Koch TWINTONE Quick start guide

TWINTONE
PRE-AMP PAGE:
1of4
KOCH
GUITAR ELECTRONICS
Amersfoort
The Netherlands
DRAWN:
Dolf Koch
Copyright 1995, Koch Guitar Electronics
DATE:
march 2001
cSERIAL NRS:
x631 - x760
MARK:
4.0
REL1
to fx mixer
R2
R1
R16
R30
R21R17
R3
R31
R32
R11
R15
R26
R10
R20
R14
R22
R25
R6
R29
R4
R23R18
R8
R27
R12
R5
R24
R19
R9
R28R13
P5-B
P5-A
P1
P6
P2
P7
P4
P10
P9
P3
P8
68K
68K
220K
470K
470K220K
1M
100K
1W
220K
33K
470K
470K
220K
220K
470K
470K
470K
100K
33K
100K
1W
100K
1W
100K
1W
100K
1W
100K
1W
150K
1W
1K5
1K51K5
1K5
820
1W
2K7
470KG
470KG
220KN
220KN
220KG
1MG
1MG
220KG
1MN
22KN
22KN
+E
+D+E
+D
+D+E
C5
C14C7
C10
C11
C3
C17
C2
C16
C4
C18
C9
C13
C19
C20
C1
C12
C6
C15
C8
100n
47n
47n 470p 4n7
100n
22n
270p
470p
47n
22n
470p
470p
270p
4n7
22u
470n
22u
22u680n
3
33
8
88
2
22
7
77
1
11
6
66
V1A
V3A
V2A
V2B
V3B
V1B
CW
CW
CW
CW
CW
CW
CW
CW
CW
CWCW
TREBLE
BASS
MID
TREBLE
BASS
MID
low
INPUTS
high
VOLUME
DRIVE PRESENCE VOLUME
V1 - 12AX7WA/EH
V2,3 - 12AX7

IC1 - OP249
IC2 - TL071
IC3 - TL061
T1 - BD136
T2 - BD135
R52
R46
R47
R50
R51
R48
R49
33
2W
10K
1K
470K
6K8100K
6K8
+F
-F
C25
C26
68n
100n
-
+
2
3
7
6
4
IC3
T1
T2
REL2
P11
25K
CW
R45
R41
R55
R42
R40
R54
R43
R44
R53 P12
10K
1K
47K
47K
220K
10K
47K
1K
220K 20KN
+G
+G
-G
-G
C27
C28
2n2
33N
+
+
+
-
-
-
3
3
5
2
2
6
8
7
1
6
7
4
4
IC1B
IC2
IC1A
CW
TO FX FROM FX
REVERB
VOLUME
MASTER
VOLUME
REVERB
out in
reverb can:
Accutronics
4AB3C1B
to pwr amp
from preamp
TWINTONE
FX LOOP, REVERB PAGE:
2of4
KOCH
GUITAR ELECTRONICS
Amersfoort
The Netherlands
DRAWN:
Dolf Koch
c
MARK:
4.0
Copyright 1995, Koch Guitar Electronics
DATE:
march 2001
SERIAL NRS:
x631 - x760

TWINTONE
POWER AMP PAGE:
3of4
KOCH
GUITAR ELECTRONICS
Amersfoort
The Netherlands
DRAWN:
Dolf Koch
c
MARK:
4.0
Copyright 1995, Koch Guitar Electronics
DATE:
march 2001
SERIAL NRS:
x631 - x760
br
pu
gn
rd bl
ye
R68
R77
R78
R79
R81
R71
R60
R63
R61 R66
R67
R65R64
R62
R80
R74
R75
R76
R69
R70
BIAS
R72
30-40mV DC
30-40mV DC
adjust with P13
(use matched
EL34s only)
R73
47K
2K2
220
2W
100mH 22K
220
2W
47K
100K
47K
470K 6K8
220
120K
1W
100K
1W
10K
1K
1K
5W
1K
5W
8R2
50W
220K
220K
1R
1W
1R
1W
+B
+B
+HT
+C
-F
C41
C42
C40
C43 C44
C45
100n
100n
100u
25V
33n 33n
470n
TX1
83
1-8
1-8
72
5
5
4
4
61
3
3
V4B V4A
V5
V6
from fx mixer
SPEAKER
OUTPUTS
8 ohms
4 ohms
RECORDING
HEADPHONES
V4 - 12AX7
V5,6 - EL34
TX1 - TXO-50.1

T3,4 - BC550
TX2 - TXM-50.3
Z1
230V - T1.6A
115V - T3.15A
MAINS
POWER
ye
115 V
230 V
100 V
rd
gy
bk
or
bn
TWINTONE
POWER SUPPLY, LOGIC PAGE:
4of4
KOCH
GUITAR ELECTRONICS
Amersfoort
The Netherlands
DRAWN:
Dolf Koch
c
MARK:
4.0
Copyright 1995, Koch Guitar Electronics
DATE:
march 2001
SERIAL NRS:
x631 - x760
P14
P13
100R
22K
CW
CW
R93R92R91R90
R94
R95 R96
R98
R97
R101 R102
Z2
Z3
Z4
R99 R100
220
5W
3K3
1W
3K3
1W
10K
220
220
3R3 5W
22K
1K
10K
C53
2n2
C54
2n2
10K
T0,5A
T1,6A
T0,5A
1K 1K
+G +F -G to filaments V1 -F
+HT+B+C+D+E
+F
BIAS
C49C46
C44C43C42C41C40
C50
C52C51
C47
C48
C45
3300u
16V
100u
16V
47u
450V
47u
450V
22u
450V
22u
450V
22u
450V
3300u
16V
100u
100V
4u7
100V
100u
16V
3300u
16V
47u
450V
REL1
12VDC
REL2
12VDC
6,5V
10V
40V
300V
TX2
gn
gn
gy
pu
bl
gy
pu
bl
T3 T4
4x
1N4007
to filaments V2-6
2x
1N4007
1N4007
1N4007 1N4007
STANDBY
HUM
BALANCE
MANUAL
FOOTSWITCH
filaments
V2- V4 V5-V6
42 57
9
V1
45
REPLACE WITH:
250R