Heathkit AA15 SERVICE MANUAL

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Assembly and Operatio

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OLID-STATE STEREO A

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MPLIFIE

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HEATH COMPAN

BENTON HARBOR, MICHIGAN 49O2

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Your Heathkit Model AA-15 Solid-State Stere

Amplifier will provide you with the ultimate in

high fidelity reproduction. Front-panel rocker
type switches are used for the selection of Mode
Tape Mon, Tone Flat, Loudness, Main speakers,
and Remote speakers. Dual Bass and dual Trebl
controls are used in each channel. A Balan

control permits the attenuation of either the right
or left channel signal to compensate for speaker

placement, room acoustics, or other factors that

might otherwise produce unequal sound level

from the speakers

Individual input Level controls, which only nee

to be adjusted occasionally, are located behin
a small door in the front panel. A separate Level
control is provided for each input channel of the

Phono, Tape, Tuner, Tape Monitor, and Auxiliar

inputs. These Level controls enable you to hav

e

qual sound levels when switching from one

source to another

A back-lighted dial, a die cast front panel and a

walnut cabinet (optional) give the Amplifier a

impressive appearance that matches its high

erformance.

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Remote speaker systems can be used in conjun

tion with your main speaker systems with this

Amplifier. Any type of high fidelity speaker

that have an impedance between 4 and 16 ohms

,

can be used. Phone jacks are provided on th
front panel so two pairs of stereo headphone
can be used simultaneously. The Speaker switch
es on the front panel will turn off one or bot
speaker systems if only headphone listening is
desired

Thirty transistors and eighteen diodes are used
in the most advanced simiconductor circuitry.
Most of the components are mounted on fiv

printed circuit boards; there are only a fe

chassis-mounted parts. Two cable assemblies
with color-coded wires, connect to numbere

d

h

oles in the circuit boards to minimize assembly

time and reduce the possibility of wiring errors

Overload protection makes the power amplifier

e

circuits virtually short-circuit-proof. Should the
speaker leads be shorted together accidentally

the zener diodes will limit the current in th

output transistors. The thermal circuit breaker

will cut off the DC supply voltage should the out

put transistors in either channel become too hot.

These circuit breakers close automatically whe
the temperature of the output transistors returns
to normal

.

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UNP

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KING

The Amplifier packaging consists of the large

shipping carton, which contains smaller pack

ages and a number of loose parts. Some of the

smaller packages have numbers 1 through 5

stamped on them (#1, #2, etc.). After these

numbered packages have been removed from

the large carton, the remaining parts in th

carton will be part of package #5.

You will be directed to open each of these pac

ages as they are needed. Each of the assembl
sections of the Manual contains its own Parts
List and Step-By-Step instructions. At the

beginning of each Parts List you will be instruct

ed which numbered package to open. You will
also be directed to remove some of the part

k

from package #5 to complete each assembly

section.

To avoid intermixing parts, do not open any of the

parts packs until directed t

ginning of one of the Parts Lists. Any part that i

e

packaged in an individual envelope with a par

number on it, should be placed back in its en

velope after it is identified, until that part is

called for in a step.

y

Refer to the "Kit Builders Guide" for additional

information on unpacking, parts identification
tools, wiring, soldering, and step-by-step as
sembly procedures.

s

o do so at the be

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,

HBATHKIT

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PARTS LIS

Unpack the package marked 1 and check each par
against the following Parts List. The numbers i

parentheses are keyed to the numbers on the

Phono Preamplifier Parts Pictorial. Any part
that is packaged in an individual envelope with
a part number on it, should be placed back in

PAR

No.

RESISTORS

1/2 Wat

(Dl-3

1-1

3

1

-

16
1-109
1-121

T

PARTS

Per Kit

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DESCRIPTI

2
2
2
2

1

100 ft (brown-black-brown
2700 ft (red-violet-red
4700 ft (yellow-violet-red
12 kft (brown-red-orange)
120 kft (brown-red-yellow)

ON

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)

T

its envelope after it is identified, until that

t

part is called for in a step.

n

To order replacement parts, refer to th

Replacement Parts Price List and use the Part
Order Form furnished with this kit.

(3)25-5

)

)

(4)27-6

T

4

6

8

PARTS
Per Kit

6

PAR

No.

CAPACITOR

25-5
25-14

27-69
27-85

DESCRIPTI

S

2

V

2

^

2

^

10 fxF electrolytic, 15

100 ^.F electrolytic, 10 V

,-100 jllF electrolytic, 30 V

^

^..0033 fiF (3300) Mylar*

^^<0091 juF (9100) Myla

.22 (0.22) ^.F Mylar

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1/2 Watt

(2)4-12

4-2

3

4-2

4

4-4

0

4-3

2

4-3

3

•DuPont Registered Trademar

5% Low-Nois

2
2
2
2
2

2

e
390 ft (orange-white-brown)
22 kft (red-red-orange
24 kft (red-yellow-orange

51 kft (green-brown-orange
390 kft (orange-white-

yellow

470 kft (yellow-violet­yellow)

)

k

)

TRANSISTORS-SLEEVIN

(5)417-91

417-135
346-

1
)
)

ITEMS FROM PACK 5

i

85-165-

5

97-308
97-26

5
391-3

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4

G

2

2

1

1

1
1
1
1

2N5232A
2N3859A

Small sleevin

Phono preamplifier circuit
boar

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Kit Builders Guid
Parts Order Fro
Blue and white labe
Manual (See front cover for
part number.)

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Page 11

START

CAUTION: When soldering parts on
the circuit board, do not use to
much solder. This could cause a so
der bridge between two foils tha
should not be connected together.
If a solder bridge should occur
reheat the connection and quickly

b

rush away the solder between th
foils. Also, after soldering several
com

ponents, wipe the tip of the so

dering iron with a cloth or a dam

s

ponge. Keeping the tip clean wil

insure better solder connections.

51 kn 5%(green-brown-orange),

low-noise

390 n 5% (orange-white-brown)
low-noise

2/00 n (red-violet-red)

[^7 390 kn 5% (orange-white-

y^flow) low-noise

low-noise

r ) 470 kn 5% (yellow-violet-

/yellow), low-noise

<y) 100 n (brown-black-brown)

22 kn 5%(red-red-orange), low-

iise.

^ 120 kfl (brown-red-yellow)

^/) 12 kn (brown-red-orange).

( ) Solder all leads to the foil side

of the circuit board. Do not fil

the unused holes with solder

After solderi
cess lead lengths

.

.

.

.

kn 5% (red-yellow-orange)

.

.

.

,

ng, clip off the e

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CONTINU

NOTE: When installing the resis

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tors in the next two steps, use 3/4"
lengths of small sleeving on the in
d

icated leads. As each resistor i
installed, solder the leads to th
foil. /

(^^ 4700 n (yellow-violet-red) a

hole 3.

^T 4700 n (yellow-violet-red) a

hole 1

.

('•"•') 51 k^^ 5%(green-brown-orange).

low-noise

() 390 n 5% (orange-white-brown)

low-noise

1/2700 n (red-violet-red).

Y) 390 kn 5% (orange-white

yellow), low-noise

(/) 24 kn 5% (red-yellow-orange)

low-noise

wllow), low-noise

(*-') ip6 n (brown-black-brown)

22 kn 5%(red-red-orange), low­noise

(U^ l^kn (brown-red-orange).

Solder all leads to the foil and
cut off the excess lead lengths.

NOTE: Set aside the remaining
length of sleeving: it will be used
later

.

PROCEED TO PICTORIAL 1-2.

.

.

.

kn 5% (yellow-violet-

.

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PICTORIAL 1-1

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START

Page 1

3

NOTE: Install the transistors in th
following manner, as shown; First

ine up the flat on the transistor wit

l
the outline of the flat on the circui
board. Then insert the transisto
leads into their correct holes whic
are indicated by C, B, and E. Pos
tion the transistor 1/4" above th
c

ircuit board. Then solder each lea
to the foil and cut off the excess lea
lengths

.

( ) Transistor 2N5232A (Part #417

91) at Q1R

( ) Transistor 2N5232A (Part #417

91) at Q1L

( ) Transistor 2N3859A (Part #417

135) at Q2R

.

.

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( ) Transistor 2N3859A (Part #41

135) at Q2L

( ) Recheck the transistors to make

sure the leads were installed

the correct holes

) Be sure all leads are soldered t

the foil. Then set the circui
board aside until it is called f

later

.

FINIS

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PICTORIAL 1-3

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PARTS LIS

Unpack the package marked 2 and check eac

part against the following Parts List. The nu

bers in parentheses are keyed to the numbers on

the Power Supply Circuit Board Parts Pictorial.

PARTS
Per Kit

RESISTORS

DESCRIPTI

ON

T

Any part that is packaged in an individual en

h

m

velope with a part number on it, should be place

back in its envelope after it is identified, un

that part is called for in a step.

DESCRIPTION

it

DIODE

PARTS
Per K

S

d

til

1/2 Wat

(1)1-49

1-6
1-1

1-109

1-6

Other Resistors

(2)1-57-1 1

(3)1-25-2
(4)3-19-5

CAPACITOR

(5)27-6

(6)25-146

(7)25-172i

25-1731

HKATHKIT "

t

6
1

5

1
1

0

2

1

(8)56-4

22 2 (red-red-black

150 2 (brown-green-brown)(10)57-4

1500 2 (brown-green-red)
12 k2 (brown-red-orange)
51 k2 (green-brown-orange)

5600 2 1 watt (green-blue-vl2) 417-203

red

)

43 2 2 watt (yellow-orange-

black

)

330 2 5 wat

S

.22 (0.22) juF Myla
100 juF electrolytic,30V

100 juF electrolytic,70
500 juF electrolytic,75V

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9)57-27

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^NSISTORS-CONNECTOR PIN

-

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ITEMS FROM PACK 5

85-207-

1

1

5

1

Zener, 27 V

Silicon, 750 milliampere

S

ilicon, 3 ampere

S

S2091

TA731

Connector pin (1 extra)

Power supply circuit boar

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Page 17

START

(/)/5600 fi (green-blue-red) 1 watt.

(./ ,22 n (red-red-black)

.

CONTINU

NOTE: When mounting the electr
lytic capacitors in the following
steps, always match the positiv
(+) mark on the capacitor with th

pos

itive (+)' mark on the circuit

board

.

( A 100

(f/^ 500 pF electrolytic.

( ) 330 fl 5 watt. Place a 3/8"

pF 30 V electrolytic

100 ^F 70 V electrolytic

length of small sleeving on eac
lead. Then install the resistor
solder the lead to the foil, and
cut off the excess lead lengths.

