Heathkit AA 151 Kit Schematic

Page 1

LEFT 3
CHANNEL

U
X

VIB
l/Z 6EU7

l

TONE CONTROL
NETWORK (REC)

,___-____..____-__-___-______--___-
m__-_--_____.-____-._______-.__-_---

Aux
470K
. aauur
33K
TUNER
xTAL
PHONO
MAO
PHONO
MAG.
PHONO
XTAL
PHONo

RIGHT
CHANNEL 33 UL"

IOSIZS VOLTS
50 60 CYCLES
AL ERNATING

CURRENT

:1):

0N BLK
2 AMP
AC SWITCH s. a. m
101 UFD
= I6 KV

BLU

6.3 VAC
2.5 AMP 200

BLU R70

Ian
TO
8 LEFT
CHANNEL
50- SPEAKER
4n

CHANNEL
FILAMENTS

CHANNEL
FILAMENTS

SASS AND TREBLE 1/2 ROTATION

-* INDICATES CLOCKWISE TRAVEL.

VOLTAGES TAKEN WITH HEATHKIT VTVM. H7 V AC LINE SOURCE.
VOLTAGES MAY VARY 210% DUE TO TOLERANCE OF COMPONENTS.
SOURCE SELECTOR IN MAG. POSITION. VOLUME FULL CW. BASS AND TREBLE 1/2

ROTATION.

MODE SELECTOR IN STEREO POSITION FOR VOLTAGE READINGS.
OUTPUTS LOADED WITH I6 1! 20 W RESISTORS.

Q INDICATES VOLTAGE READING.

ALL READINGS FROM TEST POINT T0 COMMON GROUND.

SOURCE SOURCE '
SELECTOR SELECUDR
«63-253 «63-258 \05 l
FRONT REAR MODE
4 SELECTOR I
I was-259
c2; . mom . J, J;
\L/ 25
so - | O | A {50 _
- I -m : R35 I_ as)
40 9 NH# 44.3§g AHH . .33 4+ AANV AAA
' . ' 537.2%
I ;
22 K I | WATT . l I
' 5 MODE '
I I SELECTOR I
Sea-259'
' REAR
I I
I 3 I
I ---~-2; I
I . I RICHT CHANNEL
SPEAKER PHASE
I I REVERSAL
I
l
A
CEE I ' '. OUTPUT
ISOK .I. TRAN FORME
- ' |;: 0 Pee
I I I
TONE CONTROL / .. x
33K I NETWORK (REC) I I 1 BL
R7I 84 - 2 3 I 3 .
% AA , I I
1 , :
5 , : BRN
I
® I a:
I 56 UUF
V28 EEE
I/2 6E U7 TREBLE
MEC '
AUDIO 5 6n ,
4-) \
RED 150K- ~'
33UUF YE J
v I I Ion
pOWER 023 4/ 5AR4
TRANSFORMER AC 27K
~54-93
RES
BLK o 8
-Ac
SOURCE SELECTOR SHOWN IN MAG PHONo POSITION.
MODE SELECTOR SHOWN IN LEFT AMP POSITION.
{EEPT NOTES
R FOR VOLTAGE READING&
:5 =
SOURCE AND MODE SWITCHES ARE SHOWN IN MAX. ccw POSITION As VIEWED FROM
= .= 9 SOURCE SELECTOR MAG PHONO FRONT "MEL STEREO AM'UFIER
MODESELECTOR STEREO P Flo
VII 0234/ SARA VOLUME FULL cw ALL CAPACITORS IN uId UNLESS OTHERWISE S ECI E .
ALL RESISTORS I/z WATT UNLESS OTHERWISE SPECIFIED. MODEl AA . .5.

Page 2

ORIENT EACH #462-118 KNOB so
THE POINTER IS AT "120'CLOCK"

WHEN CONTROL

. *462-124

MODE SELECTOR
SOURCE SELECTOR 33?
BASS CONTROL
TREBLE CONTROL

#462124

IS

IN MID- POSITION.

VOLUME
CONTROL £9:

W,
2:

W
#362419 "2

Detail 9A

62-118

Page 6

CRIMP WITH PLIERS
AND THEN APPLY SOLDER

Pictorial 6