Vox AC15C1 Service Manual page 7

1 2
C3
10pF 50V
C2
10pF 50V
C1
10pF 50V
JS1
A
TOP BOOST
R2
10K
BPJ-BBB-MONO
JS2
NORMAL
R3
C11 C15
10K
10uF 350V
R4
BPJ-BBB-MONO Ferrite
GND
J1B
J4B
C16
TCN2 CON1
R9
2
1 1
2 2 33K
ISS6
3 3
B
R8
1Meg
J4D
J1D
Text
J4E
R14
1K5
J1E
C
R22
470K
R24
820K
R23
330K
U1A
2
1
3
NJM2147
R25
120K
R26
47K
D
C21
560pF 100V
R27 R28
1M 1M
GND
1 2
3
R18
10K
R7
22K
C22
10uF 350V
R6 R5
GND
100K 100K
C5
C4
120pF 500V
J2A
22nF 400V
J5A
C6
R1
C8
470pF 500V
120pF 500V
VR1
A500K
R34
Normal Volume
J1C
100K
J4C
C67 VR2
A500K
TB Volume
V1
J2D J5D
12AX7 7
2 12AX7
R20 33K
J2E
Htr1a Htr2a
J5B
R21
J2B
1Meg
C14
C7
R19
1K5
J1A
U4A
2
R46
1
NJM2147
3
47R
U3B
6
R37
7
NJM2147
5
47R
U3A
2
R36
1
NJM2147
3
47R
U2B
6
R35
7
NJM2147
5
47R
U2A
2
U1B
R33
6 1
NJM2147
7 3
47R
NJM2147
5
R31 47R
R30
330K
100pF C33
R29
4K7
R48 R47
Ferrite Ferrite
Ferrite Ferrite
R50 R53
R41
C39 100pF
47R
3
4 5
C26
10uF 350V
GND
C32
V2
7 100nF 400V
C13
VR3
Htr1aHtr2a
56pF 500V
R40
Treble
R17 1M
C19
100K
220nF 63V
C20
J5C
J2C
22nF 400V
R15 R32
VR4
C68
56K 1W 10K
A1M
Bass
1nF 500V
C37 330pF 100V
R52
100K
U4B
6
NJM2147
5
C35
VR5
100nF 63V
B100K
R43
R45
220K
Use Screened cables for reverb leads
4K7
100pF C48
CON4
R64 R63
1
Ferrite Ferrite
2
Ferrite Ferrite
3 R62 R59
C40 100pF
REV RETURN Q1
J174
2 R38
10K
Drawing Number:
CON3
VD-A30015
1
2 CHANGE HISTORY
3
REV SEND
PIN3 connected to chassis
7 07/09/15 Add U5B
6 23/06/15 VR9b Reversed R82 Value updated, R821,C161 & C162 added
5 10/04/15 Parts Added For Attenuator Integration
Issue Date
4 5
6
R75
22K 1W
R56
R51
100K
100K
C41
R81
VR8 10K
B220K
100nF 400V
Tone Cut
C38
C58
4.7nF 500V
C43
47pF 500V
R82
10K
100nF 400V
J8A J8B
J6A J6B
V3
J8E J6E J6F J8F
2 12AX7 7
Htr2a Htr1a
VR7
B500K
R44
Depth
1K2
R49
1M
R42
47K
C34
100nF 400V
R581 - Head = Not Fitted R58 - Head = 1k
R581 - Combo = 1K R58 - Combo = Not Fitted
ISS5
P21
1
+27V 2
To Attenuator
3
-27V 4
Header 4
ISS6
GND
P21 - Head = Fitted
R581 R58
P21 - Combo = Not Fitted
R55
3K9
U5A
7
2
R57
1
R93
NJM2147
3
33K 56K
R60
U5B
6
56K
7
R54
NJM2147
5
22K
ISS7
C69
GND
+27V
R39
3K3
Designed By:
D Clarke
VOX Amplification ltd.
DC
1 Harrison Close
DC
Knowlhill
Milton Keynes
DC
Bucks, MK5 8PA
Change Signed
6
7 8
ISS6
P20
VR9B
A500K 1
2 TO ATTENUATOR - USE SCREENED CABLE
3
ISS5
HT
GND
VOUT+
MASTER VOLUME
VR9A
A500K
VOUT-
ISS5
TREM_OUT
R73
33K
R71
100K
C45 C46
R67
27K
100nF 400V 22nF 400V
R74
MF1
510K
LND150N3-G
C49
D
G
C44
S
10nF 500V
VR6
C50
C2.2Meg
Speed
R68
Q2
C47
R66 R61
470R
2SC2910
10uF 350V
3.3Meg 1Meg
R72
10K
R69
10K
+27V
R70
3K3
CON2 TCN3
R16 J3
1 1
Ferrite
2 2
3 3
R13
Ferrite
BJ-BBB-STEREO
R10 Ferrite
C12
22pF 50V
C10
22pF 50V
C9
GND
22pF 50V
Checked By: Date:
* 09/09/2015
Title Revision:
AC15C1/H Preamp
7
7 8
A
B
GND
C
D
Sheet
1 of 2