E

.

.

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e

h

,

( \i 1500 ^ (brown-green-red).

/< 43 n (yellow-orange-black)

I watt.

)^ .22 (0.22) pF Mylar.

(/) .22 (0.22) pF Mylar.

( ) Solder all leads to the foil and

cut off the excess lead lengths

2

.

3/8" SMAL

SLEEVIN

(\ ) 51 kfi (green-brown-orange).

(J ) 12 kfl (brown-red-orange)

( ) 150 Cl (brown-green-brown).

( ) Recheck the three electrolytic

( ) Solder all leads to the foil and

( ) Carefully inspect the foil side o

G

.

capacitors to make sure the
pos

itive (+) ends are positione

correctly

cut off the excess lead lengths.

the circuit board and solder an
connections that might have

been missed. Then set this cir
cuit board aside temporarily

.

d

f

y

.

PICTORIAL 2-2

FINIS

H

8

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n

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i

a

o

i

o

i

d

s

i

a

v

d

m

u

n

d

w

v

u

3

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d

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l

i

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P

O

WER A

M

P

LIFIE

R

CIR

C

UIT B

O

A

R

PARTS LIS

Unpack the package marked 3 and check each
part against the following Parts List. The nu

bers in parentheses are keyed to the numbers

the Power Amplifier Circuit Board Parts Pic

PAR

T

No.

RESISTORS
1/2 Wat

(1)1-12

(2)4-16

(3)1-1-

(4)3-24-5

9

1-3
1-4

2

1-4

1-9
1-1

6

1-2

0

1/2 Wat

4-17

4-18

4-2

6

4-3

0

4-3

1

Other Resis

1

3-7-5

PARTS

Per Kit

t

5% Lo

t

^

1

/

i
i

i
<

Z

t

ors

i

DESCRIPTION

4.7 ft (yellow-violet-gold)
100 ft (brown-black-brown
270 ft (red-violet-brown)

330 ft (orange-orange-

brown

)

1000 ft (brown-black-red)

4700 ft (yellow-violet-red)

10 kft (brown-black-orange)

-Nois

w

e

1800 ft (brown-gray-red
2200 ft (red-red-red)
3300 ft (orange-orange-red

33 kft (orange-orange-

orange

270 kft (red-violet-yellow

330 kft (orange-orange

yellow)

470 ^^ 1 watt (yellow-violet­brown

.67 ft 5 watt
11 ft 5 watt

)

)

D

-

S

m

on

)

(10)25-12

)

)

(11)417-118

(12)417-136

)

(13)417-137
(14) 56-4

(15)259-2

T

torial. Any part that is packaged in an individua

envelope with a part number on it, should b

placed back in its envelope after it is identified
until that part is called for in a step

T

PARTS

Per Kit

PAR

No.

CAPACITORS

(5)21-149

21-

17

21-14

(6)20-13

(7)27-4

(8) 25-18

(9)25-220

9

7

0

6

25-15

3

25-175

TRANSISTOR$-DIODES-CONNECTOR PINS

417-13

ITEMS FROM PACK 5

85-164-

8

4

0

3

DESCRIPTION

/

2.7 pF disc
270 pF disc
.001 jF dis

330 pF silver mic
.1 juF Myla

2.2 juF electrolyti
(may be marked 2R2)

10 juF tantalum
50 jiF electrolytic
100 ^F electrolytic

250 /xF electrolytic

2N3393 transistor
40408transisto
40409transistor
40410transisto

Zener diod

C

onnector pi

Power amplifier circuit

board

.

c

a

r

c

r

r

e

n

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e

,

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uoixisod 'sdaxs xxau aqx ui sapoip

aqX "uAioqs SB pua apoqpjo aqx

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Page 21

START

NOTE: Before installing the nex

t

wo transistors, turn them over an

check the B andE leads to make sur

they are not touching the metal hea

sink. Then install them in the follow
ing manner, as shown. First line up
the locating tab of the transistor with
the outline of the tab on the circui
board. Then insert the transistor
leads into their correct holes whic
are indicated by C, B, andE. Push
the heat sink pins into the circui
board. Then solder the pins and
transistor leads to the foil. Clip
off the excess transistor leads.

MAKE SURE

PINS AR

H

IMP

O

THE

S

LEA

D

NOT

M

E

L

OCATI

TAB

HEA

T

P

I

HOL

(/) (vi 40410 transistor (Par

/ \j #417-138) at Q205.

(/) (^) 40409 transistor (Part

#417-137) at Q204

.

CONTINU

t
d
e

t

t

h

t

E

T

t

NOTE: Install the next two tra
sistors in the following manner, as

s

hown: First line up the flat of the
transistor with the outline of th
flat on the circuit board. The
insert the transistor leads into thei
correct holes, which are indicated
by C, B, and E. Position the tran
sistor 1/4" away from the circuit

board. Then solder each lead t
the foil and clip off the excess lead
lengths.

transistors (Part

8) atQ201 andQ202
transistor 4040

417-136) at Q203 in

owing manner, a

First line up the

tab of the transi

the outline of th

the circuit board.
sert the transistor
nto their correc

hich are indicate

B, and E. Positio

sistor 1/4" awa

circuit board. So

lead to the foil an
the excess lead

TIN

B

E

n

e
n
r

o

.

8

s

s

e

t
d
n
y

l

d

PICTORIAL 3-2

y inspect the foil

the circuit board
er any connection
ht have been miss

PROCEED TO PICTORIAL 3-3.

s

N

s

•pjBO

q

aqx uo ^^Btu (+) aAixisod

-0JX03X3 ^m 3utxunoui uaqAV :aXO
Suimoxxoj aqx ut saoxioBdBO oix^X

aAixisod aqx qoxBui s^baixb 'sdax
aqx qxi^ aoxiOBdBO aqx no pua (+)

9 O U

^

^

y\j ^./

^^9

*

)

0

9

(/\

)

)

)

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00X (^ ) (r

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S O IT (

srqj junoj\[ -umiBjuEj ^rf QT ( ) L.

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aqxqsnd'UMoqss^ ^x P11^

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0

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^

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MPLIFIE

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CIR

PAR

No.

RESISTORS

1/2 Watt 5% LoW-Noise

(1)4-53

4-1

4

4-1

5

4-4

1

4-1

8

4

-

19

4-2

0

4-5

4

4-2

2

4-2

3

4-2

5

4-2

7

4

-34

4-2

9

4-3

2

T

C

UIT B

PARTS
Per Kit

O

A

R

D

PARTS LIS

Unpack the package marked 4 and check each par
against the following Parts List. The numbers i

parentheses are keyed to the numbers on the Con

trol Preamplifier Circuit Board Parts Pictorial

DESCRIPTION

270 2 (red-violet-brown
620 2 (blue-red-brown
1000 2 (brown-black-red
1500 2 (brown-green-red
3300 2 (orange-orange-red
3900 2 (orange-white-red)
4700 2 (yellow-violet-red)

5600 2 (green-blue-red

10 k2 (brown-black-orange
22 k2 (red-red-orange)
27 k2 (red-violet-orange
47 k2 (yellow-violet
orange
100 k2 (brown-black
yellow
220 k2 (red-red-yellow

390 k2 (orange-white-

yellow)

)

)

)

)

)

)

)

-

-

)

T

t

n

.

T

6

PARTS
Per Kit

^2/

DESCRIPTI

)

^ 100 juF electrolytic,

100 nF electrolytic,

ON

PAR

No.

Capacitors (cond.
(3) 25-54 \^y^ 10 fiF electrolytic
(4)25-5

(5)25-146 ^^

(6)25-199 >1^ 500 jiF electrolyti

)

)

)

V

1

0

V

3

0

c

CAPACITOR

(2)27-7

0

27-73

27-47

27-61

HKATHKIT*

S

i

t

2

•

.0022 juF Mylar
.047 juF Myla
.1 (0.1) juF Myla
.47 (0.47) JJ.F Myla

r

r

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3

1

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ui UA^oqs se jaquinu jJBd aqj qjiM.

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aqj uo dajs qoiea ajaidtuoo uaqx *3utavb^p uotj

M

aq oj pxeoq jtnono aqj

q jinojio aqj jo uoijjod e Ajuo :3X0

si po

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o ^8JB aqj s/woqs iBuojoi^ qoi^a jo doj aqj ye

j

Page 25

START

(^/3300 12 (orange-orange-red)

<y) 8300 12 (orange-orange-red)

100 k!2

("1^100 k!2 (brown-black-yellow)

r )/3900 12 (orange-white-red).

3900 12 (orange-white-red)

( ^solder all leads to the foil a

(^it off the excess lead lengths.

(v/) 390 k!2 (orange-white-yellow).

I '^/390 k!2 (orange-white-yellow).

(brown-black-yellow).

.

.

.

nd

IDENTIFICATIO

DRAWING

PART NUMBER ~

N

: O

~

o

A

o

O

.

o

^ ) 27^cl2 (red-violet-orange)

(red-violet-orange).

1500 12 (brown-green-red).

(\>) 6lO 12 (red-violet-brown).

1500 12 (brown-green-red)

Solder all leads to the foil an

^dA off the excess lead lengths.

( ) 1Q0

( ) 15OO^^2 (brown-green-red).

(V) 220 k!2 (red-red-yellow).

( ) Solder all leads to the foil an

k!2 (brown-black-yellow)

100 k!2 (brown-black-yellow).

27 k!2 (red-violet-orange).

220 k!2 (red-red-yellow).

27 k!2 (red-violet-orange)

12 (brown-green-red).

cut off the excess lead lengths

.

.

.

d

.

d

.

PROCEED TO PICTORIAL 4-2

.

PICTORIAL 4-1

START

('^) 5600 fi (green-blue-red)

Page 27

O

IDENTIFICATIO

DRAWI

NG

N

O
O

I

PART NUMBER-^

O

.

22 k^ (red-red-orange)

1,000 Q (brown-black-red)

m ^500 ^^ (brown-green-red)

47 k^ (yellow-violet-orange).

47 k^ (yellow-violet-orange).

( y) 1000 n (brown-black-red)

( ) Solder all leads to the foil and

cut off the excess lead lengths.

kD (brown-black-orange).

~^i 10 kD (brown-black-orange).

(-y 10 k^^ (brown-black-orange).

(brown-black-orange).

( ) 10 kfl (brown-black-orange).

( ) Solder all leads to the foi

and cut off the excess lead
lengths

.

^700 n (yellow-violet-red).

.

.

.

.

l

M 10 kfi (brown-black-orange).

( )/47 k^ (yellow-violet-orange)

K)y27 kD (red-violet-orange)

47 kD (yellow-violet-orange)
1000 n ^brown-black-red).

