Bedienungsanleitung Koch TWINTONE II (Seite 4 von 13) (Deutsch, Englisch, Holländisch)

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E N G L I S H

Thank you for choosing the TWINTONE II from KOCH. You now own a "state-of-the-art" all-tube guitar amplifier of the highest quality.

The TWINTONE II has been designed and built by people who - from their own experience as musicians - take guitar sound and quality

very seriously. That is why this product was designed and built with the utmost care in order to meet all professional standards. Our

goal was not only to design an amp which sounds fantastic and is easy to operate, but also to build it in such a way that it will serve you

loyally for many years to come.

Please take your time to read this manual carefully before you switch on the TWINTONE II and also please fill in the warranty card and

mail it. Thanks and lots of succes with your new TWINTONE II !

CAUTION:

* BEFORE PUTTING INTO OPERA-

TION READ THESE OPERATING

INSTRUCTIONS CAREFULLY.

* NO USER SERVICEABLE PARTS

INSIDE.

* REFER SERVICING TO

QUALIFIED SERVICE

PERSONNEL ONLY.

WARNING:

* TO REDUCE THE RISKS OF ELECTRICAL

SHOCK, DO NOT REMOVE THE COVER.

* TO REDUCE THE RISK OF FIRE OR

SHOCK HAZARD, DO NOT EXPOSE

AMPLIFIER TO RAIN OR MOISTURE.

* THIS APPARATUS MUST BE EARTHED.

* TUBES ARE HOT.

DO NOT TOUCH DURING OPERATION.

FRONT PANEL FUNCTIONS

[1] INPUTS

NORMAL - Input for standard instruments, e.g. guitars with single-

coil pickups.

BRIGHT CLEAN - Input for high-output instruments, e.g. guitars

with humbucker pickups. This input has 6dB gain reduction to

prevent overload of the input stage and a filter which compensates

guitar cable losses by boosting the high frequencies as of 3Khz.

(Due to their higher coil impedance, humbucker pick-ups suffer

more from cable losses than single-coils, which may result in lack

of sparkle in the clean sound)

NOTE: The BRIGHT CLEAN input only changes the CLEAN

channel but does not affect the OD and the OD+ channels.

[2] CHANNELS SWITCH: Selects the Clean, the OD (OverDrive)

or the OD+ channel if the Footswitch is not connected.

[3] VOLUME: Controls the volume level of the Clean channel.

[4] BASS, MID & TREBLE: Classic passive tone controls for the

Clean channel.

[5] GAIN: This ‘Dual-Gain’ is a very powerful feature combining

Drive (OD) and Gain Boost (OD+) in one knob. It has been

achieved by controling the amount of amplification in the Overdrive

Channel preamp, in one stage of the OD channel and in two

stages simultaneously of the OD+ channel. Thus garanteeing a

well dimensioned boost when switching from OD to OD+ in every

position of the Gain knob.

Cleaner sound is achieved at lower settings (2 to 4), at middle

settings (4 to 6) medium overdrive occurs which will produce more

sustain and a subtle distortion. At high settings (4-10) mega

overdrive occurs, adding loads of sustain and compression.

Accurate pre and post shaping circuitry prevent the low end from

getting muddy even at the highest Gain settings in the OD+

channel.

NOTE: High GAIN settings in the OD+ channel may cause

squealing and/or excessive hum and noise, due to

microphonic guitar pick-ups and insufficient screening of

guitar-circuitry.

[6] VOLUME: Controls the volume level of the OD and the OD+

channels.

[7] PRESENCE: Controls the amount of boost in the upper mid

frequency range of the Overdrive channel.

[8] BASS, MID & TREBLE: Classic post-distortion passive tone

controls for the Overdrive channel.

[9] STANDBY SWITCH: Allows the TWINTONE II to be placed in

Standby (green LED off) or Active (green LED on) mode. In

Standby mode the tubes remain hot, but the amplifier is not

operational.

The green LED monitors the internal HT power supply for the

tubes. If the amp is switched from the Active to the Standby mode,

the green LED slowly dims indicating that the HT power supply

slowly loses power. The TWINTONE II remains (partly) operational

until the LED is completely off.

[10] POWER SWITCH: Turns AC power On (red LED on) and Off

(red LED off). When the switch is Off the amplifier is completely

shut down.

NOTE: When switching the amplifier ON, leave Standby switch [9]

in “Off” position for 5-10 seconds thus allowing the tubes to heat up

before switching to the Active mode. When switching the amplifier

OFF, first select Standby [9] mode and allow green LED to dim

completely before switching Power off.

REAR PANEL FUNCTIONS

[1] A.C. POWER:

INPUT - Power cord input. The amp is equipped with a worldwide

power supply. Inside the amp a mains selector switch can be set

on one of three voltages, 100, 115 or 230. Either of these voltages

will work worldwide with minor power differences. The amp will

work on either 50 or 60 hertz. After resetting the internal mains

selector switch make sure fuses are replaced with printed

ratings on rear of amp.

FUSE - Both fuse and spare fuse are located on the sled of the

fuseholder. Fuse sled can be removed with a screwdriver. If the

fuse should fail, it must be replaced with the same type and

value in order to avoid damage to the amp and to prevent

voiding the warranty.

If the amp repeatedly blows fuses, check for a bad power tube. If

tube-failure is not the cause, the amp should be taken to a

qualified service center for repair.

WARNING: Only a qualified technician should attempt an

input voltage change. Personel injury or equipment damage

may occur if done incorrectly.

WARNING: The fuse should be replaced or the voltage should

be reset only when the power cord has been disconnected

from its power source.

[2] HT FUSE: This fuse protects the power supply in case of tube

failure. If it blows, check for a bad power tube. If tube-failure is not

Koch TWINTONE II Seite 4

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