Vox AC15C1 Service Manual page 9

1 2
A
B
P21
CFB 1
+27V 2 U1A
TO MAIN PCB
GND 3 TL072ACN
-27V 4
Header 4
R28
1K
C
R29
1K
D
1 2
3
P20
1
2
ISS3
3
was: 100pf 50V C0G
47pF 50V C0G
C16
GND
ISS2
4
R22
R27
11 5
10K 1%
6
82k
SW1B
was: 270pF 50V C0G
C17
120pF 50V C0G
ISS3
R26
220k
C15
R25 R24
2 7
1
10K 100K
A U1B
3 100nF 50V
TL072ACN
GND
ISS3
SG1
+15V
GND
C7
D5
10uF 25V
GND
D6
C8
10uF 25V
-15V
3
4 5
P1 7 0dB
12 8 -10dB
16ohm Z in
9 -20dB
1/4" Spade
SW1C
ISS2
(VR Main PCB) A500K
P23
P22
ISS2
R31
CFB2
ISS2
22k 1%
3R3 10W
+15V
10nF 50V
ISS2
C13
GND 3R3 10W
6
ISS2
2R2 5W
B
R32
5
CFB3
22k 1%
10nF 50V
ISS2
C14 R23
GND 2R7 5W
10K 1%
-15V ISS2
2R7 5W
GND
ISS2
1R8 5W
Drawing Number:
VD-A30021
CHANGE HISTORY
3 02/09/15 Update C16 & C17. Add chassis GND
Issue Date Change
4 5
6
1 P5
R8
2 10 16ohm Z out
3 To Impedance selector switch
1R 3W
1/4" Spade
SW1A
GND CFB2
Header 4
CFB3
Header 4
R9
R10
R30
R14
R15
R16
Designed By:
D Clarke
VOX Amplification ltd.
1 Harrison Close
Knowlhill
DC Milton Keynes
Bucks, MK5 8PA
Signed
6
7 8
Checked By: Date:
* 04/09/2015
Title Revision: Sheet
AC Reactive Attenuator
3 1 of
7 8
A
B
C
D
1