( -f^Solder all leads to the foil and

cut off the excess lead lengths

PROCEED TO PICTORIAL 4-4

.

.

.

.

.

PICTORIAL 4-3

Page 29

START

NOTE: Install the transistors in th
following manner, as shown: Firs
line up the flat of the transistor with
the outline of the flat on the circuit
board. Then insert the transistor
leads into their correct holes, which

are indicated by C, B, and E. Posi

tion the transistors 1/4" away fro
the circuit board. Then solder each
lead to the foil and cut off the exces
lead lengths.

Install TZ1160 transistors (Part #417-218)
the following locations

( ^j TZ1160 transistor at Q102R.
(V^TZ1160 transistor at Q101R

:

.

IDENTIFICATIO

DRAWING

e

t

m

s

a

TZ 1160 transistor at Q102L.

TZ1160 transistor at Q101L.

( ) Recheck the four transisto

that were just installed to mak
sure the leads are in the corre
holes

.

PROCEED TO PICTORIAL 4-6

r

c

.

PICTORIAL 4-5

O

S

T

I

^

^Z.Z^XX ^.'VIKZ

]

]

x

)

V

i

x

a

v

i

s

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y

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: O

o
o

o

y

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o

N

xx

1

X

L

X

u uaq^ :aiO

^

3 AlllSOd

CN3 '

•oxxAxouxoaxa art 0

•oxxAxomoaia ^t1 0

•jeiAxv[ rt 22OO"'/ (s~-)

•uexA]/^ Tl 2200'

( )

oxxAxoJxoaxa 3uxxunox

-xsod aqx qox^xu sAeaxxe 'saoxxoEdEO
qXT^ aoxxoEd^o aqx uo pua (+) ba
xxnojxo aqx uo xpExu (+) aAxxxsod aq

puE xtoj aqx ox sp^ax he aapjog
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"oxxAxouxoaxa rl 00S

/

(y)

X

X

"oxxAxouxoaxa a7^ OX

'oxxAxouxoap Ti O

"oxxAxoaxoaia a^ O

P

1
g

'

/(A.)

1

^

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1

X
g

1 )

o

^

j

)

•oxxAxo^xoata ^ri 0
puE xxoj aqx ox spEax II^ aapxo

•sqxSuax p^ax ssaoxa aqx jjo xtxo

•I^^ d^^ 2200

^eiAx\[ ^rl 2200'

"A 0E 'oxxAxoaxoaia an 00
"A 01 'oxxAxoaxoaxa a1^ 00

"A~0X 'oxxAxouxoaia ri oO

puE |xoj aqx ox spEax \\e aapxo

•sqxSuax pEa| ssaaxa aqx jjo xn

-DEdEO otxAxoJxoaia aqx ^paqoaj
aAixisod aqx a.xns aipui ox sjoxx

-Xoauuoopauoixxsoda^E spua (+

9-^

'i-^ ivmoxoid 01 aaaooHd

^

START

Page 31

) 10 /iF electrolytic

(A >0 (iF electrolytic.

047 pF Mylar

.

,047 ii F Mylar.

1

0

electrolytic.

>^ yt7 /iF Mylar

( ^ 10 pF electrolytic

( ) Solder all leads to the foil an

cut off the excess lead lengths.

electrolytic

10 /iF electrolytic.

'

I

Mylar

( •-•')

( A 10 /iF electrolytic

(/) Solder all leads to the foil and

/iF Mylar

.

47 /iF Mylar

/iF electrolytic

cut off the excess lead lengths.

.

.

.

.

.

.

.

.

.

.

d

( ) Recheck the electrolytic capac

itors to make sure the positiv
(+) ends are positioned correc

ly.

PROCEED TO PAGE 32.

e

t

PICTORIAL 4-7

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i

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A

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spua aq; JBau si a;B;duia; aq; aan

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aq; qsnd ^jt^ 'itoj 9q; o; ;oj;uoo

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3;b;o.i ;ou oa :X

Page 33

E

R

Detail 4-8C

Refer to Detail 4-8C for the following steps.

Position the control preamplifier circu

board so that switch #63-479 is positioned a

shown in Detail 4-8C.

/

Mount the switch shaft assembly on th
board with the screws, spacers, lockwash
ers, and nuts

.

) Line up the lugs of the switch with the holes

in the circuit board. Then slide the switc
on the shaft and the lugs into their respective
holes. NOTE: It will be necessary to bend

the lugs out slightly to insert them into th

holes

.

Turn the circuit board over and solder the

leven lugs to the foil.

e

1"

•

V

0

I

i

I ^4 I

. i

2

"

3

,

"

I

Detail 4-8

D

NOTE: To install each of the next four controls,
insert the lugs and two mounting tabs firml
into the circuit board holes as shown in Deta

4-8D. Then turn the board over and twist th

two tabs 1/8 turn to hold the control in place.
Solder the lugs and tabs to the foil.

( )Installa

( )Install

( )Installa

it

s

(*)Installa

NOTE: To prepare a hookup wire, cut it to th

e

indicated length and strip 1/4" of insulation from

­each end

.

50k

a

50k^^dual control (#12-79).

dual control (#12-79).

25kf2dual control (#12-78).
25M2dual control (#12-77).

( ) Install a 2-1/4" black hookup wire on th

ircuit board near the rotary switch at th

h

c

location lettered WIRE. Solder both co
n

ections.

e

( ) C

onnect a 3-1/2" black hookup wire fro

lug 4 of 25 k^^ control#12-77 (S-l)to hole A
of the circuit board (S-l).

4

"

I

5

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C

H

A

SSIS

Unpack the package marked 5, which is all of th
remaining parts, and check each part against the
following Parts List. The numbers in parenthe
ses are keyed to the numbers on the Chassi

Parts Pictorial (fold-out from Page 37). An

PAR

T

No.

PARTS

Per Kit

DESCRIPTION

RESISTOR-CAPACITORS-CHOKES-

TRANSFORME

(1)1-1-

1

(2)21-14

21-31

(3)25-15

(4)45-5

25-171

9

54-18

6

1

?ME

j

470 SI 1 watt (yellow-violet- (10)60-31
brown
.001 ^F disc capacito

.02 juF disc capacitor

4000 fxF electrolytic

capacitor

8000 jLtF electrolyti

capacito

8.8 juH choke

Power transformer

)

c

r

PARTS LIS

e

part that is packaged in an individual envelope
with a part number on it, should be place
back in its envelope after it is identified, unti

s

that part is called for in a step.

y

PAR

T

N

o.

SWITCHES-CONROL

r

60-32

(11)65-2

1

SOCKETS-TERMINAL STRIPS-PHONE JACK5
FUSEHOLDE

T

PARTS
Per Kit

R

DESCRIPTION

S

Rocker switch (white)
Rocker switch (black)
Thermal switc

h

d

l

-

DIODES-TRANSISTORS-LAMPS-FUSE

NOTE: The diodes and transistors maybe mark- (13)434-8
ed with either the part number or the type num- (14) 434-H
ber

.

(5)56-3

3
(6)417-13
(7)417-20

(8)412-14

412-1
412-3

(9)421-

6

y

9

4

-

3

1N3754 diod
40411 transistor

TA7311 transistor

#44 lam

8

#47 lamp
#49 lamp (red
3 ampere slow-blow fuse (20) 436-27

(

e

p

)

(1 extra)

^

15) 434-147

(

(

(

(

(

16) 434-177

17) 431-3

18) 431-5

19) 431-7

21) 423-

434^21

2

5

7

9

5

2
1

Lamp socket
Lamp socket with lead
Transistor socket

AC socket

Phono socket stri

5-lug miniature termina
strip
4-lug terminal stri

6-lug screw-type terminal

strip

Phone jac
Fuseholde

k

r

s

p

l

p

35

9

8

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Page 38

STEP-BY-STEP ASSEMBLY

HEAT SINK PARTS MOUNTING

Refer to Pictorial 5-1 for the following steps

) Locate the following parts: tw^/fieat sink

with threaded holes (#215-22), tsvo heat sink
with slottedlioles (#215-23),'-four transistor
so^kets, f©^^^40411 tran^istors (#417-139),

^our mica/uisulatorSj^-iwo nybsn transistor

covers, ^ttfir 1/8" spacers, f^ur 6-32x1/2"

screws^iour 6-32 x 11/16" screws, and two
containers of silicone grease

vq/nea

.

E SPACE

t

J

/

.THREADED

NOTE: Four transistors will be mounted on th
heat sinks with insulators and sockets in the fol

.

=

lowing steps. As you mount each transistor, mak
sure the indicated wide space on the transistor,

transistor socket, and mica insulator is lined up

s

with the wide space on the heat sink. Also, make

s

sure the ridges on the socket seat properly in th

heat sink mounting holes before tightening th

screws. See Pictorial 5-1.

7

) Inspect the transistors. If the leads ar

bent, straighten them so they are perpen-

icular with the transistor body.

pply a layer of silicone grease on both

sides of four mica insulators with the tip of

your finger. Important: Use 1/2 of a contai

er for each insulator. Then place the insu
lators on the transistors. The inset drawin
on Pictorial 5-1 shows a good way to remove
the s

ilicone grease from the container.

f) Place both threaded-hole heat sinks (#215

22) o

n your work surface with the flang

positioned up as shown. Then mount a 4041

transistor, a mica insulator, and a transis

tor socket on each heat sink. Use 6-32 x 1/2

screws.

Bend the lugs of the transistor sockets at a

45 degree angle as shown.

e

e

e

e

e

n

g

­e

1

"

PICTORIAL 5-1

r

SPACE

PLY SILICON

ASE ON BOTH

E

E

S

Set the completed heat sinks aside tempo

arily

E

Refer to Detail 5-2A for the following steps.

( •) Place the remaining two heat sinks on you

.

work surface with the flange positioned up

Then mount a nylon transistor cover,

40411 transistor, a mica insulator, and a

transistor socket on each heat sink. Us

6-32 x 11/16" screws and 1/8" spacers

IMPORTANT: Be sure to tighten the 6-32 x

11/16" screws securely to force the 1/8"

spacers into the nylon transistor covers

and seat them against the transistor case

Good electrical contact between these parts

is essential for proper circuit operation.

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(SN)8 P^^ (X-S) X s3rq uaaMjaq a^iM U8/8"X (-)

'Da J

j

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o

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*oa j

ff

8 pub (x-g) X sSnx uaa^jaq aaiA^ U8/8"X I

o

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X

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o

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q

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)

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(SN) S Pu^ (Z"S) 8 s^nX u

)

jo (SN) L Pu^ (Z-S) S sSnx uaa^ja

6 P^^^ (Z"S) L sSnx u

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n

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l

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O

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0

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..9

'

r

..9

XBATHKIT

CHASSIS BASE PARTS MOUNTING

Refer to Pictorial 5-4 (fold-out from Page'38)
for the following steps.

