., 600mmf

cap., disc.

cap., disc., .

cap.,

%10%

% 5%

% 5%

%10%

%10%

I/2N,

I/2N,

I/2N;

2Kn, J(2N, %10%

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

res.,

res., 2.2KD.I/2N,

res., IMQ,

res., JMQ,

res., 200KQ,

res., 200KD. I/2N,

res. 7KD.I/2N, %JO%

RJO

RlI

R12

RI3

025mfd, GMV

OJ mfd,%l0%

0Imfd %10%

O25mfd, GMV

channel I

disc., .

cap.,

cap.,disc., .

"C46

channel I

aux A -

aux B -

cap. , disc.. .

-Jl

-:13

, 47mmf, %10%

cap.,disc.

disc., .

cap.,

.?C45

%1O%-C47

%10%

..uJOV, %IQ%- C44

..uJOV,

..uJOV, %1O%-"'C48

%10% _

%10% '

%10%

1 mfd,

00J2mfd, %IO"k

OOJ2mfd

, . I mfd,

molded, . Imfd,

disc., .

cap.

cap.,

disc.

cap.,

disc. , 225mmf

cap., molded

cap., molded, .

cop., disc. , 150mmf

cap., disc., 150mmf,

cap.,

DUAL 14

MODEL Hf-

~'4

%10% -

disc., 225mmf

cap.,

",,-,

';'

Jl0

J13

J12

Jl1

... Cl

-c4

....c6

~C8

.... C7

=CIO

- ClI

-c13

..:.CJ2

-CJ5

........C14

-'J6

,...CJ7

-CJ8

--C19

--C20

.....C21

-C23

-C22

""C25

~C24

""1:26

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anlOA a6uolj::J

lj::Jnw oct

snop

-IOS 6u!aq tU!o! aljt puo tJod aljt

uaaM,Jaq peal aljt Plolj

tJod 0 Ot

asol::J

6upap

TB19

XV10

XV9

TB 14

TB18

TB5

TB13

TB17

TB4

TB1

TB2

XV8

-Jl11213

.J8910

TB3

XV6

Fig. 1

'-'. ) !'

8 '

-$- -$-

TB20

TB21

XV12 -

XVll

TBll

to.)

lock-

U,e two

tighten

C39, as

, line

, TB6;

1eft with

, TB21.

, TB13;

j,

~g.

rubber washer

TB3. Under the re-

shown. Use

chassis. DO NOT

32 hex nuts. Under the

hole next to the fuse-

shown. Use two #6-

wider part of the holder. Slide the

32 hex nuts.

lug.

wew te,mlnall"""d, TB2, '" ,hawn.

the 5

right with ground terminal strip,

rubber grommet into the 3/8"

Mount the fuseholder, XFI, as

1. Mo,nt

Fig. 1.

nut, mount a #6 ground

, mount one post

hlg.

#6-31 screws, two #6 lockwashers and two #6-

9.

washer

10.

maining "

large nut over the fuseholder on the inside of the

against the outside of the chassis under the

11. Fig. 1. Push a

nut.

1. Mount the convenience outlet, J16, as

12.

holder.

screws, (two #6 lockwasher and two #6-

32 hex nut. Note

32 hex nut. Note

as shown. Use one

potentiometer and the

, PM,

will eventually be soldered to

When tightening potentiometer

mfd, 400 V electrolytic capacitor, C38, as

30mfd, 4O0V electrolytic capacitor,

(It is the reverse of C38 in step 13 above.

32 screw, one #610ckwasher and one #6-

Fig. 1. Mount the 30

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

th

13.

shown. Use one #6-

14. Fig. 1. Mount the

direction/of positive side.

direction of positive side.

shown. Use one #6-

3/8 hex nut. Between the

hum bucking potentiometer

Je one 3/8 pot ~rounding lug.

Fig. 1. Mount

(I)

15.

3/8" lockwasher and one

chassis, u

this terminal.

up the lu~ with terminal 2. The grounding lug

one post left

32 screw, one

The terminal strips

, TB5; two post

, TB12; two post

right, TB 18;

, TB9; one post6

, two left

, two

, TB20, and two post right

40 hex nuts.

ide switch, S5, as shown.

G" with one #6-

32 hex nut on each.

17; three post

right, TBIl; four post

single pole 2 position sl

, two

, 188; three post, two right

Mount the following terminal strips as shown. Use one #6-

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

one #6 lockwasher and one #6-

;J;/)

16. (\4 Fig. 1.

scre

ground)' TBI0; three post

to be mounted in this manner are: three post

two post, TB7; two post

four pos~, 1814; one post left, TB

)' F" 1. Mount the

17. (,

with ground; TB19; on~ post right with ground

18. ( Fig. 1. Mount the #6 ground lug "

Use two \4.-

#6 10cKwasher and one #6-32 hex nut. Note position of lug on figure 6.

Fig. 6 in the fol-

symbol number of

part with a crayon

The wiring which comes later

such matters as orientation of

ASSEMBLY

mounting each part, the

it will be required to refer to

bottom of the chassis next to the

BELOW CHASSIS

In addition to Fig. 1,

soft pencil.

lowing mounting procedure in order to settle

terminal boards, keyways on tube sockets, etc.

Note:

will be greatly facilitated if, after

the part is written on the

shown. Use

40 hex nuts. Note the

case)' note the mounting

10 as shown.

32Iiex nuts. Mount

input jack strip. (Fig. 10).

two 14-40 screws, two #4 lock-

mount 9 pin miniature sockets, XVII,

chassis and the

pin miniature tube socket, XV12, as

lockwashers, and two #4-

3 terminal input jack strip, J8, 9,

XV9 and X\f10. Use

40 hex nuts on each. In each

1.. Similar to the above,

between the

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

, XV7, XV8,

Fig. 1. Mount the 9

40 screws, two #4

v(

two #4-

Fig.

Fig. 1. Mount the

j9 direction in figure 6.

(J)

mounti

2. (/)

XV5, XV6

washers, and two #4-

3.

direction in figure 6.

Use four #6-

the 3 hole insulator

mounted

lockwashers

13, as shown.

il6

between the chassis

32 screws, two

four '6- 32 screws, four #6 lock-

40 screws, two #4 lockwashers and two

10 Use

terminal input jack strip, JIl)' 12,

10)

shown. Use two #6-

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

32 hex nuts. Mount a 3 hole insulator

switch bracket with the switch (previously

16-

1. Mount

Fig. 1. Mount the 3

Note mounting direction in figure

and the input Jack strip. (Fig.

washers and four

4. (J,

#4-40 hex nuts.

5. . ('~i9'

switch bracket, as shown. Use two #4-

32 hex nuts.

in step 5) on the chassis, as

6. (~ig. 1. Mount the

and tWo #6-

QS shown.

Use two

32 hex nuts.. Mount a

TB4.

32 hex nuts. Under one of the

1. Mount the 5 screw terminal board, TBl, as shown.

J) Fig.

#6-32 screws, two #6 lockwashers and two #6-

7. (~) Fig. 1. Mount the2 terminal tape output jack strip, J14, 15,

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

2 hole insulator between the chassis and the jack strip.

lockwashers, mount one post right terminal strip,

8. (

R15

ell

R21

Fig. 2

Thus

is shown

has been assigned a

000mmf) disc capaci-

shown in the figure. Each

the switch as shown in the draw-

position of the lugs referred to are

a letter. Each lug

1, the "D" side of the wafer (rear side of

7 (S 1). Connect C46 from S IH-7 (C) to

1 B-

two. 025mfd(25Kor 25,

counter-clockwise position. The switch

. Cover each lead with a 1/2" piece of spaghetti.

6 (C) to S

fromS 1 G-2(C)

3 (C) to SlB-l (C).

from SlB-

l (C). Connect CI0

850mmf disc capacitors, C9 and C10, to

. Connect R15

2 (C) to SlG-4 (C).

l (C). Connect

, red, green, gold) 5% resistors,

R21 from SlB- l (C) to S lC-

two 2. 2MQ (red

2 (C).

2 (S2)

spaghetti.

mmf) disc capaci-

C12 from SlF-

l (S2). Connect

two. 0027mfd (2. 7Kor 2700

12 (C) to SlC-12 (C).

12 (S2). Connect C44 from

. Connect R17 from SlB-

1 B- 12 (S2) to S lC-

, Cover each lead with a 1/4" piece of

l (C) to SlG-l (C).

4 (C). Connect C14 from

frcm SlB-4 (Sl) to SlC-

ferred to by the wafer number and lug designation.

S IB-

PREWIRING OF SELECTOR SWITCH

3 refers to selector switch S

('

in the figure from the rear view. The exact

Turn the switch to its maximum

determined by looking at the switch from the view

lug lD-

side of the wafer has been assigned

num er. The lug is re

the econd wafer-side facing you when holding

Fig. 2. Cut all leads on

1. 4)

ing) and 3 refers to the lug on this particular side of the wafer.

/S 1).

S 1 ~

tors, C45 and C46, to 3/4"

Connect C45 from

R16, to 1/2"

2 (C) to SlG-

, to 1/2" . Connect

Fig. 2. Cut all leads on

ftm SlF-

/J)

3. (d.Fig. 2. Cut all leads on two

3/4". Connect C9 fromS1B-3 (S2) to SlB-

2. ()) Fig. 2. Cut all leads on two 90KQ (white, black, orange, gold) 5%

resistors, R15 and

Conne R16 from SlG-

to S 1/-4 (S2).

R67

R21 and R67

4.

tors, Cll and C12, to 1/2"

5. (~ Fig. 2. Cut all leads on

Cut all leads on two 100KQ (brown, black, yellow, gold)

G- (S4).

6. (' Fig. 2.

to S 1

conne t 111 from SlB- l (54) to SlC-

resistors)' R17 and R18, to 1/2"

Cut all leads on two 47mmf disc capacitors, C43 and C44,

2. Cut all leads on two 600mmf disc capacitors, C13 and C14,

to S 1 G-1 (S2).

