Koch TWINTONE III - Handbuch (Seite 4)

E N G L I S H
Thank you for choosing the TWINTONE-III from KOCH. You now own a "state-of-the-art" all-tube guitar amplifier of the highest quality.
The TWINTONE-III 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-III and also please fill in the warranty card and
mail it. Thanks and lots of succes with your new TWINTONE-III !
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 influences the CLEAN
channel but does not affect the Overdrive channel.
[2] VOLUME: Controls the volume level of the Clean channel.
[3] BASS, MID & TREBLE: Classic passive tone controls for the
Clean channel.
[4] GAIN BOOST: Selects Medium Gain for Crunchy sounds (down)
or High Gain for Lead sounds (up), in the Overdrive channel.
[5] GAIN: Controls the amount of distortion in the Overdrive channel.
A cleaner sound is achieved at lower settings (1-3). At middle
settings (3-6) the sound will get more distorted and harmonically
richer. At high settings (6-10) high-gain overdrive occurs with more
sustain and distortion.
NOTE: If the Gain Boost is switch on, squealing and/or
excessive hum and noise may occur at high Gain settings, due
to microphonic guitar pick-ups and insufficient screening of
guitar-circuitry.
[6] VOLUME: Controls the volume level of the Overdrive channel.
[7] BASS, MID & TREBLE: Classic post-distortion passive tone
controls for the Overdrive channel.
[8] PRESENCE: Controls the amount of boost in the upper mid
frequency range of both channels.
[9] RHYTHM: If activated with the FS-4 Footswitch, this master
volume control and can be preset at a lower rhythm level.
[10] SOLO: If activated with the FS-4 Footswitch, this master volume
control can be preset at a higher solo level.
NOTE: If the FS-4 Footswitch is not connected, the Solo Volume is
active.
[11] RED LAMP: Indicates that the Power Switch (back panel) is
switched on.
[12] STANDBY SWITCH: Allows the TWINTONE-III to be placed in
Standby or Active (On) mode. In Standby mode the tubes remain hot,
but the amplifier is not operational.
BACK PANEL FUNCTIONS
[1] POWER SWITCH: Turns AC power On (red lamp [11] on) and
Off (red lamp off). When the switch is Off the amplifier is completely
shut down.
NOTE: When switching the amplifier on, leave the Standby switch
[12] in “Standby” 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" [12] mode
and allow the amp to dim completely before switching the power off.
[2] 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.
[3] 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
the cause, the amp should be taken to a qualified service center for
repair.