(—7 Locate the chassis base and position it on

your work surface as shown.

/8" SCRE

Page 43

W

{/) Install rubber grommets in holes CA and

GET. CA is located in front of the chassis

(•") Install jiylon insulators atholesCG, CH, CJ,

CK,-CP, and CR from the bottom of the cha

sis. Use a pair of pliers as shown in Detail

5-4A.

B ) PULL SQUEEZED EN

INTO HOLE UNTI L
INSULATOR SEATS

AND INSERT I
IN HOLE

ULATO

D O

PROPERL

F

R

T

Y

s

D

4-LUG

.

i #6 LOCKWASHER

TOP O

F

CHASSIS

|S>#6 LOCKWASHE

6-32 NUT

TERMINA

L

STRIP

R

Detail 5-4B

32 x 3/8"

SCREW

Detail 5-4A

nt a 4-lug terminal strip at CS. Use a
6-32 x 3/8" screw, two #6 lockwashers,
and a 6-32 nut. Refer to Detail 5-4B

( ^7 Bend lugs 2 and 3 down against the termina

/^trip as shown. These lugs are not used.

Mount 1-9/32" long round spacers at CX an

CY with 6-32 x 3/8" screws. Refer to Detail

5^4C.

Similarly, mount 11/16" long spacers atCB

CC, and CD with 6-32 x 3/8" screws.

.

l

d

LONG ROUN

SPACE

R

\

D

OUTSIDE O

FLANG

F

E

Detail 5-4C

,

ioa

3 A111 SO

d

lfl

N

H

)

x J9J9

sduiBjo

^7/

•sdgxs Sutavoxxoj gqx

v

.

b jo gdBqs gqx ui duiBjo aoxjo^dBO gqx pugg (r\

q

D

U 3tW uop^T^ Tu

gqx xunoj\[ '(uiaoj b sb aoxto^dBO gqx asn)

28-9 pub sjgqsBA^qoox g# qxp^ I

•guitx siqx x^ SP

H

ox JOJ9

'-S I

PP

d

noat '

ogqxjopug siqx 'osx

"sxnu gqx

gq^ joj a^-"S

noui JoxiOBdBO gqx

W

3

O

OOf' Pu^ duiBXO ^gqxo gqx xu

sb si Snx pg^jBui gqx os aoxpi3dBO gqx

ugAggqpxnoqs aoxiOBdB

Xou oa ".lOXP'BdBO jgqxo gqx jo pug gqx qxpv\

puB duiBio SuTxu

0009'

^

d 0

00

^

pu

n

jj,,x

x

o

g 'duiBjo gqx ag

'STSSBqo gqx dJBM. puB uigqx

gqx jo pug gqj uoixTSO

-OTguxuAvoqs SBduiBXO9qxtuo
gqx os aoxiOBdBO gqx uanx ugqx '^-q

-isod st Snj pg^aBUi-gATXTSod ao xop

qx uo sxnu gqx ugxqSix ^Oj^ *uM.oqs sb pguoi

g
oxaABq sxnu gsgqj, :aX0N 'duiBj

ugxqSxx^gAO ox gxqissod si XT pq

J

#

b

oqs SB duiBp gq^ uotxtsOc

•gunx siqx ^ s.9Jos gqx

gqx uo ^gaos u9I/XT x 28-9 ^ XPlsuj

u gg-9 puB J9qsBA\:pox g#

"9UIT} STl^^ ^-B M.9J0S

uo ^T xunora puB i^

'SM.9J0S ,,8/8 x 88 ~9 ^^-im ^i^ stssBqo gq^

Xou o

a *s^nu 28"9 PUB 'sjgqsBAVjpox g

xou oa *p

Detail 5-4F

Page 45

T

R

Detail 5-5A

Refer to Detail 5-4F for the following steps.

( ) Push the 8000 ^ F capacitor inside the clamp.

Position the capacitor 1-1/4" from the bo

tom of the chassis as shown in the inset
drawing on Detail 5-4F. Then turn the capac

itor so the positive (+) marked lug is posi
t

ioned as shown. Now tighten the 6-32 x

16" screw

hten the three capacitor clamp screws

.

Refer to Pictorial 5-5 (fold-out from Page 38

for the following steps.

Position th
s

hown. Thenfasten the left apron to th

echassis and left apron a

chassis withfour #6 x 1/4" sheet metal

screws.

Fasten the right apron to the chassis with
t^ree #6 x 1/4" sheet metal screws.

^5 Position the rear apron as shown and fasten

t

.

it to chassis spacers CX and CYwith 6-32 x

'3/8" screws.

r

) Fasten the left and right aprons to the rea

apron with six #6 x 1/4" sheet metal screws.

Install 6-32 speednuts on the left and right

aprons at holes DA, DB, DC, and DD. Mak

r

e

sure the speednuts are positioned with the

flat side

)

s

e

Then push the speednuts over the apron

flanges.

Position the transformer support bracket as

shown and mount it on the right apron. Use
8-32 x 1/4" screws, #8 lockwashers, a

8-32 nuts as shown in Detail 5-5A.

up as shown in the inset drawing.

nd

9X-

SISSV

H

O

j
j

j

•sdajs Sui^oxioj aqj jo

•iiAvoqs sb aoBja

jno-pxoj) 9-g x^I-iojoid oj jaja^

uo AjquiassB sissBqo aq

j^^oai anoA

B

uoo aq

j

n

'

uuoD aaojaa :3^ON 'sdajs Si

•sdajs Sutavoxioj aqj ux pajoau

ut saax/A AjquiassB axqBa aq

ij jaqjaSoj spuBJjs aqj jsiavj

sjno^Baaq SuiuiBinaa aqj jb S3atai aqj ajnon j(\ )

saJTM asaqx 'uAioqs sb AxajBtuixojdd

papuBJjs b Sujjoa

apis uiojjoq aqj uo sSnj uapxos g aa jqj junoj\[ ( )

o

# 'Aiaaos

a

s

o

j

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D ^^ sissBqo aqj j

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j

o x

dijjs

papuBJjs ^jOBxq pub aatM pijos J^OBxa i^)

*(Z-S) aa ^T^JS XT3intu.iaj jo g Snr/

)

•(i-s

)

djajs x^uxui^.a\ jo g Snx oj aaiM. anxa (/•

S

(

)

a

^

M

9

#

M3HSVM)I3O1

V9-S

M

)

)

qa^a jb sa^tA^ aqj

qo aqj uo Ajquiass-e ajq^o aqj

^

i

aaq j^ saai^ aqj jaasu

a

D ^ao^ds jo

^

ajq aaqjo

j

•sissBqa aq

-uiassB axqBO jaijixduiB aaAvod aqj ajBoo^ (

AxqtuassB aqj pjojun "(ZLl'tZW

aqj ut STSS^

6# pu^ 'g^ 'g# jno

•stss^qo aqj jo apis aaqjo aqj oj qSno^qj

jjaj aqj oj pauoijisod aq pjnoqs g^ jno^feaa

aqj jo ivs aj^oox \i\^ sxqx 'A

uosuOTjTsodjoaaaoo Jtaqjut sjno

u

j

)

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•(i-s) aa

a

j

x

'SUOT

l

n

O

papuBJjs

jo ^ Snx oj

•(i-s) aa

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\^m

w

ud^ jo g Snj oj ajj

papuBjjs anxq-ajtq^ i—)

papuBajs

-tuiaaj jo g Snj oj

"(i-s) aa

-

uod aaaAv jBqj s^jiav aqj jo xi^ J^oaqo avo^i (r)

oj Qa djjjs x^ujtu-^aj jo sSnj aqj oj pajoau

Sinqonoj aaB spuBajs aqj jo auou aans aj^Bi

ja^^oos jo x S^x I aJtI^ 9niq-5i0Bxq-ajiqA\.\

jaj^oos jo x Sn\ puB aa ja^oos jo g Snx puaa (/^)

-jjOBxq-ajiqAvaqj jaauuoouaqx 'UAioqs sb a

Abiu noA) x Snx oj g Snx qSnojqj aaiAV

-nsui jo ,,^/x X^UOIIIPP^ U^ OAOiuaa o

-oa

uuoo qjoq aapxog '(ajiM. aqj iuojj uoijb

jo Snx (+) aAijisod aqj oj aaiM. papuBjjs pa

"(SN) H

j

qSnoaqj QI# jno^Baaq jb saaiAi aqj jaasu

uaaaS-ABJtS-ajiqAi aqx

pajoauuoo aq

Page 47

Breakout #

Yellow wire and white-black-blue wire to

\

4

lug 2 of socket BF (NS)

(i/J White-black-violet wire to lug 1 of socke

^G (NS)

(A Orange wire through lug 2 of socket B

to lug 1 of fuseholder BH (you may hav
to remove an additional 1/4" of insulatio
from the wire). Solder both lugs.

( ) Place either power amplifier circuit board

on the left side of the chassis as shown. This

will now be the left channel power amplifie

will be mountedtcrthirchassis after theybotj

Connect the wires from the cable assembly to the
left channel power amplifier circuit board in th

following steps. After insta

the circuit board over and solder it to the foil
Then cut off the excess lead lengths

9

.

.

circuit board. NOTE: This cir^uit hoard a

• amplifier circuit board

lling each wire, tur

.

q

nd

Breakout #2
(A Orange stranded wire to hole 10 (S-l).

( ^ Gray wire to hole 9 (S-l)
(A Brown wire to hole 4 (S-l)

t

G

e

n

r

^

i

e

n

.

White-black stranded wire to hole 8 (S-l)

the remaining power amplifier circu

board on the chassis beside the left channel

power amplifier board. This board will no

be the right channel power amplifier circuit

board

.

Connect the remaining wires from breakout #2

to the right channel power amplifier circuit board

in the following steps.

(/) White-brown stranded wire to hole 7 (S-l).
( ^ White-gray wire to hole 13 (S-l).

C) Black wire to hole 12 (S-l).

(-^/White-blue wire to hole 11 (S-l).
(A White-yellow wire to hole 6 (S-l).

.

.

.

it

w

Breakout #
(^Brown stranded wire to hole 7 (S-l)

(/Gray wire to hole 13 (S-l).

^/slack wire to hole 12 (S-l).

("0 Blue wire to hole 11 (S-l).