Connect C43 from S

Fig. 2.

:Sf)

S 1 F-

7.

Connect;R18 from SlF-

to 3/)ft.

5 (Sl) to SlF-5 (C).

SlG-

to 3/4" . Connect C13

8. ( /Fi9.

ll (C).

and red leads to

1), the red lead to

back 1/4" from this end of

1 H- l1 (S2).

11 (S 1).

5 (Sl).

conductor shielded

7(S1).

8 (SI).

back the inner insulation

On the

. This

12 (S 1).

3 (Sl)

the two leads

4 (Sl). Twist

3 (S 1)

S 1 E-

5 (S2). Twist the two

green wire to S 1C-2 (S 1)

. ~

/)

piece of grey wire to S 18-

. Twist the shield strands together

pieceofbrownwiretoS1D-

connected until later.

3" piece of brown wire to SlF-

a 2" piece of black wire to S

7(S2)and the shield strands toS1H-

. Strip the insulation

conductors. This end of the cable does not

shield strands together. Strip back the insulation 1/4"

I later.

- Connect one end of a 2 1/2"

2. Connect one end of

. Twht the

Fig. 2.

rg.

td

16. ~.

and cover with a 1" piece of thick spaghetti. Cut the orange

3/4" and the brown lead to 1"

SlH-9(S1), the brown lead to SlH-

On the other end of the same piece of shielded cable, strip the outer Insulation

each of these leads. Connect the orange lead to S IH-I0 (S

back 3/4"

from the end 9feuch of the inner

get conne~'d unti

1 1/4"

end of a 10"

17.

5 IA - 10 (52).

Strip back the inner insulation 1/4" and connect to S18-

; Twist the shield strands together. Strip

2. Connect one end of a

fig. 2. Connectoneendofa5"

(v)

19.

'Fig.

20. (

shield

. Jhis end of the cable does not get

18. V) Fig. 2. On one end of a 4 1/2" piece of single

cable, strip the outer insulating back 1/2"

and cut off:

1/4"

On the other end of the same piece of shielded cable, strip back the outer in-

sulation3/4"

single conductor shielded cable,

strip the outer insulation back 3/4"

. Twist the shield strands together and cut

Strip back the inner insulation 1/4"

one end of a 5" piece of grey wire to SlD-

Connect one end of a 3" piece of grey wire to S 1 G-

2. Connect

Fig. 2. On one of a 4" piece of

Fig. 2.

I,

21. (

strip the outer insulated back 1/2"

off. Strip back the inner insulation 1/4" and connect to SlG-6(Sl).

Twist the shield strands together.

other end of the same piece of cable,

inner

later.

22. (

end of t~e cable does not get connected until later.

each

23. (~/Fig.

6 (C).

a 5 1/2" piece of brown wire to

piece of blue wire to S lC-4 (S2). Twist the two

ether.

v) Fig. 2. Connect one end of a 4 1/2" piece of

and one end of a 5" piece of yellow wire to SlE-

together. .

24. (

and one end of a 4 1/2"

vfFi9. 2. Connect one end of

leads tog/

6 (S2) to

leads together.

25 (

and one end of a 5 1/2" piece of white wire to SlF-

brown lead to

back the insulation 1/4"

the shield strands together and

. Strip

. Twist the shield strands together.

insulation 1 1/2" from one

Connect the brown lead to SlB-6 (S2),

strands together and

1 3/4" from one end of a l0"

brown lead to SlD-

brown, red and orange

Connect the

1 1/4" Strip back the insulation

10 (C). On the other end of the same piece of shielded

1 B-8 (S 1), the orange lead to S 18-9 (S 1) and the twisted

2. Connect one end of 0 3 1/2" piece of block wi 'e to

k the in,ulaHon 1/4" fwm the end af each af the inne, conduct"".

Fig. 2. Strip back the outer

9. J)

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

the red lead to 3/4" and the orange lead to I"

the red lead to S

from the end of each of these leads.

piece of 3 conductor shielded cable. Twist

shield strands to S lA-

of the cable does not get connected unti I later.

cable, strip the outer insulation back 3/4"

Strip

This en

Fig. 2. Strip back the outer insulation

iJ IF; g.

11. (

10.

piece of the4 conductor shielded cable. Twist the shield

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

leads to 3/4" each and the yellow lead to

cover with a 1 1/2" piece of thick spaghetti Cut the

10(S1)and the yello

back 1 1/4". Twist the

one end of a 9 1/2"

6 (C). On the other end of the

of bare wire from S ID-l1 (S2) to S 1 E-

, and yellow leads to 1". Cut the

9(Sl), the orange lead toSlD-

Connect a 1" piece

the twisted shield strands' to S lC-

the red lead toS1D-

(SI),

lead- to S 10- 11 (C).

(S 1). Connect

shield strands. Cut the red, orange

strands to 3/4". Strip back the insu lation 1/4" from the end of each of the

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

Strip back the insulation 1 3/4" from

Fig. 2.

N.)

12.

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

strands together and cover

brown and red leads to 3/4"

S 1 F- 12 (S 1), the red lead to S 1 F-l 0

back the insulatIon 1/4" from the end of

. Strip

shield strands, red lead and

. Strip back the insulation 1/4"

of a 4 1/2" piece of black wire to SlF-6(C).

1 1/2" piece of bare wire from SlC-

2. Connect a

Twist the shield strands together,

insulation 1 1/4" from one end of a

. Twist the shield strands. Cut the

?d of each of the inner conductors. This end of the cable does not

, /i

V I

Fig. 2. Strip back the outer

(V)\.Fi

13. ~~F!~ 2. Connect one end

(Sl), the brown lead to SlF-9(Sl) and the twisted shield strands to SlF-

and the orange lead to 1"

piece of 3 conductor shield cable. Twist the shield

wIth a 1 1/2" piece of thick spaghetti. Cut the

On the other end of the same piece of shielded cable, strip the outer insulation

of these leads. Connect the orange lead to

back 1 1/4"

from f~e e

get co~neqted until later.

oran~e lead to 3/4" and the brown lead to 1"

14

S 1 F-6 (Si3)

15. (,)

7 1/2" piece of 3 conductor shield cable.

=$=

I '

J567

J1234

XV2

XV1

XV4

(37

TBI5

Fig.

(ii) J)

CJI ~

TB16

XIl

R32

R33

R30

R31

R23

R22

XV3

R24

R25

; both

Push

yellow

32 hex nut.

yellow lead to 3"

32 screws, one #S lock-

mounted in step 11.

; both yellow leads to 3 1/2"

, T2, cut the black, brown, green,

. Mount the power transformer as shown.

. Cut the blue, red and brown-

tighten,..

yellow, red

under the cable clamp

yellow leads through hole

. Cut the blue and brown-

Y" under the cable clamp before

blue and brown-

transformer, T3, cut the orange,

mount the cable clamp. On

. Use four #S-32 screws, three

chassis.

shown in figure S. Tighten all nuts except

32 hex nuts. Under two of the lockwashers, mount

after the

4, as shown.

assembly, XI1.

C37, as shown. In

turn. DO NOT twist

32 screw, one #6 lock-

chassis apron.

shown. Use two #6-32 screws,

moon, square and triangle near lugs to

terminal input strip, J 1,

32 hex nuts. Follow arrows to mounting holes.

somewhat less than a quarter

Use

, as shown.

, 7

32 hex nuts. Use a

hand corner of the front

32 hex nuts. Use a three

, one HSlockwasherand one #S-32 hex nut.

input strip and the input bracket.

Z" nearest the power transformer

transformer as shown. Push the red, blue and brown-

Use three #8 lockwashers and three #S-32 hex nuts on three of the

Fig. 3. On the output transformer

(V)

11. (\.fi Fig. 3. On the power transformer, 11, cut both green leads, the red-

Position so that the green and yellow leads face the center of the chassis (see

yellow lead and the white lead to 2 1/2"

figure 6).

red leads and both black leads to 5 1/2"

screws. On the fourth screw, use one #S grounding lug and one #S-

support,

12.

cketwith

leads through hole "

Mount the output

orange and yellow lead to 4"

leads from hole "

SI ide all

the other leads through the hole " . Use four #S-

hex nut.

washer, two #S ground lugs, and one cable clamp. Secure each with a #S-

40 screws,

. Cut the brown lead to 5"

. Push the red,

7'Fig. 8.

. Push the other leads through hole "

ing. Se

13. Fig. 3. On output

and green leads to 6"

#S lockwashers and four #S-

yellow leads to 4"

Under the nut without the lockwasher,

the shield.

IJ two post right

Use one 3/Slock-

control potentiometer, R30,

40 screws, two #4 lockwashers,

40 hex nuts on each. Note mounting

mount the 9pin miniature tube so

Use two #4-

from the top of the chassis. Use two #4-

the 9 pin miniature tube socket with shield

chassis. Use two #4-

40 hex nuts. Note mounting direction in figure

to the above, mount the 9 pin miniature tube socket

S4, as shown. Slide the locating lug on the poten-

Mount the electrolytic can capacitor,

32 hex nut. Tighten the mounting screw and nut

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

Fig. 3.

Fig. 3. Mount the input bracket as

9~f has been lined up with the hole in the front

(u.y

the top of the chassis, mount a cable clamp under one of the screw heads. Do

not tighten this screw yet. Run all leads from hole "

3/8 hex nut.

