1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
D D
C C
B B
A A
1
VOX Amplification ltd.
1 Harrison Close
Knowlhill
Milton Keynes
Bucks, MK5 8PA
2
AC15C1/H Preamp
VD-A30015
7
09/09/2015
Title
Drawing Number:
Date:
Revision: Sheet
of
Designed By: Checked By:
D Clarke *
Issue ChangeDate Signed
CHANGE HISTORY
R8
1Meg
R9
33K
R14
1K5
GND
BPJ-BBB-MONO
JS1
J6A
J6B
J6C
J6D
J6E J6F
J8A J8B
J8F
Tone Cut
VR8
B220K
R75
22K 1W
R74
510K
R69
10K
R66
3.3Meg
R61
1Meg
R71
100K
R73
33K
R67
27K
R68
470R
GND
G
D
S
MF1
LND150N3-G
TREM_OUT
J8C
TB Volume
VR2
A500K
BPJ-BBB-MONO
JS2
R21
1Meg
R20 33K
Normal Volume
VR1
A500K
330K
R1
R19
1K5
Treble
VR3
Bass
VR4
A1M
R17
100K
R32
10K
R22
470K
R23
330K
R25
120K
R24
820K
3
2
1
U1A
NJM2147
GND
C58
4.7nF 500V
R39
3K3
+27V
R38
10K
Q2
2SC2910
R72
10K
R70
3K3
+27V
1
2
3
Q1
J174
C50
100uF 35V
C47
10uF 350V
C7
22uF 25V
C14
22uF 25V
C11
10nF 500V
C6
470pF 500V
C4
120pF 500V
C13
56pF 500V
C38
47pF 500V
C49
10nF 500V
C44
10nF 500V
Speed
VR6
C2.2Meg
Depth
VR7
B500K
HT
VOUT+
VOUT-
Htr1a
Htr2a
Htr1a
Htr2a
J8D
J8E
R4
Ferrite
R10 Ferrite
R13
Ferrite
R16
Ferrite
C12
22pF 50V
C10
22pF 50V
C9
22pF 50V
C19
220nF 63V
1
2
3
TCN2
1
2
3
CON1
BJ-BBB-STEREO
J3
1
2
3
CON2
1
2
3
TCN3
R26
47K
R27
1M
R28
1M
R29
4K7
C21
560pF 100V
5
6
7
U1B
NJM2147
3
2
1
U2A
NJM2147
5
6
7
U2B
NJM2147
3
2
1
U3A
NJM2147
5
6
7
U3B
NJM2147
3
2
1
U4A
NJM2147
R46
47R
R37
47R
R36
47R
R35
47R
R33
47R
R31
47R
R30
330K
GND
R45
4K7
R43
220K
R52
100K
1
2
3
CON3
1
2
3
CON4
GND
5
6
7
U4B
NJM2147
C37 330pF 100V
R57
56K
R60
56K
R54
22K
R58
3
2
1
U5A
NJM2147
Reverb Level
VR5
B100K
R55
3K9
Text
Htr1aHtr2a
C26
10uF 350V
GND
C8
120pF 500V
TOP BOOST
NORMAL
R41
47R
Use Screened cables for reverb leads
J4B J4C
J4D
J4E
J1B J1C
J1D
J1E
J5A
J2A
J5B J5C
J5D
J2B J2C
J2D
R3
10K
R2
10K
C3
10pF 50V
C2
10pF 50V
C1
10pF 50V
R15
56K 1W
R5
100K
R7
22K
R6
100K
R34
100K
R18
10K
R51
100K
R56
100K
R81
10K
R82
10K
R40
1M
R42
47K
R44
1K2
R49
1M
1
2
3
4
5 6
7
8
9
V1
12AX7
1
2
3
4
5 6
7
8
9
V2
12AX7
1
2
3
4
5 6
7
8
9
V3
12AX7
R48
Ferrite
C33100pF
C39
100pF
R47
Ferrite
R53
Ferrite
R50
Ferrite
R64
Ferrite
C48100pF
C40
100pF
R63
Ferrite
R59
Ferrite
R62
Ferrite
REV SEND
REV RETURN
PIN3 connected to chassis
C22
10uF 350V
C15
10uF 350V
C16
120pF 500V
J2E
J1A
C67
10pF 500V
C68
1nF 500V
C69
10pF 500V
C5
22nF 400V
C20
22nF 400V
C24
22nF 400V
C46
22nF 400V
C32
100nF 400V
C34
100nF 400V
C41
100nF 400V
C43
100nF 400V
C45
100nF 400V
C35
100nF 63V
C5122nF 400V
R93
33K
1
2
3
P20
1
2
3
4
P21
Header 4
+27V
-27V
GND
VR9A
A500K
VR9B
A500K
GND
MASTER VOLUME
TO ATTENUATOR - USE SCREENED CABLE
To Attenuator
5 10/04/15 Parts Added For Attenuator Integration DC
ISS5
ISS5
ISS5
ISS6
6 23/06/15 VR9b Reversed DC
R581
R58 - Head = 1k
R58 - Combo = Not Fitted
R581 - Head = Not Fitted
R581 - Combo = 1K
P21 - Head = Fitted
P21 - Combo = Not Fitted
ISS6
R82 Value updated, R821,C161 & C162 added
C161
47pF 500V
C162
10pF 500V
ISS6
5
6
7
U5B
NJM2147
GND
ISS7
7 07/09/15 DCAdd U5B
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