(A^ellow wire to hole 6 (S-l)

(/ Orange wire to hole 5 (S-l)

(A Red wire to hole 2 (S-l)

( ) Green wire to hole 3 (S-l)

1

.

.

.

.

(A White-orange wire to hole 5 (S-l)

.

White-red wire to hole 2 (S-l).

(A White-green wire to hole 3 (S-l)

A

Breakout #5

White-orange stranded wire to hole 10 (S-l)

(•*)/White stranded wire to hole 8 (S-l).
( ^),White-gray wire to hole 9 (S-l).

(A White-brown wire to hole 4 (S-l)
( J) Connect the two white-black stranded wires

to solder lug 1 at CT (NS).

( ) Connect the two black stranded wires to so

der lug 2 at CT (NS).

.

.

.

.

l

8

^

) papuBj^s jo sqjSuaj Sutavoijoj aqj aaBdaj^ ( )

uo

o

)

paa i

t

^

:;

s
o

'aai^

uoo ( ^)

o

.odjjaxaqj jo f^x ^Ojoauuo

aqj oj aji^ b Suijoauuoo uaq

'dajs jxau aqj ut sb 'sjojoauuoo pJtBoq

aqjojui ajT/w aqj jaasux 'AxjqStj aaqjaSoj spuBJj

naaojaq aojoauuoo aqj jBaqaa oj Ajbs

puBJjs JioBjq ,,2/X-8 ^ joau

-saoau aq Aboi ji *jt ^apjos uaqj puB 'aojoauuo

uiojj a^i^ pa

q

q

q

m

ssttu uaaq aAB

aq^ uo spaBo

^

aq^ jo ^7! Jcqoau

Japps o^ (x~s

uoo Aub japps pub spjBo

I

D

p

qjo apxsiTOj aq^ pads

aq^ ua^SBj uaq^ "pa

uiojj aaiM. papuB^
;moai

o

^noaioq

}qiui ^Bq^ suo^oau

aapjos oj (X~S) P-i^oq jino

"a9-S n^J3Q UI UM.oqs sb s^jim. aqj ajnog (r ) *(S"S)

99-S I.ID13

;/l A

0

..g

,,9

Page 49

Refer to Part A of Detail 5-6C for the followin

steps

.

(J) Locate the power supply circuit board and

/position it as shown.

Connect a 3" black stranded wire to hole 1

(S-l)

.

Connect a 4-1/2" black stranded wire to

J

hole 18 (S-l)

.

g

Connect a 4" red stranded wire to hole 16

(S-l)

.

Refer to Part B of Detail 5-6C for the following

steps

.

7

Locate the TA7311 transistor (#417-203)
Twist the ends of the outer two lugs 1/4 turn

as shown in the inset drawing on Detail 5- 6C.

(1/) Note the location of holes 8, 9, and 10 o

the circuit board. Then turn the board over

Position the transistor with the flat side a

shown and insert the outer leads into holes
9 and 10 and the center lead into hole 8

Push the leads into the holes (they should

rotrude through the other side approxi

p

mately 1/16"); then solder all three conne

tions

.

Refer to Pictorial 5-6 (fold-out from this page)

for tl^Jollowing steps.

( v) Place the circuit board on the chassis as

shown. Make sure the transistor is ben
out from underneath the circuit board

.

n

.

s

.

c

t
.

Detail 5-6C

D

C

onnect the remaining wires from breakout #5

to the power supply circuit board in the followin

stens

.

{/) Violet wire to hole 15 (S-l).

Brown wire to hole 4 (S-l).

Red wire to connector 11 (S-l)

.

(^) White-red wire to connector 12 (S-l).

( ) C

onnect the white-gray-green wire from

breakout #8 to connector 14 (S-l).

The free ends of the two black wires and one re

wire coming from the power supply circuit board

will be c

onnected later

Temporarily fasten the circuit board to on

.

nylon insulator with a 6-32 x 3/4" self-

tapping screw. It is not necessary to tighte
the screw

.

g

d

e

n

0

8

o

j

'sdajs Sutmoj

c

-joj aqj joj i-

aaqj ujnx (r )

dpuB

j

~

•uAioqs sb a ob

'(68-ST7^)

jasut aqj ut UAioqs sb

uo

N

aaau jou si

i

n

o
a

)

i

uuoo j(\ )

i

ubo jBqj aqoq

'uoijaauuo

dijjs j^uiu

nj oj (sm) S3 dtjjs jbutu

j3ao AjquiassBSissBq

-jns i^JOM. jnoAuo jiuoijiso

sa^oqa ^^rt 8"8 ixjoq ajBaoq L

spBaj aqj aJBdaj^

Ji 'sa^joqa aqj Sujxibjsui uaq^v : 3XO

spBaj aqj puaq oj AjBSs

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•uAioqs sb a^oqa aqj uoijiso^ '(X^S) 33

•raaqj uo pajunoui sjojstsubjj aqj

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•u/Aoqs sb aqoqa aqj uojjisoa: "(X"S)

)

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jo xi^ oobjcJ "6# jno^Ba^q jb uojcIb jb^j aqj

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,,8/E x 28 "9

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Page 51

Connect the wires from breakout #9 to socket HE in the

ollowing steps. Route the wires as shown

f

(-0 White stranded wire to lug 3 of HE (S-l).

( -^ White-gray wire to lug 2 of HE (S-l).

(^0 White-black stranded wire to lug 1 of HE (S-l)

(-"^Position one of the two remaining heat sinks in front of

the rear apron at breakout #6.

Prepare both ends of a 2-1/2" red stranded wire.
Remove 1/4" of insulation from both ends and twis
t

he strands of wire together. Then connect the wir

from lug 3 of socket HC (NS) to lug

switch HD (NS)

Connect the wires from breakout #6 in the following steps

(^) BpaWn solid wire to lug 1 of terminal strip HB (S-2)

(<J) Green wire to lug 5 of terminal strip HB (S-2).

Violet wire and orange wire to lug 3 of socket HC
(S,-3).

Yellow wire to lug 2 of socket HC (S-l)

.

.

.

1 of thermal

.

.

POSITION WIRES

> IN THJS AREA^

L

UUULJfJUULJ

rnnr^

( ) Position the remaining heat sink in front of the rear

t

e

.

a

pron at breakout #9, observing the pr

preceding step.

Connect the wires from breakout #9 to the heat sink in th

following steps.

(S-2)

ite-green wire to lug 5 of terminal strip HF (S-2).

White-red stranded wire and white-orange wire to lug 3
of socket HG (S-2).

nnr

Detail 5-8A

e-brown solid wire to lug 1 of terminal strip H
.

n

nnr^nnn

r

ecautions in th

e

e

F

(\Jf Brown stranded wire to lug 1 of socket HC (S-l).

(^^ited stranded wire to lug 2 of thermal switch HD (NS).

a .02 ii¥ disc capacitor as shown between lu

2 of thermal switch HD (S-2) and the solder lug (S-l).

White-red stranded wire to lug 1 of thermal switch H

M ^

(S-2)

.

Carefully inspect all connections for loose wires o
unsoldered lugs. Remove any wire clippings or solder

splashes that may be lodged in the wiring.

Install this heat sink over the two screws. Make sure the
wires are positioned between the heat sinks as shown i

Detail 5-8A and then make the following precautionar
checks. Make sure the lugs of transistor HC do not

touch the lugs of transistor HC do not touch the lugs o

transistor HA. Also make sure the wires which are
connected to the terminal strip on the heat sink do not

touch the chassis

.

White-yellow wire to lug 2 of socket HG (S-l)

White-brown stranded wire to lug 1 of socket HG (S-l)

( <_)^-Either red stranded wire to lug 2 of thermal switch H

g

(NS).

D

r

n
y

f

Connect a .02 /iF disc capacitor as shown between lug 2
of thermal switch HH (S-2) and the solder lug (S-l).

( u)^Remaining red stranded wire to lug 1 of thermal switc

HH (S-l).

((-)—Carefully inspect all connections for loose wire or

unsoldered lugs. Remove any wire clippings or solder
splashes that may be lodged in the wiring.

the heat sink over the two screws. Make sure the

wires are positioned between the heat sinks as shown in

Detail 5-8A. Also make sure the lugs of transistor HG
do not touch the lugs of transistor HE. Then tighte

the screws.

.

.

H

h

n

^

9

OH

d

i

^31 JI3dWV3dd ON

v6-s

V

6"9

)

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x

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x

i

,

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q papBa

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T

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uuo

-un aqx qxTAi sx^^^^jq ajSuB aqx uoixisog (/

uaqx 'IT'e^
Xinojio aqx jo apis jioj aqx ox uiaqx xnnou

anoj 'sAiaaos t^^/\
ajjBj^ 'sxn

o

*(T"S) aa ^I^s x^^^os ouoqd

(x^uta) xX'B^us jo qxSuaj ,,

aqx uaqM uanx

qd aqx jo x 3Xoq }

q

uojdB JB3J aqx uo pjBoq xinojio aqx

j

aSBg uiojj xno-pjoj) 6"9

s

)

sb XT uoixTsod puB punojB stssB

o

s

u saop japps aqx x^qT o

•pjBOq aqx jo

(/^

o

)

b

uoqd j

^oos o

•(i-s

"(T"S) DH ^TJ^s xa^pos ouoqd j

uiojj aaiM. dn^ooq ^oBjq ug

-aad ouoqd aqx ox saoxsisaj puB sajiAV aqx
'sdajs Suia^oxxoj aqx ui pxEoq ^xnoato

-Aaajs (x^uia) xx^uis jo qxSuaj ki^/\-\ b aoBXd

si qoiqA^ aoxstsaa aqx jo pua aa^j aqx uo Sui

jatjTXduiBaad ouoqd aqx jog ajoq oj pajoa

Snj oj pBaj siqx x39uuoo uaqx 'p^tBoq

si qoiqAv joxsisaj aqx jo pua aajj aqx uo Sut

aaijixduiBa^d ouo

o

; pBax siqx x3^^110^ U9

aqx ox sa-iiAi ^uiAvogoj aqx Sutaapxo
sissBqo aqx uoixisod'pjBoqxino.no aqx jo apis jio

aqx uaa^qaq avojj x

g ajoq ox (-g) og diaxs ^

C

onnect the white-gray-green wire comin

from breakout #3 of the cable assembly t
hole 5 (S-l).

