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Koch TWINTONE - User Manual

Koch TWINTONE
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TWINTONE
PRE-AMP
PAGE:
1of4
KOCH
GUITAR ELECTRONICS
Amersfoort
The Netherlands
DRAWN:
Dolf Koch
Copyright 1995, Koch Guitar Electronics
DATE:
march 2001
c
SERIAL 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
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Summary

Pre-Amp Section

Inputs

Selector for low and high impedance audio inputs.

Volume Control

Primary control for overall signal amplification level.

Drive Control

Adjusts the gain stage for overdrive and distortion characteristics.

Presence Control

Affects the high-frequency response and tonal character.

FX Loop and Reverb

FX Loop Interface

Interface for connecting external effects processors.

Reverb Volume

Adjusts the intensity of the reverberation effect.

Power Amp Section

Speaker Outputs

Terminals for connecting external loudspeaker cabinets.

Recording Output

Line-level output for connecting to recording equipment.

Headphone Output

Jack for connecting headphones for private listening.

Power Supply and Logic

Mains Power Input

Connection point for the main AC power supply.

Power Switch

Activates or deactivates the amplifier's main power.

Standby Function

Puts the amplifier into a low-power standby state.

Hum Balance Adjustment

Potentiometer to minimize hum noise from the power supply.

Summary

Pre-Amp Section

Inputs

Selector for low and high impedance audio inputs.

Volume Control

Primary control for overall signal amplification level.

Drive Control

Adjusts the gain stage for overdrive and distortion characteristics.

Presence Control

Affects the high-frequency response and tonal character.

FX Loop and Reverb

FX Loop Interface

Interface for connecting external effects processors.

Reverb Volume

Adjusts the intensity of the reverberation effect.

Power Amp Section

Speaker Outputs

Terminals for connecting external loudspeaker cabinets.

Recording Output

Line-level output for connecting to recording equipment.

Headphone Output

Jack for connecting headphones for private listening.

Power Supply and Logic

Mains Power Input

Connection point for the main AC power supply.

Power Switch

Activates or deactivates the amplifier's main power.

Standby Function

Puts the amplifier into a low-power standby state.

Hum Balance Adjustment

Potentiometer to minimize hum noise from the power supply.

Koch TWINTONE Specifications

General IconGeneral
Power Output50 Watts
Channels2
Frequency Response20 Hz - 20 kHz
EQ3-band (Bass, Middle, Treble)
ReverbSpring Reverb
Tubes4x 12AX7, 2x EL34

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