3/S lockwasher and one

14.

under the chassi~ in the direction

the one h91ding the clamp on the top side of the

R24, R25,

chassis and twist the tabs

determine direction of mounting. Insert the mounting tabs into the slots in the

figure 6. note the direction of the half

3/S hex nut.

focus control potentiometer, R22, R23

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

the tabs e?,cessively or they will shear off. Solder the tab without a hole to

3/SIockwasher and

Screw the assembly to the chassis as shown using one #6-

the cha~r.is at its slot.

ide the

(\V

17. (\ )/Fig. 3. Mount the four

16.

pilot li

washer an~ one #6-

switch, Sl, as shown. Slide the

Use fdJr #6-

two #6 lockwashers and two #6-

four hole il'1sulator between the

TB 16, as shown. Use one

32 hex nut.

IS. ( 1/Fig. 3. Mount the three terminal input strip, J5,

hex nut.

mounting hole. Use one

Use one

Use one 3/8 lockwasher and one

3/8

remove the fuseholder mounted in step 10, on

19. (\ ) Fig. 3. Mount the cable clamp on the upper left

apron~ s shown. Use one #8-32 screw

hole in U ator between the input strip and the input bracket.

four #6-31 screws, four #6 lockwasher and four #6-

, tighten the nut but do

This time

Next, continue with step 120n this

this. page (page 7C), remount the fuse-

page 3C.

normal sequence of steps.

step lIon

~g.

(\y

TOP OF CHASSIS ASSEMBLY

3. Mount

1. (

XV2, from the top of the chassis.

, XVl and XV3,

#4 lockwashers and two #4-

3. Similar to the above,

\ ~ Jig.

2. (

and two #4-40 hex nuts. . Note mounting direction In figure 6.

direction~igure 6.

shielet--- support

screws, two~

the lockwashers, under the chassis, mount

Mount the dual concentric treble control potentiometer with

two #4 lockwashers and two #4-

3. (" Fig. 3. Similar

with shield support, XV4, from the top of the

termi":~1 strip, TB 15.

6. Un~erone of

4. ('1 Fig. 3.

on-off switch, R32, R33,

Mount the dual concentric bass

tiometer into the small hole adj acent to the mounting hole.

R31 , as shown. Slide the locating lug on the potentiometer into the small hole

5. (01 Fig. 3.

adjacent to the mounting hole.

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

(stock# JS04S)

jacent to the mounting hole.

6. (L.) Fig. 3. Mount the dual 250KQ level control potentiometer,

as shown. Slide the locating lug on the potentiometer into the small hole ad-

Mount the input selector

Fig. 3. Mount the dual 750KQ

(stock# )SO46)

7.

ig. 3. Mount the function selector switch, S2, as shown. SI

into the small hole adjacent to the

8. (

one 3 ~ex nut (stock# 18045).

Fig. 3.

locati g lug on the switch into the small hole adjacent to the mounting hole.

Use one 3/S lockwasher and one

9. ( )

10. (\ .) Fig. 3. Mount the two post terminal strip,

locating lug on the switch into the small hole adjacent to the mounting hole.

Use one 3/S 10ckwClsher and one 3/8 hex nut.

Before the next step,

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

NOTE:

page 3C. After completing

holder as indicated in step 10 on

page (page 7C), and follow the

not tighten too much or holder will crack.

Fig. 4

R33

R32

10\

0 0

ffi

eOe

eOe

Top Shield

eOe

eOe

~ICJ~

iii

eOe

0 eOe

2 (C) to S2B-3 (S 1) and

S(S2) and the grey

7 (S 1) to

1 (Sl).

2(Sl)to R25-

1 (S1)

5(Sl) to R24-4 (Sl).

leads

clamp, as

S (C).

7(Sl) toR32-

4(S2).

10 (S 1) to S2B-

~.

from S2B-

(from the twisted yellow and grey

3 respectively) to S2A-

9 (S 1) to S2A-S (C).

. Connect one resistor

, to 1/2"

' Fig. 4. Cut all leads on two 6. SKQ (blue, grey, red, silver) resistors,

S. '(v)

R70 and R71

Fig. 4. Connect the yellow lead

the second resistor from S2B-

leads originating at SlE-4 and SlD-

9. ( )

and the

chassis. Run

remaining loose leads from input selector switch,

2 (S2).

all the

Fig. 4. Connect a 2" pieceofgreywirefromS2B-4(C)toR22-4(Sl).

lead from)he pair to S2B-

Jl, 2, 3,

Sl through the rectangular hole below the switch.

10. (l(Fig. 4. Push

5 (Sl)

11. (\)/

6 (S2) to

7 (Sl)

V" to the bottom of the chassis.

of grey wirefromR22-

piece ofbarewirefromR33-

front of the chassis and under the cable

Connect a 3" piece of yellow wire from R23-

4. Connect a 3" piece

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

3 (S 1).

12. (

R23-

13. (\) fig. 4.

4 (S2) to

Fig. 4. Connect one end of a 17" piece of yellow wire to XI1-

and one end of a 16" piece of brown wire to XI1-2 (S 1). Twist the two

14. (J),Fig.

together. Run along the

15. (\/)

4. Connect a l"

16. (

shown. Push'unsoldered end through hole "

Uti

4. Connect a 2" piece of grey wire fromS2B-

pther end through hole "

17. (0 Fig. 4. Connect one end of a 4 1/2" piece of black wire to R32-S (S2).

Push the

lS. (0Fig.

connected as

6, 7-5 (Sl)

('\)/

()

~/

1 F along the top of the

connected as follows:

mounted on the output transformer, T3, and tighten

TOP OF CHASSIS WIRING

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

(v)

1.

three conductor cable from switch wafer, S

; The four leads from the cable are

6 (C).

these under the cable clamp

this screw. Connect the outer shield from the four conductor cable to

yellow to Jl, 2, 3,

CY orange to Jl, 2, 3,

of black wire from J 1

1 (Sl)

3 (Sl)

Connect a 1" piece

to J1, 2,

brown to Jl,

(if

(\:) red

("') Fig. 4.

2.

black wire from Jl, 2, 3,

Connect a 1" piece of

4;"2 (Sl).

2, 3

3. () Fig. 4.

J 1, 4 (C).

Push leads tt,rough hole

leads (originating at S

6range to J5,

1 (S 1).

, 6, 7-

outer shield from the three conductor cable from

2 (S 1)

S" in the front panel between the

ide switch)' S3.

switches and behind the slide

chassis as shown.

4 (C) to J5

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

to J5, 6, 7-3 (S 1)

6, 7-

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

Fig. 4. Connect the

(,-1 brown to J5, 6

1 F to J5,

Push the twisted green and blue leads (originating at S lC-

4 respectively) through the hole "

Fig. 4.

lJ/red

Run the twisted white and brown

3 respectively) along the

,,) Fig. 4.

(V)

5.

4.

of spaghetti from J5, 6, 7-

follows:

wafer S

and S lC-

two rotary switches and behind the sl

6. tJf

S" in the front panel between the two rotary

and 51 E-

7. (\

switch, S3.

TB16

Fig. 5

R33

...

PCl

R32

2 (Sl).

2 (S2).

1 (S2).

TB 16-

3 (S2).

1 (S2).

chassis.

back 1/4-

V" to the bottom of

10 (S 1). Twist the two

circuit plate Pe 1 , has

concentric potentiometer, with the printed circuit

Referring to the set below the main drawing, wire the

mounted on the rear of the dual treble control potentiometers.

Fig. 5. Connect one end of a 10" piece of grey wire to the swi~ch

leads together and push the unsoldered end through hole "

S4-9 (S l)which is

6. (IA

the chassis.

Connect one end of a 14" piece of black wire to S4-

rear sectjon of the dual

The wiring of the front potentiometers and the printed

now been completed.

plate, !1t2, as follows:

111

connect to R32-

cut leads

on printed circuit plate PC2, to

116

1(C)and lead #lto R32-3(C).

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

1200mmf) disc capaci-

2 (S2).

1 1/2" piece of spaghetti and

Cut the leads #2 #3 and

the same printed circuit plate Pe2,

Fig. 5.

. On

1/2"

lead #5 to 1 1/4" and lead #4 to 1 3/4"

7.

#3 to R30-2 (C) and lead #2 to R30-1 (S 1). Cover leads #1 and #7 each with

Cover lead #4 with a

a 2" piece of spaghetti. Connect lead#7toR32-

Cover Ijbd #5 with a 1" piece of spaghetti and connect to TB 16-

. Connect from R30-3 (S2) to R30-

8. ('YFig. 5. Cut both leads on a . 0012mfd (1. 2K or

tor, C20, to 1/2"

and #7 to 2 1/4"

on one end of a 5"

strands together and

outer insulation back

Connect this end to R32-

U" to the bottom of the

T" to the bottom of the chassis.

U" to the bottom of the chassis.

back 1/4"

through hole "

same piece of cable, strip the

Strip the outer insulation back 1/2"

Connect one end of an 8" piece of grey wire to

1other end through hole "

(.1)- Fig. 5.

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

Push the/other end through hole "

9. (v) Fig. 5.

Push th

11.

cut off. Strip the inner insulation

piece of single conductor shielded cable. Twist the shield

Push this end of the cable

On the other end of the

3/4". Twist the shield strands together. Strip the inner insulation

, R31

One printed

R31 and R33 nearest

PC 1 is mounted and

the front potentiometers.

Pe2 gets connected to the

The rear potentiometer is

and simple, the first plate,

mounted on the rear of

connected to the potentiometers,

The other printed circuit plate,

PC 1 are not shown

ont potentiometer

is mounted and wired in the circuit

drawing, the fr

the connections made previously for

811

4 (C).

6 (C).

chassis.

using the upper

insulation back

the shield strands together and

, Connect this end to R33-

piece of brown wire to R33-

T" to the bottom of the

back 1/4"

using the first printed plate, PCl,

Strip the outer insulation back 1/2" on one end of a

Fig. 5. Connect one end of a 711

. Twist the shield strands together. Strip the inner insulation back 1/4"

6 (S2)

#3 and #6

112

spaghetti

1 1/2". Connect lead

, cut leads

with a 1 1/4" piece of

plate)' Pel

2 (C) and lead #2 to R31- 1 (S1). Cover leads

piece of spaghetti. Connect lead #1 to R33-

#5 and #7 to 2". Cutdead #4 to

111

. Cut leads

4 (S2). Cover lead #4

to R33-

3 (C), lead #3 to R31-

117

piece of spaghetti

1200mmf) disc capaci-

#5 with a 1 3/4"

. 0012mfd (1. 2K or

1 (C).