("T Prepare the following lengths of hookup

let

r/2" white-violet

2" white-yello

w

ttl^white- orange
^^white-blu

5^- white-brown
1" white-blac

e

k

Locate the spiral shielding and large sleev

ing. Then prepare two cable assemblies a

shown in Detail 5-9B. Repeat steps A, B, C
and D twice; once for the solid color wire

d once for the striped color wires

ace both cable assemblies next to eac
other with the spiral shielding leads towar
the phono preamplifier circuit board as

shown in Pictorial 5-9. Place a plasti
clamp around the cables so that the sam

amount of sleeving protrudes from eithe

side of the clamp. Then m

on the left apron. Use a 6-32 x 3/8" screw
#6 lockwasher, and 6-32 nut

C

onnect the wires from the two cable assemblie

ount the clam

.

to the phono preamplifier circuit board in the
following steps

.

Page 53

g

o

Insert an 11" black hookup wire through the

plastic clamp. Connect one end of the wir

to hole C of the phono preamplifier circu
board (S-l). The other end of this wire a

the cable assemblies will be connected later

nd

e

it

.

Cut off the excess wire ends from the foil

si'de of the circuit board.

(A) CUT OFF A 7-1/2" LENGTH OF SPIRAL SHIELDING.

') UNWIND ONE END OF THE SHIELDING TO MAKE A 1-1/4"
^-y LEAD.

1-1/4" LEAD

s

,

s

.

h

IGRASP THE SOLID COLOR WIRES FIRMLY AT ONE END BE

TWEEN

YOUR THUMB AND FOREFINGER. THEN GRASP TH
WIRES WITH YOUR OTHER HAND AND PULL THEM THROUGH
SEVERAL TIMES. THIS WILL REMOVE ANY KINKS IN TH
WIRE AND ENABLE YOU TO PUSH THEM THROUGH THE
SPIRAL SHIELDING EASIER

7-1/2" SPIRAL SHIELDIN

.

G

E
E

d

(6) INSERT THE SIX WIRES THROUGH THE SPIRAL SHIELDING.
c
e
r

p

,

THEN PULL THEM THROUGH TO THE LENGTHS SHOWN. MEA
URE THE WIRES FROM THE INDICATED END OF THE SPIRA
SHIELDING

PLACE A 7-1/2" LENGTH OF THE LARGE SLEEVING OVER THE
SPIRAL SHIELDING.

.

-1/4" LEA

D

S

L

s

' ) Spiral shielding lead of the striped color

Vire assembly to hole D (S-l)

.

Spiral shielding lead of the solid color wir

assembly to hole A (S-l).

r) Brown wire to hole 2 (S-l)

.

White-brown wire to hole 4 (S-l).

( ) Route the remaining wires at this end of the

cable assembly along the left apron and
down through the chassis opening. They wil

be connected later. Proceed to the top of th
right-hand column.

e

.

-1/4" LEA

l

e

D

7-1/2" LARGE SLEEVI

2-3/4" WHT-BL
3-1/4" WHT-BL

-1/4" WHT-ORG

-1/4" WHT-BR

5-1/4" WHT-YE

" WHT-V IOL

Detail 5-9B

U
K

N
L

-

M

-IHM IOI/WH

aoi

o

S

O6-

S

aqj

•sdaj

s

"

R

)

"(I-S) D3 JO Z 3ni oj

ouoqd jo sSrq aqj oj jxau sajt^ asaqj ajnog <Y^) sb ji uoxjisod pub aaAO sissB

uAvoq

s

'

jjaj aqj aaAO saatM. jojoo padt^js aqj pj

aqj aijq^ ^bav aqj jo jno uiaqj ddd^ oj uoadB

s

JtojOD pgo

a

o

g ja^oos

aq aJB saaiM

aatAv aojoo pgos

•pajoauuoo Sm

ajq^a aqj luojj s

•sdajs SujA^onoj aqj ui ^

s

j

g ja^aos oj

•uAVoqs sb og djajs ja^oo

aqj uio^j saatM jojoo padiajs aq

oijoj aqj va g

a jo 01 Sni oj sal^

a JO 8 Snl OJ

•sdajs ^utm
'(I-S)a

'(I-S)a

(

i

"(I-S) Da jo 01 Sn^ oj aj

)

iiiA^ ^r

^

3 JO 9

"(I-S) Da Jo 8 Sn^ oj ajt

j

A

y\

)

a JO 9 ^til o

"(I-S) D

ir)

"(I-S) D3 Jo f 3ni oj

g

s

s^ gg di^js ja^ao

iiiM (r~)

Z

^ P

*(I-S)S

"(I-S)9S JO ^ ^ni oj aaxM.

•(I-S)H

ouoqd jo sSrq aqj oj jxau saaiAv asaqj ajno

Detail 5-1O

A

Ref^^r to Detail 5-10A for the following steps.
(•') Position the chassis with the front ^oward

ias shown

the wires from the two cable assem

blies t^ck out of the way

.

.

e wires from grommetCA along th

right apron.

Locate the control preamplifier circui

board. Route the cable assembly wires from

breakout #1 ar

board. Then insert the wires from breakou

ound toward the foil side of th

t

e

t

#2 through grommet CE. Now position the

board so the edge rests on top of the chassis
and the large control shafts rest o
work surface. This is a convenient position

e

for the board when connecting the followin

wiring.

n you

r

g

9

9

I

ojj

s aqx

q

)

^

o

m

)

)

oxx^a ( )

01 "9

JappsnoA uai^\\

9Q 'ITJ P-i^o

j

M

s

"sdaxs Siiimoip

aqXOXsaJi

oq

saop japp

x

"sdaxs ^uiavoxxoj aqx ui pj"e

aqx iuojj s^jim. joxoo padijxs aq

jaijixdiu^aad xojxuoo aqx ox

jioj aqx uaaMxaq m

( .)

o pip

"sdaxs ^uimoxxoj aqx ui pj^o

ox a jim uMojg (,^

"(I-S) 8 9IM

aqx uiojj s^jim Jop

Xinojio jaijixdureajd xojxuoo aqx ox

V

^ {^)

V

q ox aaiM aSu^Jo-axiq

/"(I-S) 01 9ioq ox aaiA

/'(IS) II 9Iq ox aJi

*(I-S) H ^io^ ox ^-1!^ AVOXXQ^-axT^A

"(I-S) 6 3P

"(I-S) f 9IM

M

(/^)

•(I-S) ZI 3ioq ox aaiAv arqq-axiq

*(I"S) I 9xoq ox aji

^ L-

)

(I-S) SI 3ioq ox aji^ pxoiA-a;iq

*

"(I-S) Z 9Iq ox aJiM qo^j& Jr^

aq

"(I-S) 81 3I0M ox aJiM X9I0JA ^\

x

x

Suiuioo ajiM dnqooq qo^p

9m J D 9IM ox durep o^s^xd aq

"(I-S) E 3IOM ox ajiav m

Xioj aqx uiojj spua bjiav ssaoxa aqx Jjo

•pj'Eoq xinojia aqx jo apis

aqx jo apis

jioj aqx uiojj spua bjim ssaoxa aqx jjo

O

lOl

d

01-9 IVIU

HB&A.'X'XXXEX'r

Page 57

Detail 5-10

Carefully inspect the foil side of the circuit

board for any solder bridges between foil
or unsoldered connections. Solder any co
nections that might

have been missed,

) Mount the circuit board to the three chassi

spacers as follows: Line up the three circuit
board holes with the three spacers. The

carefully push the board against the spacers
while folding the wires from the two cabl

assemblies neatly against the circuit board
Also make sure the control preamplifie

cable assembly rests on top of the chassi
and is not pinched between the board a
chassis. Then fasten the board to the

spacers with three 6-32 x 3/8" screws and
fiber washers as shown in Detail 5-1 OB

Refer to Detail 5-11A for the following steps

( ) Locate the rocker switch bracket, seve

rocker switches, two phone jacks, and the

front panel.

n

nd

B

Mount the black rocker switch at C with

s

s

n

4-40 x 1/4" screws. Turn the screws in al

the way, but do not tighten them

Mount six white rocker switches at the re
maining locations with 4-40 x 1/4" screws.
Turn the screws in all the way, but do no

tighten them

.

.

l

t

e

.

r

s

.

.

n

N

E

C

K

(••••) Position the switch bracket as shown. Moun

the phone jacks at A and B with control nuts.
Be sure to position the phone jacks with the

beveled corners as shown.

t

SCREW

Detail 5-11

A

89

N

J

.

S3H01IMS ^31N3O

l

811-9

S ON!N3dO N

g

)

^

*HTT "9 IT^aa

0^ ^9J3H "SAV3J0S ,,^/X X 28"9 qjTA

)

oj qojiAis qoBa ^oaqo

n

-g irejaa

j

i

O (a

)

s

B

pasn aq ijia^ ^aqj .'apxs

•uoijisod joajjoo aqj oj ji aAou

j

)

n

*ajiA\. d

Suta^ohoj aqj ajBdajg (a

•sdajs SuiA^ogoj aqj joj gxi"S IT^jag oj Jaja

oq

jauBd juojj aqj uo ja^oBjq qojiA^s aqj junoj^ (

-qojiA\.s Ja^ooj aqj oj s^jiav dn^o

'sdajs Suiavoiioj aqj ut sqoBf auoqd puB sa

JO VJ^d

^

*(SN) 8

"UAVoqs sb jaj^oBjq qoji^S Ja^ooj aqj uoijiso

jo i 3ni oj(t-g) vjo I Sni uiojj ^jiav 1(

^no^ pjbavoj jauBd juojj aqj jo juojj aqj qjt^v (A

^jjadojd si ji jt aas

jo g jjb^ oj Jajag "Smuado aqj ut pajajuao

-uao aqojpaau uiaqj jo ^ub jj 'g
pire apis Srq aqj uiojj qojiA^s aqj dsBjS 'paja

uiojj ja^oBjq qojiAvs aqj aAOiuaj ^gnjajB

#(SN)

tlz

j

"(SN) H

ixiojj uoijBinsui aqj ij

aqj Suiqjnjstp jnoqjiAV puBd juojj aqj

SAvajos qjoq uajqSij uaqj, 'uoijisod saqojiA\.

*(SN) H JO z Sni oj (i-s)

g jo z ^rq oj (T-g) v J Z Snl

jo g Snj oj (j-g) f jo $ 2n\ uioj

jogSnj uiojj ^jiav aqj joauuoQ '^jim dn^ooq

SA^a jos puB puBd juo jj aqj jag 'qojiM.s qoBa jo

n

q

dn^ooq ^oBj

•sdajs Suimoijoj aqj joj jj-g ibtjojoi^ o
s

sajoq aSjBj aqj Suijor

-T oav^ tuo^j uoT^^insux atj^ jo \ie aAoraa

auo pub g pub z s^nI punoaB aJtM. auo

s

^ a q^^T^s jo g pub g sSni punojB

•Xl-g

^tao^oT^uoSuiAi^ap^asuTaq^ ut UAvoq

-qo j

noqjtM. suoijoauuoo jnoj aqj Japxog

*s2rq aqj m

u

uiojj a^iA^ papuejjs ^oBjq ,,8/8"! ^ joa

g qojiAVS jo g Snj oj (j-g) a ipj^is jo g Srq

)

•sSrq aqj aAoqB ajiA^ aqj uoijisog "(I~S

..9

Page 59

') Connect a 1-3/8" black stranded wire from

lug 3 of switch D (S-l) to lug 2 of switch E

/(S-l).

