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3CP1 (2004)

2004_3cp1
The 3CP1 was a single-channel guitar amplifier primarily designed to deliver woody, vocal, open, bold classic and rock British overdrive sounds. The preamp of this 3CP1 used two 12AX7 tubes and was approximately 10W (SE class A) using a single output tube.

Front panel controls

Low, Mid, High knobs to shape the voicing of the EQ.

Master Volume control for the overall volume of the amplifier.

Gain control for the overdrive/gain level.

Boost switch which allows for lower gain drive or plexi clean sounds, to medium gain sounds, to medium/high gain sounds. The center position of this switch is the lowest gain sound. The lower setting of this switch provides the first level of gain boost. The upper setting of this switch is for the more pronounced gain boost.

Rear panel controls

8/16 ohm impedance selector switch, two parallel output jacks.

Tubes

2x 12AX7 preamp tubes

1x EL34 output tube

Can also use 6L6, KT66, KT88, 6550, 6CA7 as the output tube. When using 6L6 or KT66 types, it’s recommended to double the impedance the amp sees (hook a 16 ohm cab to the amp using the amp’s 8 ohm setting). It’s safe to use without doing this but this will result in the optimum sound/feel intended for this model.

JJ 6V6 can be used but no other 6V6 type should be used. Double the impedance as recommended above if using a JJ 6V6.

There is no bias adjustment required for different output tubes. (The amplifier’s output section is self-biasing.)

Removable protective bar

The metal bar on the back of the amp uses two thumbscrews to hold it in place.

Fuse ratings

Mains: 2A Slo Blo

HT: 0.125A (1/8A) fast acting

Both fuses should be rated for 250V.

Note: This document refers to the 2004 3CP1 model only. The 2002 model had a different overall sound and some different features/specifications. Do not use this document as reference for the 2002 3CP1 model.