5 (Sl). Cover lead

green wire to TB 16-

2 (S2) to R31-3 (S2).

T" to the bottom of the chassis.

Fig. 5. Connect one end of a 5 1/2" piece of

Push the other end through hole "

...

is shown dotted in. All

circuit plate, PC 1 gets

the front apron.

Two printed circuit plates are soldered to the dual potentiometers.

To keep the drawings clear

potentiometers R30 and R32

Below this drawing, the second plate, PC2

wired in first, with the associated connections.

shown dotted in.

in this drawing to avoid confusion.

with its associated connections. In this

We now wire the circuit

1. ( Fig. 5.

drawing.

On the other end of the same piece of cable, strip the outer

cut off. Strip the inner insulation

piece of single conductor shielded cable. Twist

Push this end of the cable through hole "

Push the other end through ho I e liT II .

2. (\J

... 3/4"

*6 to R31-

to 1/2"

#1 and #7 each with a 1 3/4"

and lead

and connect to R33-

and conflect to TB 16-

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

3. (v) Fig. 5. On the printed circuit

(C)

5. (v)

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

TB13

XV2

TB17

XV9

TB 14

C:37

XV1

TB 12

J .

J1112.

, I

XV10 J8910

TB5

TB2

TB20

Fig. 6

T B'l5

TB 18

XV4

TB19

TB3

TB1

XV8

TB4

J 1415

TB9

TBll

XV6

TB21

TB8 XV3

-$-

J16

XI1

R64

XV7

XV5

XVll

;:; TB 10

TB6

TB7

LCD

XV12

4 (C)

4(C)

4 (S3)

5 (Sl).

5(C).

9 (S2)

4 (C)

5(S 1).

5(Sl).

5 (Sl).

other

-;-

/ /

(/

4(S2) to XV6-

5 (C).

5 (S2). Twist the wires and

5(C). Twist the wires and run

of yellow wire to XV9-

9 (C).

5 (S3). Twist the wires and

4 (S2) to XV2-

9 (S 1).

wire to XV9-

Connect the other end of the yellow wire to

end of the brown wire to XV6-

Fig. 6. Conne!=t one end of a 4" piece of yellow wire to XV9-

ojher

Connect the other end of the yellow wire to

piece of bare wire from XV6-

1/211

Connect a

Connect a 1/2" piece of bare wire from XV2-

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

" i

Connect one end of a 4 1/2" piece of

Fig. 6

(0

run along the chassIs as shown.

and one end of a 5" piece of brown wire to XVI0-

12. (\.....

XV9-4 (C) and the other end of the brown wire to XV9-

and one end of a 5" piece of brown wire toXV9-

along the chassis as shown. Connect the other end of the yellow wire to XV6-

and the

13.

and one end of a 7" piece of brown

run along t~e chassis as shown.

14. ()) Jig. 6.

15.

XV2-4 (YJ and the other end of the brown wire to XV2-

16. UJ Fig. 6

the wires and

4 (C)

4 (S2) to XVl-

brown wire to XV6-

9 (S2). Twist the wires

5 (S2). Twist

XV4-9(C).

Connect the other end of the brown wire

Connect the oth~r end of the yellow wire to

brown wire to XV4-

of the ye Ilow wi re to XVl-

piece of bare wire from XVl-

1/211

wire to XV12

4 (S3) to XV4-

Connect the other end of

wire from XV4

chassis as shown.

4 (C) and the other end of the remaining yellow

second 3 1/2" piece of yellow wire to XV12-

chassis as shown.

chassis as shown.

and one end of a 3" piece of yellow wire to XV6-

run along the

6. Connect one end of a 2 1/2" piece of yellow wire to XV4-

4 (C) and the other end of the brown wire to

~9.

17. (

XV4-

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

and run along the

Connect a

9 (S 1) and the other end

(~/i9' 6. Connect a 1/2" piece of bare

lS. (\)iFig. 6

to XVl-

20. ('1) Fig. 6. Connect one end of one 3 1/2" piece of yellow

4 (C) and one end of a

Twist the wires and run along the

one of the yellow wires toXVl1-

4 (S2) and the

twist the yellow leads and

From the power transformer, Tl,

5 (C).

wire to XV11-

5 (S2).

Fig. 6.

lead to XV11-

21. (\~

run along the chassis as shown. Connect one lead to XV11-

jy;g,

3 (C)

4 (C) arid the other end of

n, connect one g'oon leod to

3 (C).

2 (S1).

pot grounding lug over terminal #2 on R64. Solder

1(C). Twist the wireslogether.

one end of a 4" piece of yellow wire to R64-

BELOW CHASSIS WIRING

piece of brown wire to R64-

XV7-5 (C).

6. F'om the powe' t,on,ro,mer,

Fig. 6. Fold the

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

I.

R64-

2.

/Fi9. 6. Connect

this lug to this terminal R64-

3. (

j/wire to

and one endofa 4"

the broW

Connect t~e other end of the yellow wire to XV7-

(S3)

4 (C) and the other

brown wire to XV7-

l (S3). Twist the wires to-

9 (C).

4 (C) and the other

4 (S2). Twist the leads

the

5 (C).

4 (S3) to XV5-

wire to XV5-5 (S2)

9 (S3). Twist the two

9 (S1).

chassis as shown) to XV5-

brown and yellow wires from hole "

brown wire to XV5-

brown wire to R64-

(running along the

: piece of yellow wire to XV7-

Connect one end of a 5" piece of yellow wire to R64~

. 6. Connect one end of a 4 1/2" piece of

Connect the other end of the yellow wire to XV5-

('-/ Fig. 6.

4. ,

gether. Connect the other end of the yellow wire to XVS-

and one end of a 5" piece of

(\!) Fig.

together. ,

end of the brown wire to XVS-5 (C).

5.

end of the brown wire

.... (S2) ~nd one end of a 31

Connect the brown lead to XV5-9 (C) and

piece of bare wire from XV5-

4 (C).

and the other end of the brown wire to XV3-

Connect one end of a 4" piece of yellow

chassis as shown.

4(C)

Fig. 6. Run the twisted pair of

~I

6.

along the

yellow lepd to XV5-

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

S. (\)! Fig. 6.

toiX~3-

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

wires and run along the chassis as shown. Connect the other end of the yellow

wire

5 (S2)

~e to XVlO-4 (S2)

4 (C).

4 (S2). Twist the wires and

"om XV3-4 (52) to XV3-5 (5 I),

a 6" piece of brown wire to XVS-

,Connect the other end of the brown wire to

" one end of a 5" piece of yellow wi

chassis as shown.

6. Connect 0 1/2" p; ec. 01 b"'e w; ,.

Fig. 6. Connect one end of

iFf,.

10. (1

9. (

and one end of a 6" piece of yellow wire to XVS-

run along the

Fig. 6. Connect

9 (C) and the other end of the yellow wire to XVI0-

J)

XVI0-

11.

-$-

XV1O

R62

TB5

XV7

XV9

TB18

XV3

TB8

Fig. 7

-$-

Jl6

C38

XVll

3 (S 1).

9 (C).

1 (C).

9(S2).

9 (S2).

2 (C) to

3 (C) to

3 (C)

1 (S4).

1).

2 (C).

, silver) 2 watt

9 (Sl) to TB5-

9 (S2) to XV9-

1 (C) to XV11-

9(C) to XV9-

from XVI0-

of orange wire from XV7-

1 (C) to XVlO-

from TB5-

piece of orange wire from TB5-

, red

2 (S2).

1 (S3) to TB5-

piece of orange wire fromXVa-

leads on a 4. 7KQ (yellow, violet

Connect from TB5-

ConneCt a 4 1/2"

Connect a 3/4" piece of bare wire from TB6-

3/4"

i9 7. Cut both

YFig. 7. Connect a 6"

15. (trFig. 7.

16. (w) Fig. 7. Connect a 7" piece

17. (\,

18. (\.J Fig. 7. Connect a 3" piece of orange wire

19. (yYFig. 7. Connect a 1" pieceof bare wire

2 (C).

(1/1 Fig. 7.

20.

TB 18-

, R62, to

21. (~

resistor

1 (C).

1 (C) to TB8-

T" to XV3-2 (S

U" to TB8-

from XV8-

from XV10-

1 (C).

3 (C) to TB6-

U" to TB7-

of red wire from TB5-

yellow wire from hole "

the green wire from hole li

81/2" piece

Connect a 3 1/2" piece of yellow wire

Fig. 7.

22. ~/)

Connect a 3 1/2" piece of yellow wire

3 (C).

XV7-3 (C).

23. (\)lFig.

to XV9

Connect the black wire from hole "

7. Connect the

Fig. 7. Connect an

24. r)

Fig. 7. Connect

)' Fig. 7.

25. (....

26. (;) ,

27. (vi/Fig.

(V)

Fig. 7. Connect a 3 1/2" piece of black wire from TB7-

28.

the shield to

from one end of a 8"

. Connect

Connect the shield to

2 (Sl).

Twist the shield strands together.

. Twist the shield strands together.

insulation 3/4"

outer shield from the single conductor shielded

1 (C) and the inner conductor of the some cable

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

) to TB7-

Strip back the outer

Fig. 7. Connect the

29. (\J

cable (from hole "

2 JC).

to TB7-

Fig. 7.

('0.1

30.

1 (C) and the inner conduCtor to TB7-

Strip the insulation on the inner conductor back 1/4"

piece of single conductor shielded cable.