(^) Position the chassis as shown in the Picto

rial and place the switch bracket in front of

it near the right apron

Connect the wires coming through grommet CA
to the,, switch bracket in the following steps.

ray wire to lug 2 of phone jack B (S-2).

4

^^iite

(^) White-gray wire to lug 1 of phone jack B

NOTE: Where a wire passes through a connection

and the
step, it will count as two wires in the solder i
structions (S-2), one entering and one leaving the

connection

-

(S-2)

.

n goes to another point, as in the next

.

.

n

("^Remove an additional 1/4" of insulation from

the end of the orange wire. Connect the wir

through lug 4 (S-2) to lug 1 (S-l) of C

Remove an additional 1/4" of insulation fro
the end of the yellow solid wire. Connect th

wire through lug 5 (S-2) to lug 2 (S-l) of C.

blue wire to lug 4 of D (S-l)

ire to lug 1 of D (S-l).

green wire to lug 5 of D (S-l).

wire to lug 2 of D (S-l).

yellow wire to lug 4 of E (S-l)

(^(Yellow wire to lug 1 of E (S-l)

The brown wire will be connected later

.

.

.

e

.

m

e

.

PICTORIAL 5-1

1

09

g piaopi^

aadp

jiuooaqi uiojj saaiM. aqi

•(I-S) di

^

y

i

•(I-S) ^ jo I Sni oi 9^TAV pali L

•(I-S) d Jo Z SnI OJ 9^T

•sdap Sut^oipj aq; joj ^p

M

L^

)

jaijTpui^

-pj aqi ut p^o-B^q qo^^s ai^ o^

uaaj^5 ( )

M

(^

)

•(I-S) i P S ^ni o^ a^i/A ^o^

'(I-S) d JO 9 ^nI

^

i

^

g

i

*(I-S) d jo

'(I-S) 9 JO ^^ Sni o

•(I-S) 9 JO I Sni o

•*(I-S) 9 jo 9

'(I-S) O JO Z SnI OJ

*(I-S) O JO 9 Sni o; aai^

*(I-S) O jo g Sni o

lOl

d

21-S "IViaO

Page 61

Refer to Pictorial 5-13 for the following steps

r ) White-gray wire to lug 4 of H (S-l).

(^ Gray wire to lug 1 of H (S-l)

.

(^^f Yellow marked cable to lug 5 of H (S-2).

(^TTfnmarked cable to lug 2 of H (S-2).

,

(^"filed marked cable to lug 6 of H (S-l)

fvfGreen marked cable to lug 3 of H (S-l)

The white-blue wire will be connected later

.

.

.

G

'

•

PICTORIAL 5-1

3

89

(,.9)

(,,

9

I

O

(,,

9

(m9

x

(

j

x

\

x

o

j
x

s

Q u

x

odxa aqx j

•spua aqx o

•sdaxs SutA^oxjoj aqx

uaxsB3 '

q

b

X

b

"spua pBaj pas

: Japios qxpw auioo ^bui spBa

uiojj

8# qxT^ ^a>iO^a

sissB

qo aqx ox pub sxnu gg-8 pu

•sdaxs Suiaudxioj aq

aqxox JauuojsuBJx JaAvodaqxjospBai aqx Xno/

uiojj spBaj aqx ajnsBap\[ 'paxBoipui sqxSua

•jauuojsuBJj aqx jo x*"io auioo Aaq

jo pua aqx uiojj uoijBXnsuT jo it^/

aqj jaqxaSox xsim.x "pBaj J3uijojsubjx qoBa

03 ( >)

j

ip^aj qoBa jopua aqxx^ aJi^ jo spuBJjs xi^tus

qoBa uo Japjos jo junouiB xi^uis b xiotu uaq

asaqx :ai>N

/sdax

s

(99

a

^

jj sp^a^ aqx

TO Aiddns aaM.od aqx ox

i

^jOA\. JnoA uo jauuojsuBJx JaAvod aqx aoBjg ( .)
uA^oqs sb xno Suxuioo spBaj aqx ixjtav aoBjJn

jaAosisSBqo aqxaOBjduaqj^ 'gx-X-Q U^^

Sujxunoui jauiaojsuBJxaqxoxuo puB spBaj aqx

a

qx uo j3ui.iojsub.ix ^^

u aans a^pey^ 's^aoBds x^uoS'Bxaq ,,8/x-

o

sxssBqo aqx uaaA^xaq paqouid ^j

f

)

•(I-S) Z aioi

•(I-S) Z.

aa

S

^

q o^ p^ai paj auo ^f)

3

jo sji^d paxsiA\.x o^x UU

om.x aqx aaqxaSox Suixstavx ^q sp^ax jauiao

siqj, 'spBax anxq oavx aqx pu^ sp^ax paj

aqx uoixxsod ox aais^a XT a^^tu

^ax"BauB apiAOJdpu^ siss^qo aqx

aqx uio

aqx sua;s^j x^qx A\.a^os aqx aAom

aq^ o^ pa^oq xin^io ^

ox aaq^o aq^pu^ (x~s) I ^

cq jaqxo aqxpuB (x~S)9 aioq cq pBai aniq auo in

*(t"S) 8 9ioij ox p^aj ua

XauituojS qSnojqx puaj uaajS Sucq aqx axnog C^)

paxoauuoo aq xipa xj ^3

) Yellow-blue lead to hole 6 (S-l).

The remaining four transformer leads will be
connected later.

Connect the free ends of the wires coming from

the power supply circuit board in the following

steps

.

Page 63

(*f Red wire from hole 16 to lug 2 of capacito

. CU(S-2). •

Black wire from hole 18 to lug 1 of CU (NS)

) Black wire from hole 17 to solder lug 3 a

C^ (NS)

.

(y^ Connect a 3-1/2" black stranded wire fro

lug 1 of capacitor CU (S-2) to solder lug
at CT (NS).

Connect the cable assembly coming from grom

met GE in the following steps.

Blue wire to connector 13 of the power
supply circuit board (S-l).

{kX

W

White-blue wire to hole 19 of the powe

sppply circuit board (S-l).

^ Black wire to solder lug 3 at CT (S-3).

(^^ White-orange wire to connector 1 on the

/ight power amplifier circuit board (S-l)

r

.

#

t

m

3

Detail 5-14

(l/^ Route the transformer leads, hookup wires

-

and cable assembly as shown

C

,

.

Refer to Detail 5-14C for the following steps.

r

Locate the transistor insulator and a co

tainer of silicone grease. Apply a layer o

grease on each side of the insulator. Use

n

f

approximately 1/8 of the container for each

side.

.

Position the insulator as shown and place

it on the chassis over slotted hole CF.

(^^7 Orange wire to connector 1 on the left

power amplifier circuit board (S-l)

.

C^ Carefully inspect the power' supply circui

board for any unsoldered connections, so
der, bridges between foils, or broken leads.

l

Clip off any bare wire ends from the foil

of the board.

Route the control preamplifier cable assem
bly against the bend in the chassis under

the circuit board

Make sure the transistor which is c

W)U

.

on

nected to the foil side of the circuit board

is bent out as shown in the Pictorial. Then

fasten the circuit board to the nylon insul

tor with two 6- 32 x 3/4" self-tapping screws.
Do not over tighten the screws

.

a

Place the transistor on the insulator an

fasten both to the chassis. Use a 6-32 x 3/8"

t

screw, a #6 fiber shoulder washer, a #

lockwasher, and a 6-32 nut. Make sure the

shoulder of the fiber washer is seated in

the chassis slot.

Locate the line cord and line cord strain re

lief.

is/) Apply a small am

ach lead to hold the small wire strands t

e

gether.

ount of solder to the end o

kr^) Insert the line cord through hole BJ. Co

nect one lead to lug 1 of socket BG (NS)

Connect the other lead to lug 2 of socket B

(S-3)

.

d

6

f

o

n

.

F

A3N

uno

0

d

AA1 3H1 3Z33HOS 3NI1 3Hi 3DVl

^V3H 3H1 1 B3 S N I

310H 3H1 01NIJ1VH •y3H13901 S1N3WO3S 'iOTS 3H1 Ml 0 H00

o

33

HO

V X

V

H

OI1

X
3

A 02

1

HXSNI 3H

O

V

X

^OA 3MI

O

V

X SNOIX

HO

A N

I 3

'V3HV H

O 3SIL "uotuuioo 9 joui st ^VA O^^Z sgjaj

3HX H

XIM

j

pu'B iio^xq-pga gqj agqjgSoj jstmx

"sp^9X aguiJOjsuBJj ^lO'EX^

sb J9TX0J uibjjs oqj ui paoo outj oqj 90BXd ( A

U

T

T

9 ajoq in

SB pJOO

3OV

11O

A 3

N

H

31

V

N

y

3

11V

s

S

o

oxgq U9at

VA OZI ^QJ auo ^

^ 'pasn uajjo jsoiu si qvA OZT

j

ut 9XTM

9Ujx 9q

suoijanajsui Suijia^ ^Sbjxoa ^ujx jo sj^

aqj pu-B 9Sbjxoa gujx ^

'"V'S'n am ^I 'aS^JJOA 9ujx ^VA Ot^Z Joj agqj

j

jo x S

r

(/>,)

f

0

9qj oj p990OJ,

s

H

'

H

'sdaj

m(fS) O

'9pTSB J9S 9q UBO

*(Z-S) H9 ^apioq^snj jo ^ Snx o

qjoq jo^uuo^ *

b si 9snj SuiuiBiugj gqx

puy A0J09XJ9

•sdgjs Sut^oxxoj gqj ao

o

j

UT S9S11J 9J9dlU^-g 9q^ JO 9U

X9UBX

3

W

Q

-S MD13

Page 65

240 VAC Wirin

Refer to Detail 5-14F for the following steps

( ) Twist together the red-black and black

transformer leads.

( ) Connect the red-black transformer lead t

lug 2 of fuseholder BH (S-2).

