Page 1
54321
6
NOTES
R108
C114
1000p
RV2
C103
22n
RV1
10K 2W
BRILLIANT
VOLUME
NORMAL
VOLUME
GND
R8
470K
R7
470K
3A MAINS FUSE
7
8
GNDGND
F2
C1a
32uF
6
12AX7
R109
1K
R113
100K
V2B
D
TOP
BOTTOM
GND
R4
1M
R5
68K
R6
68K
NORMAL CHAN.
TOP
BRILLIANT CHAN.
C
BOTTOM
GND
B
MAINS SWITCH
SW3
R2
68K
R1
1M
R3
68K
POWER ON INDICATOR
C1b
R106
16uF
220K
450V 450V
GND GND
V1A
1
2
R?
220K
C102
47nF
470K LOG
470K LOG
3
12AX7
R101
2K2
GNDGND
GND
6
V1B
7
8
12AX7
R101
2K2
GNDGND
A
N
H2
E
NEON
RES
SW1
A
GND
1 2 3 4 56
POLARITY SWITCH
C3
47nF
CLASS Y2
GND
R117
22K 2W
C114
1000p
R112
100K
C110
47n
C111
47n
MAINS TXFMR
F1
1A HT FUSE
R116
220K
R9
22K
MID
RV5
100K LIN
BASS
RV3
500K LOG
GNDGND
GND
C115
220p
TREBLE
RV4
250K LIN
C1
1nF
D221
BYX94
350-0-350 VAC
D220
BYX94
R213
110K
D211
BYX94
R205
27K
GND
R11
22K
MASTER
VOLUME
RV7
250K LIN
GND
(2x220K in II )
BIAS -36V
C206
100uF
63V
GND
R126
100K
6
V4B
7
8
12AX7
R130
C131
2K2
47nF
GND GND
GND GND
PRESENCE
C127
C3
1000p
22nF
R127
1M
RV6
GND
100K LIN
R10
470R
STANDBY SWITCH
R15
C7
220K
R16
C8
220K
GND
GND
220uF
350V
220uF
350V
V4A
1
2
3
12AX7
R128
R125
560K
100K
C2
100n
SW2
STANDBY
INDICATOR
R?
1M
C122
100nF
GND
2
+460V
Rneon
220K
H1
NEON
1
3
GND
R120
82K
V3A
12AU7
R216
100R 5W
R14
220K
R12
220K
GND
R123
22K
R124
2K2
GND
R13
1K 1W
C6a
50uF
C5
220uF
350V
R119
91K
6
8
+420V
C119
C118
V3B
12AU7
7
GND
C6b
50uF
47n
47n
R202
470R
C201
10n
+420V
1. HEATER WIRING NOT SHOWN
2. C1 16+32uF NOT AVAIL. REPLACED WITH 50+50uF
3. C206 REPLACED WITH 220uF/63V
4. BYX94 DIODES OBSOLETE REPLACED WITH 1N5408
5. V2A (half 12AX7) IS NOT USED
3
V5
R201
10K
R207
22K
R209
100K
BIAS -36V
R212
100K
R214
22K
5
8
Title
B
Date: 21-Mar-2002 Sheet of
File: G:\projects\Lads2d\HIWATT-SA412.ddb Drawn By:
1
4
EL34
GND
V6
EL34
R19
1K 5W
R20
1K 5W
HIWATT SA412 - Maufacture Date 8/10/1974
Number RevisionSize
PARTRIDGE TG6556
R17
10K
R18
100R
11
GND
16 Ohm
8 Ohm
COMM.
Ian Miller
INTERNAL
SPEAKERS
(16 Ohms)
EXT. SPKR
(8 Ohms)
SLAVE OUT
D
C
B
A
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