DYNACO Stereo 80 - Page 19

00601P 3 3
STEREO 80 BIAS ADJUST & INDICATORS
3 MAR 95 OFREV PAGE DWG#
SW2
ULTRALINEARTRIODE
D10
LED5
R75
1K 1K
R76
LED6
P3
25K 25K
P4
R71 R72 39K 39K
V3 BIAS ADJUST V4 BIAS ADJUST
CW
C52 C51
160V
.1uF
14
7
.047uF .047uF
11
13
12
8 9
10
1/4
1/4 1/4 1/4
4
1
6 5
2
3
LM339
U3
160V 160V
C55
GREEN
RED
(V3 BIAS)
C54
C53
14
7
.047uF
.047F
11
13
12
8 9
10
1/4
1/4 1/4 1/4
4
1
6 5
2
3
LM339
U4
160V 160V
Y3
+12V
Y4 Y7 Y8
GND
R63
20.5K
127
R64
127
R65
17.4K
R66
(74mV)
(87mV)
R55
1.1K
R56 R57
R58
1.1K 1.1K 1.1K
BIAS ADJUST PC BOARD
(MOUNTED TO FRONT PANEL)
BIAS INDICATORS
OFF ON
SW3
P3 P4 P7 P8
- 60V
P7 P8
25K 25K
R73 R74 39K 39K
V7 BIAS ADJUST V8 BIAS ADJUST
M1
K1 K2
M2
(TRIODE) (ULTRALINEAR)
R51 10K R52
10K
R53 10K R54 10K
CW CW CW
+12V
2 1 3
1 32
GREEN
RED
(V4 BIAS)
LED1 LED2
GREEN
RED
(V7 BIAS)
R59
1.1K
R60 R61
R62
1.1K
1.1K 1.1K
GREEN
RED
(V8 BIAS)
LED3 LED4
REDAMBER