( ) Connect the black transformer lead to lug

of socket BG (S-3).

g

( ) Twist together (clockwise) the entire lengt

and the ends of the green-black and yellow-

.

o

1

black transformer leads. Then install the
wire nut over the ends of the leads; turn th
nut in a clockwise direction. Refer to the i
set drawing on Detail 5-14F

( ) Install a 1-1/2-ampere fuse in the fuse

holder. NOTE: This fuse is not furnishe

with the Amplifier

.

.

h

e

n

­d

240 VOLT WIRING

Detail 5-14

F

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V9L-S II013

HB^^KKI

T

Page 69

Refer to Pictorial 5-16 and install an 8-32

1/4" setscrew in one of the knobs. Then i

stall the knob on the rotary switch shaft

Turn the rotary switch shaft fully counter
clockwise. Then turn the shaft clockwis

two clicks (to the Tape pos

the knob.

ition) and remov

(S) Start an 8-32 x 1/4" setscrew in the indi

ca

x

n

.

Position the bushing toward the chassis and
the cutout in the disc straight up as shown
Then install the disc on the rotary switch

.

shaft. Turn the disc clockwise until the slot

is positioned as shown with respect to a

e

e

imaginary line drawn vertically through the

center of the switch shaft. Refer to the inse

n

t

drawing #2. Place the disc 1/16" from the

dge of the light reflector as shown in inset

e

drawing #3 and tighten the setscrew

.

PICTORIAL 5-1

6

O

L

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lOl

d

il-S "IVIbO

Refer to Pictorial 5-18 for the following steps

NOTE: Be careful not to scratch the black su
face on the back side of the control window whil

performing the following steps

lace the control window inside the front

panel opening. Refer to Part A of the Pic

torial. Push the top edge in first, and then
the bottom edge

.

.

Page 71

1

.

r

e

Peel five felt washers from the backin
paper, center them over the five holes i
the control window, and press them in
place

.

) Cut two 2-3/4" lengths of foam tape and pee

off the backing paper. Make sure the dial

window is all the way in place on the front

panel. Then press the tape in place against

the sides of the front panel next to the dial

window. Refer to Part B of the Pictorial.

g

n

l

PICTORIAL 5-1

AM TAPE

8

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M

3

L2-

S

ial 5-22 and connect the

green transformer lead coming from grom

met CE to solder lug Z (S-l).

This completes the assembly of the Amplifier.
Proceed to the Initial Checkout section.

NOTE: Set aside the four 6-32x3/4" self-tapping
screws and four 9/16" flat washers; they will be
used to fasten the Amplifier in the AE-18 Cabinet

if one was purchased.

Page 75

-

PICTORIAL 5-2

2

9

L

INI

TIA

L C

HEC

K

O

U

T

The purpose of the Initial Checkout section of th
Manual is to make sure that your Amplifier wil
operate properly, and that it will not be damaged

as a result of a wiring error or some other

difficulty when it is first turned on. A transistor

for example, could be destroyed instantly by a

short circuit that causes excessive current.

Initial Checkout is divided into the following

parts

:

INSPECTIO

Refer to Figure 1-1 (fold-out from Page 66
for the following steps

Set all of the Amplifier switches and controls a
directed in the following steps. Then do no

change the position of any control or switch un
less a step or check instructs you to do so

SOURCE: AUX (Full clockwise)

BASS: Center of rotation.

/TREBLE: Center of rotation

.

.

.

1.Inspection. A careful check for obviou

e

l

,

assembly errors or visible problems

2.Resistance And Test Lamp Checks. These
checks make use of an ohmmeter and atest

lamp to make sure the power supply and D

voltage distribution circuits are not shorted

3.Hum Injection Tests. These tests assure yo

that all sections of the amplifier are ope

ating properly.

N

)

s

(O"T0NE FLAT: OFF

t

.

CO mUDNESS: OFF.

CO MAIN SPEAKER: OFF.

CO REMOTE SPEAKER: OFF.

: MONO (Monophonic)

MON (Monitor): OFF

.

.

s

.

C

.

u

r

) BALANCE: Center of rotation

; ^LUME: Full counterclockwise.

HEATHKIT^

.

( f POWER OFF.

All ten Level controls: Full clockwise

.

77

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Page 7

9

( ) Connect the negative (black) oh

lead to the chassis

.

mmeter tes

NOTE: The internal wiring of most ohmmeters is
such that the positive terminal of the meter ba
tery is c

and the negative battery terminal is connected t

onnected to the positive (red) test lead

the negative (black) test lead. In some ohmmeter

this wiring is reversed and erroneous reading

will be obtained when making the following meas

urements. Try reversing the ohmmeter leads i
the measurements do not check out correctly th
first time.

Perform the resistance checks by c

onnecting the

positive (red) ohmmeter test lead to each of the
test points listed in the following chart. Hold th
test lead to each of the test points for at leas

one minute until the reading stabilizes. Refer to
Figure 1-2 for test point locations. If any of your
r

eadings are not within the resistance readings

shown in the chart, refer to the In Case Of Dif

iculty section of the manual and repair the di

f
ficulty before proceeding

TEST POINT

.

READING

t

TEST LAMP CHECK

S

( ) Disconnect the red stranded wire of breakout

#8 from the positive (+) lug of capacitor CU

t

Locate the spare lamp socket, #47 lamp, and

o

s

s

470 ohm (yellow-violet-brown) 1 watt r

sistor. Solder one lead of the resistor to one

lug on the lamp socket. Insert the #47 lamp
into the socket. This will be used in the fo

f

e

lowing test

NOTE: When you are instructed to make c

.

tions in the next two steps, merely place the end

e

of the lead against the lug and solder it. These

t

are only temperary connections to make tests.

( ) Connect the free lead of the 470 ohm resis

tor to the positive (+) lug of capacitor CU a

shown in Figure 1-2

.

f

( ) Connect the red stranded wire from breakout

#8 to the other lug of the lamp socket. Pos
tion the socket and resistor leads so they do

not touch any part of the chassis

.

e

l

onnec

s

i

.

( ) Positive (+) lug of

capacitor CU

.

( ) 8
( ) 1

0

( ) 1

1

2

000 2 or higher

5000 2 or higher.

1500 2 or higher

1200 2 or higher

.

CAUTION: When the line cord plug is connected
to an AC outlet, AC line voltage will be present

at several places under the chassis. Be careful

that you do not contact this voltage or an electr

cal shock could result

.

( ) Plug the line cord into an AC outlet

.

.

i

.

0

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Page 81

HUM INJECTI

To make hum injection tests, you will touch th

tip of a narrow-bladed screwdriver to the signa

input points of the various circuits. By noticing

the sound reproduced by the speakers as yo
touch these points, you can determine whether
the circuits are operating

Before you begin the tests, make sure the
switches and controls are in the following p
sitions. Then do not change any control or switc

from these positions unless a test directs you to

do so.

() Source: AUX (fully clockwise)

() BASS: Center of rotation.

() TREBLE: Center of rotatio

() BALANCE: Center of rotation.

.

.

n.

ON TESTS

CAUTION: Full AC line voltage will be presen

e

l

at several places in the Amplifier when the lin

c

ord plug is connected to an AC outlet. Use

screwdriver with an insulated handle, and do not

u

let your fingers touch the screwdriver shaft whil
any part of your body is in contact with any con

ductor, metal object, or the chassis. Be especi

ally careful that you do not touch the AC acce

o

sory sockets, POWER switch, or fuseholder.

h

As you make these tests, touch the tip of the

screwdriver blade only to the point specified
Be careful that the screwdriver does not slip, o
short across two points at once. If you do no
get the proper response in any of these tests

refer to Stage-By-Stage Signal Injection (Page

100 in the In Case Of Difficulty section of this

Manual). Then locate and repair the cause o

trouble before you continue with the next test in

this section.

POWER AMPLIFIER TES

t

e

a

e

s

.

r

t

,

f

T

() VOLUME: Fully counterclockwise.

() MODE: Stereo

() TAPE MONITOR: Off.

() LOUDNESS: Off

() MAIN SPEAKERS: Off

() REMOTE SPEAKERS: Off

.

.

.

() POWER: Off.

() All ten Input Level controls: Fully clockwise.

You may want to follow the circuit on the Bloc
Diagram (fold-out from Page 112) and the Sch

e

matic Diagram (fold-out from Page 125) as you

perform the following steps.

( ) Connect a speaker to the LEFT MAIN

SPEAKER terminals on the rear of the

Amplifier. Then connect another speaker to

the RIGHT MAIN SPEAKER terminals. See

Figure 2-1 on fold-out from Page 89.

( ) Press the MAIN SPEAKER switch to ON

.

( ) Connect the line cord plug to an AC outlet

and press the POWER switch to the O

position.

N

Refer to Figure 1-2 (Page 66) for the following

tests

.

Perform the following test twice, once on the

left channel power amplifier circuit board and
once on the right channel power amplifier cir

cuit board.

( ) ( ) Hold your finger on the metal part of the

k

screwdriver and touch the screwdriver

tip to Point 1 on the power amplifier cir
cuit board. A very faint click should b

heard as you touch each test point.

e

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o

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FIN

NOTE: If the Amplifier is to be custom mounted
or installed in the Heath Accessory Cabinet

complete steps 3, 4, and 5 only and refer t

Part B of Pictorial 5-23. If the Amplifier is t

be placed on a shelf or a similar location, com

plete steps 1 through 5 and refer to Parts A and

B of the Pictorial

A

L A

.

SS

E

M

B

L

Y

,

o

o

E

R

1.( ) Pos

2.( ) Mount the four plastic feet on the bo

3.( ) Place the Amplifier on your work su

4.( ) Pos

5.( ) Install six #6 x 1/4" sheet meta

ition the bottom plate with holes A
and B as shown. NOTE: The botto
plate is perforated with ventilatio

holes. However, the mounting holes

can be identified by their larger d

ameter.

tom plate with 6-32 x 3/8" screws,
#6 lockwashers, and 6-32 nuts. NOTE
Do not use the mounting holes calle

out in the Pictorial.

face as shown.

ition the bottom plate with holes

and B as shown. Then mount the plat

on the chassis with two 8

screws in holes A and B. T5o not fee

the holes called out in the Pictorial.

screws in the indicated holes

:l

.

m

n

i

t

:

d

r

A

e

-

l

IF AMPLIFIER IS TO BE SHELF MOUNTE

(2) 8-32x1/4

NOT USE

SE HOLE

'

S

PART

IF AMPLIFIER IS TO BE USED WITH

CABINET OR CUSTOM MOUNTED

PICTORIAL 5-2

B

DO NOT US

THESE HOLES

D

l6)#6-l/4

SHEET META

E

3

SCRE

"

L

W

HBATHKIT

8

8

3

J