Heathkit AA 121 Schematic
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Page 1
VIA
CHANNEL
2 El
.05 zoov
AcHANNEL
LEVEL AND
Mom LEVEL
U
50/l5V
sav
SYEREO Mon
52
sI FUNCYION PHASE sELEcTon
sELECIOR
CHANNEL
E
500K .0: znov
Z "a CHANNEL
LEVEL
Sony 650
BLU-VEl
NnTEs:
ALL REsIsToRs ARE I/2 NAVY UNLESS SHOWN OTHERWISE.
ALL CAPACIYOR vALuEs ARE IN Ia uNLEss 5HOWN OYNERWISE.
ALL RESISYGR VALUES ARE IN oHMsl
. Loco ows, MEG . Lemma cums).
ALL VOLTAGE READINGS ARE m: racM POINT INDICATED To CHASSIS
GROUND. IEXCEPY Ac voLTAGEs ON POWER TRANSFORMER NINDINGSJ
READINGS WERE TAKEN WITN II MEGOHM mvur vTvM.
* 2x MATCHED PAIRS.
sILIcoN
RECYIFIERS _ + _ +
RED
+
+
on
:URGISTOR
I90
II-r VAC
50mm - - - -I
Ac a A:
NORMAL :wITcHEn >
FUSE
4 AMP sLow new
EB
Ioox
. mm:
SCHEMAIIC OF THE
HEATHKII'
80 WATT AMPLIFIER
MODEL AA-l2]