Koch Twintone II Guide

REL3
REL1
REL2
to fx mixer
V1 - 12AX7LM
V2,3 - 12AX7
R15R14
R21
R17
R10
R16 R26
R9
R22
R25
R5
R29
R3
R24
R18
R6
R27
R11
R4
R23
R19
R13 R20
R7
R28
R12
P5-B
P5-A
P1
P6
P2
P7
P4
P3
P8
220K470K
470K
47K
33K
470K 470K
220K
470K
2n2
470K
100K
33K
100K
1W
100K
1W
100K
1W
100K
1W
100K
1W
150K
1W
1K5
1K5
1K5
1M 220K
1K5
820E
1W
2K7
A500K
A500K
B200K
B200K
A200K
A1M
A1M
B20K
B20K
+E
+D+E
+D
+D+E
C6
C17
C8
C11
C12
C10
C14
C13
C3
C19
C2
C18
C4
C20
C16
C1
C15
C7
C9
C5
100n
47n
47n
470p
270p
470p
4n7
100n
22n
270p
470p
47n
22n
470p
22u
470n
22u
680n
47n
3
33
8
88
2
22
7
77
1
11
6
66
V1A
V3A
V2A
V2B
V3B
V1B
CW
CW
CW
CW
CWCW
CW
CWCW
TREBLE
BASS
MID
TREBLE
BASS
MID VOLUME
DRIVE PRESENCE VOLUME
R2
R1
R8
10K
1M
100K
Normal
INPUTS
Bright Clean
1
8
3
7
6
4 5
2
TWINTONE II
PRE-AMP PAGE:
1 of 5
KOCH
GUITAR ELECTRONICS
Amersfoort
The Netherlands
DRAWN:
Dolf Koch
c
Copyright 2005, Koch Guitar Electronics
R30
R31
R32
P12
P11
470K
100K
1W
220K
1W
A200K
B1M C23
C22
C21
270p
4n7
120p CW
CW
SERIAL NRS:
x1434 - x3070
DATE:
25-07-2005
MARK
2.0

R52
R46
R47
R50
R51
R48
R49
33E
3W
10K
10K
470K
6K8100K
6K8
+F
-F
C30
C31
33n
100n
-
+
2
3
7
6
4
IC3
T1
T2
REL5
REL4
P12
25K
CW
R45
R41
R55
R56
R42
R40
R54
R43
R44
R53
P11
10K
1K
47K
1K
47K
220K
10K
47K
1K
220K
B20K
+G
+G
-G
-G
C32
C33
2n2
68n
+
+
+
-
-
-
5
3
3
6
2
2
8
7
7
6
1
4
4
IC1B
IC2
IC1A
CW
TO FX-in
Serial
Parallel
FROM FX-out
VOLUME
Reverb/
FX Mix
RHYTHM
VOLUME
REVERB
out in
reverb can:
Accutronics
4AB3C1B
to pwr amp
from preamp
IC1 - OP249
IC2 - TL071
IC3 - TL061
T1 - BD136
T2 - BD135
FX MIXER PAGE:
2 of 5
KOCH
GUITAR ELECTRONICS
Amersfoort
The Netherlands
DRAWN:
Dolf Koch
c
Copyright 2005, Koch Guitar Electronics
TWINTONE II
DATE:
25-07-2005
MARK
2.0
SERIAL NRS:
x1434 - x3070

br
pu
gy
gn
rd
bl
ye
R69
R77
R78
R79
R81
R72
R60
R68
R61 R66
R67
R65
R63 R64
R62
R80
R75
R76
R82
R70
R71
BIAS
R73 30-40mV DC
30-40mV DC
adjust with P13
(use matched
EL34s only)
R74
47K
2K2
220E
2W
100mH 22K
220E
2W
47K
100K
47K
470K 6K8
220E
120K
1W
1M 100K
1W
10K
1K
1K
5W
1K
5W
8E2
50W
220K
220K
1E
1W
1E
1W
+B
+B
+HT
+C
-F
C41
C42
C40
C43 C44
C45
100n
100n
100u
25V
33n 33n
470n
TX1
S1
8 3
1-8
1-8
72
5
5
4
4
6 1
3
3
V4B V4A
V5
V6
from fx mixer
SPEAKER
OUTPUTS
8 ohms
4 ohms
RECORDING
HEADPHONES
V4 - 12AX7
V5,6 - EL34
TX1 - VDV-G50
POWER AMP PAGE:
3 of 5
KOCH
GUITAR ELECTRONICS
Amersfoort
The Netherlands
DRAWN:
Dolf Koch
c
Copyright 2005, Koch Guitar Electronics
TWINTONE II
DATE:
25-07-2005
MARK
2.0
SERIAL NRS:
x1434 - x3070

P13
25K
CW
R93R92R91R90
R95
R94
R96
R100
R99
R98
Z2
Z3
Z4
R97
220E
5W
3K3
1W
3K3
1W
10K
220E
220E
33E
3W
22K
1K
470K
T0.5A
AT1.6
Ceramic
T0.5A
1K
+G+H +F
+F
-G -F
+HT+B+C+D+E
BIAS
C59C57C56
C54C53C52C51C50
C60
C62
C61
C58
C55
3300u
16V
100u
25V
1000u
16V
47u
450V
47u
450V
22u
450V
22u
450V
22u
450V
3300u
16V
100u
100V
4u7
100V
100u
25V
47u
450V
10V
40V
300V
TX2
gn
gn
gy
pu
gy
pu
4x
1N4007
2x
1N4007
1N4007
T3 - BC547
TX2 - TXM-50.4
STANDBY HT FUSE
filaments
V1- V4 V5-V6
42 57
9
Z1
230V - T1.6A
100/115V - T3.15A
MAINS
POWER
ye
115 V
230 V
100 V
rd
gy
bk
or
bn
100E 100E
C65 C66
C63 C64
R105 R106
100u
16V 100u 16V
6,5V
bl
bl
4x
1N4007
to filaments
V4-8
R107
0,47E
3W
15000u
10V 15000u
10V
to filaments
V1-3
POWER SUPPLY PAGE:
4 of 5
KOCH
GUITAR ELECTRONICS
Amersfoort
The Netherlands
DRAWN:
Dolf Koch
c
+HT
T3
Green Red
2K2 2K2
2K2
1M
R103 R104
R102
R101
STANDBY POWER
Copyright 2005, Koch Guitar Electronics
TWINTONE II
DATE:
25-07-2005
MARK
2.0
SERIAL NRS:
x1434 - x3070

R119
R124
R116
R122
R111
S2
R120
R113
R114
R110 R112 R118
R123
R115
R121
10K
10K
10K
10K
1K
1K
1K
1K
10K 10K 1K
1K
1K
1K
46
73
1
2
5
+R
+R REL 4
REL 1
REL 5
REL 2
REL 3
T4 T7
T8
T11T10
T5
T6
T9
T12
1N4148
1N4148
1N4148
1N4148
FOOTSWITCH
CHANNEL SWITCH
R117
10K
C73C71 10u10u
Rhythm VolumeReverb
LOGIC PAGE:
5 of 5
KOCH
GUITAR ELECTRONICS
Amersfoort
The Netherlands
DRAWN:
Dolf Koch
DATE:
25-07-2005
c
Copyright 2005, Koch Guitar Electronics
T4-12 - BC547
910
11
TWINTONE II MARK
2.0
SERIAL NRS:
x1434 - x3070