TB7-

1 (Sl) and the inner conductor to J14, 15-

cable, strip the outer insulation back 1/2"

Strip the insulation on the inner conductor back 1/4"

J14, 15-

/)

7(S2).

7(S2)

yellow and

7 (C) and the

1 (Sl)toXV11-

to XV12-

, Tl, connect the red-

, Tl, twist the two red leads and

1 (Sl)toXV12-

power transformer.

piece of bare wire fromXVl2-

a 1 "

From the power transformer

Fig. 7.

1.

Fig. 7. From the power transformer

(IJ)

2.

white I"ads to ground lug "A" (C) at the

run along the chassis as shown. Connect one red lead

-(Fig. 7. Connect 01" pieceofbarewirefromXVl1-

other red lead to XVll-7 (C).

3. ('

F,g. 7. Run the

) Fig. 7. Connect

(,i

4. ("

5.

1 (S2)

from hole "

l (C) and the black

, C40, to

transformer, Tl, to

the black lead (near-

careful not to burn the leads

03mfd molded capacitor

A" (S3). Be

twisted pair of grey and black leads

as shown. Connect the grey lead to XFl-

piece of spaghetti. Connect one lead to XF1-

3/4"

Cut both leads on a .

Fig. 7.

2 (C).

) to J16-

From the power transformer Tl, connect

Fig. 7. .

Connett remaining black lead on power

(S 1).

V)

lead to J16-:- 1 (C).

along the chassis

6 (

and coverE!och with a

and the other lead to ground lug "

running near ground lug "

7. (

est ground lug "

XF1-

1 (C)

XV12.

1 piece

, R63, from TB6-

3 (C) to

" B" (S 1) on

plece of spaghetti and connect

bare wire from XV12-

watt resistor

1 1/4"

30mfd electrolytic capacitor, C38, to

leads to , 1 1/4" and cover 'each with a 1'

negative lead to ground lug

Connect a 1/2" piece of

Fig. 7. Connect the 350Q, 10

2 (C). Cut both

9. (,

to TB6-

. Cover the positIve (+) lead with

1 1/2"

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

spaghetti.

Fig. 7.

4 (C).

11. (d

to TB6-2 (C). Connect the

12. (,0 Fig. 7.

XV12-

1 (C).

4 (S3) to TB6-

9(C).

2 (S3) to XV7-

spaghetti and connectto XV12-

orange wire from TB6-

positive (+) lead on the 30mfd electrolytic capacitor

will be connected later.

Connect a 3" piece of red wire fromXV12-

. Cover with a 1 1/4" piece of

1 1/2"

/Fig. 7. Cut the

13. ('\.

C39, to

7. Connect a 6" piece of

hi9'

14. (\

3 (S2). The other lead

-$-

TB2

XV10

C30

R56

XV9

TB19

TB18

C37

XV4

B15

Fig. 8

-$-

1 5

J 14

TB1

C29

R57

XV7

TB21

TB8

R25

shield to

. Connect the

other end of the

shield strands together.

. Connect the

3 (Sl).

from

3 (S2).

2 (C) to

(Sl). Dress away

3(C).

3 (C) to

1 (C)toTBl1-

2(C).

TBI8-3 (C).

2(C)toTB9-

T" to XV4-2 (Sl).

1 (C).

2 (C) to

3(C) to C37-B (C).

3 (C) to TB15-

from R24-

3 (C).

2 (51) to

3(S2) to TB11-

cable~ Twist the

/ /

Strip the insulation on the inner conductor back 1/4"

piece of single conductor shielded

the 30mfd electrolytic capacitor,

1 (C).

. Connect to TBI0-

Fig. 8. Cut the negative (-) lead on

(d)

1.

C39, tol 1/4"

. Twist the shield strands to-

conductor back 1/4"

TB21-2 (C). On the

5 watt resistor, R57, to 1 1/2"

Connect this lead to XV7-

ground lug R

1650,

the

black wire from TB8-

insulation back 1/2"

4 (51) and the inner conductor to J14, 15-

Strip the insulation on the inner

1 (C) and the inner conductor to

TB21-

same cable, strip the outer

gether.

2 (Sl), the

, connect the yellow lead to

) Fig. 8. Cut one lead on

13. (le

shield to J14, 15-

7 (S H,

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

Cut the ot~er lead to 1/2" and connect to

5 (Sl).

6 (C) to

orange lead to TBl-

green wire from XV7-

, T2

3 (C), the blue lead to XV7-

to TB5-

3 (S1), the brown lead to TBl-

Connect a 3 1/2" piece of

Fig. 8.

(C).

("~t

14.

the surrou,nding wires.

TB21-1

8 (C) to

electrolytic capacitors,

green wire from XVI 0-

, 25V,

7 (Sl), and the

output transformer

all leads on two 50mfd

1 (C), the red lead

Fig. 8. From the

2. ,,)

TBl-4 (C), the green lead to TB1-

black lead to TB 1-

Connect a 3 1/2" piece of

Connect a 3 1/2" piece of

yellow lead to XV8-

ym-

the bro

Fig. 8.

3. (V)

XV8-6 (C).

Fig. 8.

U)

4.

T8 19-1 (C).

Fig. 8. Cut

5. .

a froM 1811-1 (C)lo

piece of orange wire from TB18-

ieceofblackwirefromTB21-

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

Fig. 8.

piece of orange wirefromTB10-

Connect the grey lead from hole "

F)g. 8. Connecta 4"

/) Fig. 8. Connect a 3"

15. (,

16.

Connect the

17. (\i)/Fig. 8.

ground lug n G" (C).

18.

3 (S2). Con-

piece of red wire from TB18-

3 1/2" p;aca "hod who

a 4 1/211

fg. 8. Connect"

19. ~~

Fig. 8. Connect a 3" piece of red wire fromTB18-

r Fig. 8. Connect a 3 1/2"

20. ('vi Fig. 8. Connect

21. ( )

22. ("'

C37-A (0).

5 (S1).

2 (S 1), the

2 (C).

)' R56, to 3/4"

to TB2-

one capacitor toXV10-

3 (52) and the negative (-)

C" (Sl) at XV9.

positive (+) leads on both capacitors with a

Dress resistor away from

1650, 5 watt resistor

E" (Sl) at XVI0.

3 (S 1), the brown lead

transformer, T3, connect the yellow lead to

T" to TB11-

3 (S3), the blue lead to XV9-

7(Sl)and the orange lead to TB2-

brown lead from hole "

leads on a

second capacitor to XV8-

. Cover the

D" (Sl) at XV7.

Cut both

1 (C), the red lead to TB5-

yellow lead toXV10-

S. Connect the

Fig. 8.

piece of spaghetti. Connect the positive lead of

3/4"

C29, and C30, to 1"

lead to ground lug "

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

positive (+) lead of the

Cover one lead with a 1/2" piece of spaghetti and connect XV9-

nect the other lead to ground lug "

Fig. 8. From the output

(C)r the green lead to TB2-

surrounding wires.

7.

TB2-4

I /

black lead to TB2-

(Sl), t~e brown-

Fig.

(~f

8.

;::; 6. (\.

of bare wire to the dual concentric pots

front of the chassis. Connect

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

Connect a

Connect a 2" piece of black wire from R25-

3 (C).

Fig. 8. Connect a 1" piece

\l/

(\J) Fig. 8.

in the rectangular hole at the middle-

23.

(Sl) to R25::-

24. (\J fig. 8.

25.

XV3-7 (S 1).

(C).

2 (C).

one end of an 8"

3 (C) to TB 11-1

single conductor cable

piece "Iced wi'e from TB9-

1(C) and the inner conductor to TB21-

Connect the outer shield from the

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

) to TB21-

/;. Connect" 2 1/2"

Fig. 8.

(\1

10.

9. (J) Fi .

Fig. 8.

le li

(J)

11.

(from ho

Strip back the outer insulation 3/4" from

Fig. 8.

12. (~

TB18-2 (C).

-$-

R58

(32

R54

R52

R50

C34

R46

C28

(36

R40

C26

(24

:--i

E38

R42

r44

(22

(18

R24

-----

---

. """~) ~~.

",.

~ ~

\..'

~ .~

~'E!

Hi'

~ ~ ~~ (!. " '/'

~:i

g=

j.. ,) ~

"" """ / ~ ~'

-------- ~

"-\'J--. r

t"'

..."..

~'""= , ~~.

..

, ~ ~ -

,' ~

g - ~ ~ ' ~. ,- ~ ~ -~ - .-,,:... ..;;.

'" ~ :~..:~~

~~

~~~- ..

.~.

. ~"'" "" . .. ~, #- --

~~. , ",

--:\ \ ...)-

\.

. . '

~ '

~"

TB2

TB3

Lj1rdIif~

'Ut

,-

' " ,,, ' ~~~ "~, ",' ~~. -'\('/(

.., - -

....... ~ ~~ ----

'"

, - "'~ ~ ~" ,'~ €) ' - '

"" ' ~;

?;

' ~ ~ ~

~) ~ ... " ,

~\:y

~~~ ,

TBl TB20

TB4

4-

~U

,,1

"dJ:;!L.

ff:

~ 0

~ o-

~"1

0 "';' ~~

- c~

!:51$ I

I!iJI!J.

r---.

-V

--'c

t!

IIJ/i)

/h

rtO1 p= i\O\ 110\ nO!

1Wl!'

t---.

~dOl

d2;

~O!!'" ~-

Q:

' I ~~)

~;J ""-~

u 12

; ~ z~

,gJ(

?J",

-c .

"!'O0\"'i!t 1,./

Io

"t\

~r'

'Ii -"".

:H:;~ _

""e---

~~c~

, o-

~~. c-

R .

7. -

l"r'

~~,; ~~C

,\1

Wl'-' ~

5""""""

l1'\~

"it".-.

