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Owner's Manual

MM12/50, MM22/100

"MOD MACHINE"

Welcome to Colby Amplification. We share something in common; we care deeply about tone. After 40

years of playing guitar and a 40 year career based around guitar amplifiers, I started Colby Amplification

with a desire to produce the very best possible tube guitar amplifiers. Colby amplifiers have been

designed with tone as the number one focus, period. Everything possible is done to keep the signal path

pure, all tube, and sounding great. There is and will never be a compromise when it comes to tone.

The MOD MACHINE was conceived as an amp that could produce many great British sounds. I know

British amps. I worked for the US distributor of Marshall for 32 years and have been collecting amps for

longer than that. I've been to the UK many times and scoured music stores for vintage treasures. I also

had friends in the UK searching. I was lucky because I had an easy way to ship amps to the US (in

containers with the Marshalls we were distributing).

MOD MACHINE was tweaked for over a year until the goal was achieved: be able to produce everything

you want and need if you are looking for an amp that can recreate many of the big British sounds

produced by different designs starting from 1962. The MOD MACHINE is a single channel amp that

offers the full clean sound of an early to mid 1960s four input amp, the cutting clean sound from a 1970s

four input, and just about every overdriven sound from the 1960s to the Master Volume amps of the

1970s and 1980s to the higher gain amps of the 1990s and later. It's got the right amount of detail,

compression, note body, smooth or aggressive overdrive all with the turn of a few knobs and front panel

switches.

The word MOD is a great adjective for this amp since it can be reconfigured to sound like so many

different amps with the turning of two front panel rotary switches and a few controls.

By incorporating a finely tuned additional gain stage (STAGE 2) the MOD MACHINE can go from super

clean to high gain overdrive and sound great at the extremes and in between. The addition of power

amp Pentode/Triode and Fixed/Cathode bias switches allows you to lower the power from maximum to

about ¼ of full power in four increments. These switches create differences we can use for greater

possible variation in tone and feel.