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EC DECLARATION OF CONFORMITY
We, Koch Guitar Electronics, Arnhemseweg 152, Amersfoort, The Netherlands, declare
under our sole responsibility that the product:
63'OD
Guitar Floor Amplifier
to which this declaration relates is in conformity with the following harmonized
standards:
* EN 50081-1 (1991)
Electromagnetic compatibility. Generic emission standard.
Part 1: residential, commercial and light industry;
* EN 50082-1 (1991)
Electromagnetic compatibility. General immunity standard.
Part 1: residential, domestic and light industrial environment;
* EN 60065-1 (1993)
Household electronic apparatus.
Part 7: Heating under normal operating conditions;
* EN 60335-1 (1988)
Safety of household and similar electrical appliances.
Part 1: general requirements.
Following the provisions of Council Directive 98/336/EEC on the approximation of the
laws of the Member States relating to electromagnetic compatibility and the provisions
of Council Directive 73/23/EEC on the approximation of the laws of the Member States
relating to low voltage and electrical safety.
Amersfoort, 1 August 2014
D.M. Koch
Congratulations on your purchase of this unique preamp. The 63'OD was designed for those who need a wide palet of tube
sounds at the tip of their toes both for performing as for recording purposes. This unit is road-proof and built by people who care
about guitar tone and quality.
Please take your time to read this manual carefully before you switch on the 63'OD and also please fill in the warranty card and
mail it. Thanks and lots of success with your new 63'OD!
CAUTION:
*
BEFORE PUTTING INTO OPERATION READ
THESE OPERATING INSTRUCTIONS
CAREFULLY.
*
NO USER SERVICEABLE PARTS INSIDE.
*
REFER SERVICING TO QUALIFIED SERVICE
PERSONNEL ONLY.
63'OD PANEL FUNCTIONS
[1] CLEAN VOLUME: Controls the volume level of the Clean
channel (CH1).
[2] OD GAIN: Controls the amount of distortion in the
Overdrive channel (CH2).
[3] OD VOLUME: Controls the volume level of the Overdrive
channel (CH2).
[4/5/6] BASS, MID & TREBLE: Classic passive tone controls
that regulate low, middle and high frequencies of both
channels.
[7] CLEAN/OVERDRIVE: Selects between the Clean channel
(CH1) and the Overdrive channel (CH2). The red LED
indicates that the Overdrive channel is active.
[8] OD GAIN BOOST: If the Overdrive channel (CH2) is
active [7], this switch selects medium Gain or high Gain. The
red LED indicates that high Gain is active.
NOTE: If CH2 BOOST is on, squealing and/or excessive hum
and noise may occur, due to microphonic guitar pick-ups
and/or insufficient screening of guitar circuitry.
[9] GUITAR INPUT: Input for an electric guitar.
[10] LIFT/GND SWITCH: Connects or disconnects pin 1 from
the XLR connector [11] to ground. Can be used to eliminate
hum caused by a ground-loop.
[11] DI OUTPUT: This XLR connector provides a 600 ohms
fully balanced direct output for recording or PA.
The signal is filtered by a special filter which simulates the
sound picked up by a microphone in front of a guitar speaker,
so it can be fed directly into a recording or sound
reinforcement mixer.
This filtered output signal is at line level (-10dBV).
[12] MONITOR OUTPUT: This jack connector provides an
unfiltered output signal which can be set at three different
output levels with the selector switch [13].
[13] LEVEL SELECTOR: Selects the output level of the
MONITOR Output [12] and can be set to:
0dBV/TO POWER AMP: For connecting the 63'OD to a
separate (19") power amp with 0dBV input level.
-10dBV/TO FX RETURN: For connecting the 63'OD to the FX
Return connector of a guitar amplifier.
RE-AMP/TO CLEAN INPUT: For connecting the 63'OD to the
input jack of a guitar amplifier. If this amp has a channel
selector it must be set to the Clean channel.
5
E N G L I S H
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 UNIT TO RAIN OR
MOISTURE.
[14] PRE FX LOOP: For connecting effect units at the front
side of the 63'OD, between the guitar and the preamp's input.
Well suited for sound shaping effects like a Wah-Wah or an
extra distortion pedal.
[15] POST FX LOOP: For connecting effect units at the end
of the 63'OD, between the preamp's output and the Monitor
and DI connectors.
Well suited for delay type effects like a chorus or echo unit.
[16] REMOTE CONTROL: This stereo jack can be used to
switch Channels [7] or Gain Boost [8] externally with an FS2
foot pedal or a MIDI switcher. For connecting a MIDI switcher
a stereo cable must be used.
[17] MAINS ADAPTER: Input for the included external
12VAC mains adapter.
[18] PSU OUTPUT: Provided for feeding effect units with 9
Volts up to a maximum of 200mA total current.
NOTE: Most analogue effect units draw little current (5-
20mA). Most digital effects units draw much more current (50-
150mA).
REPLACING THE TUBE
SAFETY FIRST: DISCONNECT THE MAINS ADAPTER
FROM THE 63'OD AND LET THE HOT TUBE COOL.
REPLACE TUBE ONLY WITH AN ORIGINAL KOCH
12AX7. (IF OTHER TUBES ARE USED THE
WARRANTEE OBLIGATION EXPIRES)
BEFORE REPLACING THE TUBE REMOVE THE TOP.
AFTER REPLACING THE TUBE PUT THE TOP BACK
IN PLACE.
Preamp tubes wear out and have to be changed from time to
time to maintain the 63'OD's best performance. Tubes behave
like strings, they lose highs, lows and dynamics and after a
period of time they have to be changed.
Tubes rarely fail. If they are bad, these might be the
symptoms:
-
Microphonic whistling or squealing on one or both
channels.
No or low amp volume on one or both channels.
-
-
Excessive noise on one or both channels.
Changing a tube is a simple and quick fix for most problems in
your 63'OD.
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