I '

~:::- ~i.l:

fi' ~

(9FJ 2

I----.

l!f\!HJ

:w~u;r

0 ~

1!iJ/fiJ

--(L ~

w b--

i- "

~,'~J~

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

f 0 '" '

i~ts:~ i1); \;J

-~:,r

AJ/i)

) J '

f~~~~i" )

C 1

(1?r

v:'

----.U

Fig. 9

Y ~\'\.

~I

: ~

~ ~

-,~~: ~~

/j, ~---

' '~ ~!\"

.., '

~' (( '"

~/'\ ~)

, ~ ~ "'--: .....

- ,

~ ~,":,\

R59

:k~ I

~I

n-

10 -

~\ ((I)

R48

R55

(31

i-

'~ij 1'.

II ,I

,p'rr ~ ~,L\.

R51

R53

R49

(25

-1::

r-

.~ W""Y

S ~

(35

(33

I.~L; 7."""""

-I'

,.0

1Y:'

S ~?'

I~ ~

I-!t' ~v.," '

R45

C27

Y\

-I-

l---

0 ~o~ ~-

H~

k \ ~ '

R47

R43

C23

R41

R39

(21

C17

Con-

2 (S5).

1(S1).

7(Sl).

6 (S3).

6 (S3).

with a

1 (C)to

1 (C) to TBI0-

3 (C) to ground

Connect C28

" I" (53). Connect

l (S3).

2 (C).

R45 from XV5-

2 (C).

1 (S3) to TBI0-

1(C) to TB9-

. Connect

. Connect R47 from XV5-

3 (C) toTB19-

leads on the two 100KO (brown, black, yellow, gold)

R45 and R46, to 1/2"

R44 and R47" to 3/4"

Fig. 9. Cut all

~j

5% resistors,

14. (

(S2). Connect R46 from XV6-

5% resistors,

the two 225mmf disc capacitors, C25 and

from XV5-

Cut all leads on

Connect R44 from XV6-

1" (C).

lug "

. Connect C25

Fig. 9.

,or)

15.

C28 to 3/4"

two 225mmf disc capacitors, C26 and

3 (S3) to ground lug

2 (S3).

all leads on the

C27 from XV5-

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

3 (S3) to TB 19-

from XV6-

. Connect

) Fig. 9. Cut

16. (\#

C27, to 1"

C26 from XV6-

1 (S5).

2(C)toS5-

8(S2) to TB7-

8KO (brown, grey, red, gold) 5% resis-

1 (C).

. Connect R43 fromXV5-

XV5-6(C) to TB9-

1 (S2). Connect C24 from XV6-

2 (S5).

. Connect R39 from

two 150mmf disc capacitors, C23and C24, .

6 (C) to TB9-

pieceofbarewirefromTB7-

leads on two 470KO (yellow, violet, yellow, silver)

6 (C) to TB18-

all '

R39, to 3/4"

9. Cut all leads on two 1.

9. Connectal1/4"

Fig. 9. Cut

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

. Connect C23 from XV5-

17. (\')'j:ig.

tors, R42 and R43, to 3/4"

18.

nect R42ifrom XV6-8 (S2) to TB21-

resistors, R38 and

19.

Connect R38 from XV6-

to 1"

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

20. (')'Fig.

1 (S2). Con-

Dress the leads as

2 (C) to XV6-

2 (Sl) to XV5-

from TB21-

2(S1) to XV6-

black, yellow, yellow)

from XV3-

. Cover each lead

2 (C).

1 (C) to TB21-

C17 from XV3-9 (C) to TB8-

2(S2). Connect C21

of bare wire from XV6-

C21 and C22, to 3/4"

1/1 piece

C18,

all leads on four. 1 mfd (brown,

spaghetti. Connect

flat against the chassis.

6(C) to TBl1-

9. Connect a 3/4" piece of bare wire

from XV4-

1 Fig. 9. Connect a pI pieceofbarewirefromXV5-

21. (\) Fig.

22. (,.

/~i9' 9. Cut

("J Fig. 9. Cut a

23. ,

1/2" piece of

24. (\

molded capacitors, C17

nectC18

TB7-2 (S4). Connect C22 from XV4-

shown and push all capacitors

/,

7(Sl).

(C).

1 (C).

1/2"

2 (S1).

1/2"

1 (S3)

1 (S2) to ground

5(Sl)toXV4-

8 (C) to TB3-

l (S2) to TB3-

wire frQm TB2-

47mmf, 10% disc capacitors, C31 and

4 (C) to TB3-1 (C) and the other capaci-

bare wire from TBl-

, orange, gold) 5%

4 (S3) to TB3-

pieceofgreenwirefromR24-

all leads on two

R59, to 3/4". Connect R58 from TB2-

Connect a 9" piece of black wire from XV5-8 (C) to T84

9. Connecta21/2"

1. (\)Fig.

9. Connect a 9" piece of black wire from XV6-

Fig. 9.

2. (1) /

3. ( ) Fig.

. Connect C32 from TB2-

Fig. 9. Cut

(vi

4.

C32, to 3/4"

9. Connect a 1" piece of

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

/ Fig. 9. Connect a I" piece of bare

H;' (Sl).

tot, C31,

piece of spaghetti.

5. h)Fig.

lug II

6. ( )

4 (S3) to 184 (S3). Each lead is to be covered with a

Fi.g. 9. Cut all leads on the two 22KO (red, red

piece qf spaghetti.

and R59 from 1B 1-

7. (\

resistors, R58 and

XV8-6

8 (C) to

8 (S2).

1 (C).

2 (Sl). Con-

2 (C) toXV9-

. Connect R55 from

10KQ (brown, black, orange, silver)

2 (C). Connect R40 from

Connect R52 from XV9-

1 (C) to 1B9-

2 (S 1)

from TB 19-2 (C) to TB 19-

2 (C).

resistor from XV7-8(C)toXV7-

. Connect R50

1 (C) to TB20-

leads on the two 330KO (orange, orange, yellow, silver)

8 (S2) to XV1Q;..

R52; R53, R54, and R55, to 1/2"

Cut all leads. on the six

2(Sl). Conne~t R53

2 (C).

R50 to 1/2"

Connect R41 from TB9-

Connect a 3" piece of grey wire from TB20-

1 (C) to TB18-

(\;1 Fig. 9.

8.

2) to XV8-

TB18-

nect R54 from XV10-

XV9-2 (S 1).

10; (fI) Fig. 9. Cut all

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

resistors, R48 and

Connect R~8 from TB20-

C34

1 (C)

OOOmmf) disc

from XV5-

1 (C) to XV7-8 (C).

orange, yellow; silver)

025mfd (25K or 25,

" I" (C).

R49 from TB 10-

. Connect

6 (C) to ground lug

R51 to 3/4"

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

resistors, R49 and

Cut all leads on the four.

Fig. 9.

12. (\;

Connect R51 from XV7-

3(C) to TB19-1 (S3).

6 (S3). Connect

. Connect C33

3 (C) to XV7-

C35, and C36, to 3/4"

8 (S3). Connect C35 from XV5-

capacitors, C33, C34,

to XV7-

100KO (brown, black, yellow)' gold)

C36 from XV6-

2 (S3). Connect

all leads on the two

Fig 9. Cut

13.

from XY6-1 (C) to TB20-

... res istors, R40, R41,

-0 (S.

!-. ---..

' .

~ ~

~ ~-

----

..

~ ~

~ .'. -

T B 1 3

13 R

J:J~

R~9 J

f:j

TB17

/ V

. '6J

J/ia

R12

t5 .....

(2)

~r,~

L" r

t ,

... I'

C48

R34

.... TB14

"'7'

~i:

~~jtPs.~

~o

;J~ ~

c -,

rl

r:::::=--

, ,c (01. ~

R36

t01

. 'n

-1IO1no1

fi 0

'0

0;(~

JX V1

r---

~oilMJol

OJ

I~

,n.. 0 II

\IT B 1 5

TfOUI.." I

R26

~ 11~iD.

T B 12

\I

Fig.

-I. II

~1f\~ \'

~'

