Guitar Aficionado

NAMM 2014: Colby Amplification Introduces the Mod Machine

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On the heels of Colby Amplification’s award-winning debut amp, the dual tone booster, the company has introduced the Mod Machine, a powerful amplification tool for recording, club gigs, practice and touring. The Mod Machine is an all-tube, hand-wired, British-style amplifier capable of multiple sounds and power amp configurations.

Starting from a full, clean sounding “JTM” circuit, the MOD MACHINE can morph to everything from a “Plexi” to a metal panel “Master Volume” to searing higher-gain sounds.

The power section includes four different modes (Pentode/Triode/Cathode/Fixed) for additional tonal options with corresponding power ratings from 12 to 50 watts or 22 to 100 watts, depending on the model. The all-tube FX loop has send and return level controls so you can connect time-based pedal and rack effects for maximum tone and flexibility.

The comprehensive MASTER section includes Pre and Post Master Volume controls as well as Presence and Hi Trim controls so you can dial in the right settings for low- and high-gains sounds and achieve the sound you are looking for at any volume level.

Other significant controls are the four-way pre-emphasis, three-way Shift switch and a switchable extra gain stage (STAGE 2). STAGE 2 also reconfigures the preamp for a tonal shift to a more modern sound and has its own Gain control which in conjunction with the Emphasis and Shift switches plus dual master volumes allows the user to dial in just about everything from clean to mean to scream.


Power: 12/22/36/50 watts (with two EL34s), 22/40/68/100 watts (with four EL34s)
Tubes: two or four EL34s, four 12AX7s
Front panel controls and switches: Volume, Treble, Mid, Bass, Stage 2 Volume, Pre Master Volume, Presence, Hi Trim, Post Master Volume, On/Off, Standby, Four-way pre Emphasis, Three-way mid Shift, Stage 2 On/Off, FX loop On/off
Back panel controls and switches: Mains and B+ fuses, Fixed/Cathode bias switch, Pentode/Triode switch, Main and Extension speaker outputs, Impedance Selector (4, 8 & 16), Send and Return Jacks, Send and Return level controls
Dimensions: (W) 24”, (H) 10”, (D) 9.5”
Weight: 35/37 lbs.

For more about Colby Amplification, visit