1 0

~ -

~~\ ~ ~~

: ,

~/~

- ! ~~-

~'(

~~~

,(~~~~

~~ ~ ~

: !~~

~ -

' . - . ., ---

'" =-- ~ ----

~ ~"

(~

€) ~

. " . ~ .

- ,

--- ~

~:.:../

), ~

.j ~

..... ~

~~

-- ~

~\--

""'-

. '

~ ~~ - ..

.."",..- """ -- "". ~ ---

~"\, '" ~

~/

, ~ , \" ~'

~ j. -\.~~ ~

J~,

III

it\~ "

Ft.

00:

-r;~:'

. O

", I"

1~ M,'.,~s:!

l"':'

v:F

t. .

1$

~) I'

t~~

f.'

;;;\'1

\t

~~J

-r/

~ I

':1:-, = ~..

r.o'~ I

~ rv'

I' ~

~~ ~ J~

~ ~ c

\ ~Ar3

s:!

' \l......

,-;';'f',.

\0\-

rfJ

r ~ J '

11

. 1,(9)

~ I ,

~"U"

~,'.,\.-.rY'\!,

' ~ 1ICJ'

/./-"I7/(tJ'g-r

jjI'( I

' y 0

V,

~jJ.;

(..4J..

~JI ~ k.... -

.(.J.J

z~t

~: (OJ,

,~rh. :A

.I

~ If(~,

i. L I

0 '

-.a.,., ,

t1fjtj. ' 15.0)

\ 1'-' .

J 7~l(

~ 1.11

F'7.

1/

.-r

~ l

J--

ft ~

/JJ

(f J

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

~~ - ~ . ......

-!,'

~ ~ "",,,' ~......~

""" ~~...

-.. /"

~~ /' ~ . ~"

. . ~

",

~ -

"~-::' ~ ~. ~ . , "

~/\

~.

~ ~

\(('))

~( ~~ =-

......

~~ ,. """ .......

~ .

~ ~ ~ ----=:::::::::: '""

$-.

~,

"'"

~~r ~

1I1

il;L

I"

1:'

R37,

TB2

TB9.....

C47.....

JjA~ ~

!en~Ji0"'

'P I

')!~I

~ C-

fro)j

'.1: I""'"

~~-;v-

($ i:'~..;r' ~'

~-J" llil

L/

IJ:~

1)(\r:J

i&L

R35-

XV4 gL~

8 ~

~~ '-.t.

R27

R29 R

JSl)

S5

TB

4~

J,

/I I'

A ,1;j,)

".,\ j T

C1

T B 8

C 16

~:D

R28-

3(C).

4 (C).

3 (C).

2 (C).

1 1/4"

yellow, silver)

2 (S2) to Jll,

3 (C).

3 (S2);

9, 10-

5(S2); connect

12)' 13-

5 (S2); con-

13-

2 (C).

2 (C).

6(C).

2 (S2) to

XVl-

TB12-4 (C)

II to

SlG-12 to TB14-

inner conductor to TB12-

inner conductor to TB 14-

grey lead from SIB-

shield from the single conductor shielded cable

2 (C). Connect the

5) to TB12-

~ig. 10. Connect the greylead from

2 (C). Connect the

") Fig. 10. Connect the

16. (. ) Fig. 10. Connect the

17. (,)

from SlB-

18. ("

(from S 1 G-6) to 1814-

5 (C).

covered with a 1 1/4"

toJl1, 121

red lead to J8,

9, 10-5 (C).

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

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

Fig. lO.

Fig. 10. Connect a 1 1/2" piece of bare wire covered with a

19. (\/)

20. (\,)

/Fig. 10. Connect a 1 1/2" piece of bare wire

21. ( ).

piece of spaghetti from J8, 9, 10-2 (C) to J8,

piece of spaghetti from Jl1)' 12

2 (S2) to J8, 9, 10-

100KQ (brown)' black,

R68 from J11, 12, 13-

4 (S 1).

9, 10-

. Connect

leads on two

the three conductor shielded cable from switch wafer

9, 10-1 (Sl), connect the

R69, to 1/2"

Connect R69 from J8,

Fig. 10. Cut all

Fig. 10. Run

; (C).

22. (,

resistors, R68 and

12, 13-

~3. (,I)

S~Balong the chassis as shown. Connect the shield to J8, 9, 1O-

the brown lead to J8,

""an~ connect the orange lead to J8, 9, 10-

connect the red lead to J11,

Jll, 12, 13-4 (St).

three conductor shielded cable from switch wafer

chassis as shown. Connect the shield

Fig. 10. Run the

24. (\)

SlH along the

(S2); apd connect the orange lead to

nect the brown lead toJ11, 12, 13-1 (51);

4(C) to XVl-

from TB12-

from TB14-4(C) to XV2-

C (C) tp

R11 from TB15-

XV2-1 (C).

6(C). Connect

. Connect R5 from C37-

leads on four 200KQ (red, black, yellow, gold) 5%

~om TB17 (S3) to

2 (52) to XV2-

Fig. 10. Connect a 2" piece of grey wire

I)

25.

Fig. 10. Cut all

Fig. 10. Connect a 3" piece of grey wire

27. (')

26. k)

resistors, R5, R6, R11 and R12t05/8"

Connect R6 from TB13-

XVl-1 (G). Connect R12 f

silver) ')

3 (S4)!

yellow, silver)

black,yellow,

1 (S2) to TB 18-

Ii'

(brown,

150KQ (brown)' green)'

3 (S2).

. Connect R34 from XV4-

1 (S2) to TB9-

! /

j,

---"" """" """ "'--" ""' ..""" ,.'

Fig. 10. Cut all leads on two 100KQ

1.

resistors, R34 and R35, to 1/2"

Connect R35 from XV3-

. Connect R26 from XV4-6 (S2) to TB15-1 (52).

to 1/2"

Cut all leads \)n two

R27,

resistors, R26 and

"2~ ('v) Fig. 10.

10%

2 (S4).

8 (S2) to T88-

OOOmmf) disc capaci-

from XV4-8 (C) to 1811-3 (C).

, from XV3-

1. 8KQ (brown, grey, red, silver)

1 (S3).

3 (S5).

02mfd (20K or 20,

. Connect C 15

8 (C) toTB8-2 (C).

Cut all leads on two

R29, to 1/2". Connect R28

(\/) Fig. 10.

3.

Connect R27 from XV3-6 (S2) to TB11-

resistors, R28 and

Connect R29 from XV3-

8 (S2) to TBll-

16, to 1/2"

Fig. 10. Cutall leads on two.

(J)

tors, CIS and C

4.

Connect C16 from XV4-

1 (C).

2(C).

C37-C (C).

3 (C) to ground lug "

OOOmmf) disc capaci-

from TB17 (C) to

G" (C),

from XV3-3 (S2) to TB21-

OOK or 10,

1 (C).

3KQ (orange, orange, red, silver) resis-

R36 from XV4-

3 (C) to TB21-

on two. 01 mfd

. Connect C47

3 (S2) to ground lug "

of black wire from ground lug "

orange wire fromC37-C (C) to TB15-

2 (C).

and R37, to 5/8". Connect

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

tors, R3(/

(C). 96nnect R37 from XV3-

6. (/) Fig. 10. Cut all leads

tors, C47 and C48, to 3/4"

Connect C48 from XV4-

Fig. 10. Connect a 3 1/2" piece

Fig. 10. Connect a4'! piece of

('\l

7.

~12-

8. (,)

(C) to"'

9. (V) Fig. 10. Connect a 4" pieceo(orange wire

G" (C)

2 (C).

1 (C).

from ground lug "

lO to TB12-2 (C).

single conductor shielded cable

orange wire from Ta17 (C) to TB13-

piece of black wire from TBl4-2 (C) to

lead from SlD-7 to TB12-

black lead from SlA-

lO. Connect a 4" piece of

(C).

Fig. 10. Connect a 4 1/2" piece of black wire

10.

to TB14-

Fig. 10. Connect a 3 1/2"

11. (\)/P/ig.

12. ('I~

10. Connect the

Fig. 10. Connect the brown

I)

14. (

13. (\);Fig.

TB 13- 1 (C).

Fig. 10. Connect the shield from the

qn

15.

R19

R65

R66

TB12

R13

TB21

Fig. 11

tI.)

tI.)

RIO from XV2-

, green si Iver) resis-

, black

" G" (C).. Connect

both leads with a 1/2" piece of spaghetti.

. Cover

2 (S2) to ground lug

, to 3/4"

1 (S4).

/'

/ '

10. (,A'Fig. 11. Cut all leads on two IMQ (brown

tors, R9 and RIO

(S2) to 1BJ3-

Connect R9 from XVI-

1 watt resis-

B (C).

, orange, silver)

a 68KQ (blue, grey, orange, silver) resistor

. Connect from f:.37-A (S2) to C37-

, R61 to 3/4"

11. ~YFig. 11. Cut both leadso(la22KQ (red, red

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

tor

3 (C). Connect R20

, orange, yellow, silver)

2 (C) to S3-

to S3-1 (C). Con

(S3) to C37C (S4)0

19 from S3-

. Connect R65 from S3-2 (S2)

eads on two 68KQ (blue, grey, orange si Iver) resistor,

to S3-6 (C).

)C)

Fig. 11. Cut all I

, to 1/2" . Connect from C37B

13. ( )

R60

R 19 and R20 to 1/2" . Connect R

from S3-

R65 and R66 to 1/2"

14. (.!Fig. 1. Cut all leads on two 330KQ (orange

resistors

1 (S2).

of the

2 (S2)0

6 (S2), th~ brown

l,ead to S3-

3 (S2) and the green

, 3" from the solder

S to 1"B14- 1 (S3).

grommet at the rear

1 (S2) and the other lead to J16-

" S" connect the white lead to S3-

ll. Connect the' brown lead from Sl F-

11. From hole

(~i9'

150

nect R66 ;10m S3-5 (S2) to S3-4 (C).

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

~ect one lead to J16-

Fig. 1. Push the line cord through the

(\,,1

16.

chassis, near the fuseholder. 1ie a knot inside the chassis

~i9.

17. (

lugs. Con

7(S1).

Use

G" (S9).

5" piece

, connect

6 to ground lug "

SI F-

piece of bare wire fromS5-2(Sl) toXV5-

11. Connect the black lead from

11. Connect a l"

jig.

18. (\

19. (\rFig.

. On one end , cut the shi eld

3 (S 1). On the other end

Twist the shield strands. Strip back the in

1 (SS) and the inner condu,ctor on the same

32 hex nuts.

Strip back the outer insulation on both ends of a

cable 1/2"

Mount the top shiEddasshownininsert on figure 4.

(S5).

Fj,Q; 11.

r ~11.

20. ,,)

of singl~nductor

sulation on the inner conductor on both ends 1/4"

end to 1B21-

the twisted shield strands to 1B21-

strands and connect the inner conductor to S5-

21.

two #6 IVckwashers and two #6-

, R7

2(C)0

, C5 and

2 (C). Connect

) end to TB14-

) end to 1B12-

spa~hetti. Connect

, silver) resistors

8 (S2) to 1B14-2 (C).

R8 from XV2-

2KQ (red, red, red

8 (C) and the negative (-

leads on two 25mfd electrolytic capacitors

, cut

lead

this end

marked with a line)

. Connect

(If it is not marked

. Connect the 1/2"

, to 1"

1 to XVl-6 (S2) and this end of C2 to

(if the capacitor is so

of both capacitors to 3/4"

, C 1 and C2

lOKQ (brown, black, orange, silver) resistors, R3 and

this end of C2 to 1B14-4 (S3).

, Con-

2 (S7).

1 (C) to TB 12-

black green silver) resis

3 (C). Connect the 1/2" lead

3 (C).

from 1B 12-

from 1B12-3 (S3) to 1B12-2 (C),

2 (S8).

0012mfd (1.2KorI200mmf)disc capaci-

. Connect C41

1 (C) to 1B14-

8 (C) and the negative (-

Connect this end of C

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

!Fi9. 110 Cut all

Fig. 11. Cut all leads on two 2.

1'

, to 1" and cover each with a 3/4" piece of spaghetti. Connect the positive

1. (V

(+) end of C5 to XVI-

the pos;,lve (+) end of C6toXV2-

R7 from XVl-8 (S2) to 1B12-2 (C). Connect

2.

and R8, to 3/4" and cover each lead with a 1/2" piece of

either end to 1" 0 )

of two. 25 mfd paper capacitors

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

XV2-6 (S2). Cut the other end

Fig. 11. On two

U)

, cut one lead to 1/2" and the other lead to 3/4"

of Cl to 1B12-4 (S3) and

4.

of R3 to XVl-7 (S1) and the 3/4" lead to TB12-

of R4 to XV2-

, to 1/2" . Connect Rl

C42 from TB14-

)Fig. 11. Cut both le€lds on two IMQ (brown

5. (.

Fig. 11. Cutailleadson two.

(v)

nect R2 from 1B14-3 (S3) to 1B14-2 (C).

tors, C41 and C42 to 1/2"

6.

Connect

~ tors, Rl and R2

1 (S3). Con-

000 mmf) disc capaci-

)Ieadtoground

3 (C) and the negative

, silver) re-

l (S2) to TB12-

, 6 volt electrolytic capacitors

7KQ (yellow, violet, red

3(C)andthe negative (-

025 mfd (25K or 25

end ofC4 to XV2-

1 (C) .

. Connect C7 from XVl-

1 (S2) to 1B14-

. Cover ~ach lead with a 1/2" piece of spaghetti. Con-

, to 3/4"

Fig. 11. Cut all leads on two 10mfd

C7 and CS

tors

nect C~/from XV2-

7. Fig. 11. Cut all leadson two.

8. y)

" G" (C). Connect the positive (+)

lug

nect the positive (+) end ofC3 toXVl-

C3 and C4, to 3/4"

Fig. 11. Cut both leads on one 4.

) lea9' to 1B13- 1 (C).

9.

3/4"

1 (C). Connect

G" (C).

;7KQ r~sistor, R13, to

3(S2) to TB13-

3 (S2) to ground lug "

, R14 to 1/2" and both leadsol1asecond4.

R13 (with the longer leads) from XVI-

sistor

Connect R14, (with the shorter leads) fromXV2-

#4-40x1/4 Screws

Control Plate

Fig. 12

Brown Screw

#6 Pk.

#8-32x3/8 Brown Screw

Side Bracket

::. ,::.

...~g~.

Bezel

Chassis

Tinnerman Angle Bracket

ffi'o

O~O

.~...~o

#8-32 Tinnerman Nut

000

O~~~\~~:

Screw

#8 Pk.

The flat portion

" on the side pieces

rails

perforated

brown colored

Press the plastic pilot

40 x 1/4brass screws,

follows:

K. Ty~e Z screws.

ifier

. Read

the INSTRUCTION

RESISTANCE chart

Mechan-

Elec-

c line

etc., to the

oswell as a-

bezel.

to the side pieces with four #6 x 1/4

Insert the perforated cover into the "

Fig. 12. Fit the bezel and control plate over the projecting control

of the cabinet from the outside, using a small screwdriver.

9. ( ) Fig. 12.

should be the actual resting or contact surface.

10. ( ) Fig. 12. Mount the control plate on the bezel (locating the hole for

and slide it forward fully.

'410ckwashers and #4 hex nuts to fasten it to the

the plastic pilot jewel, above and between the focus and bass controls, over

the corresponding hole in the bezel), using two each #4-

11. ( )

jewel into place on the control plate.

Before tightening the screws finally, be sure there is adequate

P. K. screws.

cover. Assemble the bezel

and sl ide switch shafts, onto the ends of the side pieces and the

tet-

When

See tube

Electrical Installation "

Then read the section titled "Oper-

titled "

perforated cover to the two tinnerman angle

Fig. 12. Fasten the

12. ( )

two angle brackets on the side brackets using four #8 P.

. play to slide the perforated cover out.

brackets (previously mounted on the rear edge of the chassis surface) and the

a FUNCTION SELECTOR at STEREO; FOCUS

13. ( ) Fig. 12. Set all controls to the furthest counter-clockwise position.

INPUT SELECTOR knob at AUX;

Mount the knobs on the shafts with the indicating dots pointing as

14) OPERATIONAL CHECKS ON COMPLETED KITS: In

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

minimum

in accordance with the instructions given.

part of this manual you wi II find a section

this carefully and connect your speakers, phonograph)' and tuners to the ampl

, read carefully the "

phonographs, tuners,

ampl ifieroutputs,

As the Trouble Shooting Chart presumes a

may not be the case, recheck the wiring for

all the controls, checking aurally for the results

of the instructions and follow the procedures outl ined.

II and operate

the TROUBLE-SHOOTING chart and the VOLTAGE &

properly wired amplifier, which

described. If the amplifier does not operate at all or operates incorrectly, use

ating Instructions

errors or reversed connections and continuity.

discover and remedy the difficulty.

II section

15) If the amplifier is to be mounted in a console

16) Detailed information as to connection of

icol Installation

" section.

plug connections and' use of the hum adjustment control, is given in the "

trical Installation

amplifier inputs and speaker systems to the

shorter

ready for use.

ampl ifier will be

assembly and wiring of your amplifier.

FINAL STEPS

loose lumps of

(and preferably also against the

or leakage paths arising from the

spring contacts when cleaning switches).

While doing so, check for rosin joints,

point against the wiring instructions

by-

1) To catch any wiring errors, it is suggested that the entire wiring be checked

you have completed the following steps your

You have now completed the

layout and circuitry).

point-

schematic wiring diagram in order to become more familiar with the component

rachloride, being careful not to

flowof rosin between contacts (remove with a stiff brush dipped in carbon

solder, poor leads dress, and accidental shorts

measurement.

screws, two #8-

the power supply com-

Be sure to insert the cqrrect

If you do not obtain the

tubes VI, V2, V3, and V4.

resistance of at least 40 ohms between

ohmmeter battery in this last

32 x 3/8 brown colored

left and right side pieces to the chassis. Each.

Insert fuse Fl, in fuse holder.

1 of XVII and XVI2; check for a resistance of at least 200KQbe-

mounted with two #8-

Insert tubes VI through V12 in their sockets.

3) If you have a VTVM or VOM, make the following resistance checks before

connecting to the a-c line: Check for a cold d-c resistance of at least 1/20hm

layout in instruction.

2)

tube in each socket. Place a shield over

across the a-c I ine plug; check for a

capacitors to be charged by the

tween pin 30fXVll, XV12and ground. Allow sufficient time for the electrolytic

ground and pins

resistance values indicated, do not procede to the next step until the cause is

ponents and wiring before applying power.

These measurements constitute a reasonable check of

discovered and the condition remedied.

side piece is

4. ( ) Fig. 12. Assemble the

mount the two tin-

Type Z screw for each.

a #8 P. K. -

holes. The

provided in the botiom

flanges of the sidepieces,

chassis apron.

of each side piece, press a tinnerman

towards you.

Install the rubber feet in the openings

32 x 3/8uncolored screws. Note that the rear flange on He bot-

12. Mount the bottom plate on the bottom

Fig. 12. On the rear edge of the chassis surface,

Fig. 12. On the bottom flange

Fig. 12.

32 - Type J speed nut in place over each of the three

7. ( ) Fi

5. ( )

hex nuts, and two #8 lockwashers.

nerman speed nut angle brackets, using

#8-

6. ~ )

using six 8-

length of the nuts face up

8. ( )

tom plate fits over the outside of the rear

into the interior

is to work the rounded portion of each foot

plate. The method

news-

Elec-

instrument, giving

C. 1, New York. Re-

immovable within the con-

Before returning this unit, be

Is inserted to keep the instru-

Note that the carrier cannot be

IN HIS OPINION, is insufficient.

the unit. Pack very carefully in a

NOTE:

show evidence of acid core solder or paste

mounted. Attach a tag to the

Railway Express, if possible, to the

00 Northern Blvd., L.

damages in transit if packing,

cepted for repair. Instruments that

fluxes will be returned not repaired.

your home address and the trouble with

rugged container, using sufficient packing material (cotton, shredded

sure all parts are securely

inserts are used or sufficient packing material

paper, or excelsior), to make the unit completely

tainer. The origInal shipping carton is satisfactory, providing the original

ment immovable. Ship by prepaid

held liable for

tronic Instrument Co. , Inc., 33-

turnshipmentwill be made by express collect.

Instru-

will not be ac-

place them on the

department listing all

damaged in the course of

4 for placement of small label.

to completed instruments con-

If desired, you may return the in-

placed in operating condition for $12.

SERVICE

instructions as stated in the manual.

parts replaced due to their being

If you are still having difficulty, write to our service

Remove the backings from the two large labels suppl ied and

outside surface of the bottom plate. See figure

possible indications that might be helpful.

construction. This service policy applies only

plus the cost of

strument to our factory where it will be

ments that are not completed or instruments that are modified

structed in accordance with the

2 book:

New York

This is a direct replacement.

Long Island City 1,

2 ADDENDA

MODEL HF81-

Please make the following corrections to your HF81-

#18045

Page 16, Symbol #R22, 23 Stock

Page 7C, Step 7.

Schematic R22 and R23.

instead of 330KC

Inco,

1500

Pin 7 should read

Electronic Instrument Co.,

Part supplied may be dual 500KC instead of 750KC.

It does not impair the performance of the amplifier in any way.

Page 13. va,

E. 1209