Tube amplifiers operate at high voltages which may cause property damage, serious injury or death. Proceed at your own risk. The content on this website is intended for informational purpose only.

Guitar Amplifier Schematics

Free Guitar Amp schematics in PDF format.

2W Tube Guitar Amplifier, 12AX7 & 12L8GT Single Ended

This is a low power Guitar tube amp suitable for practicing, recording or miking through a PA system. The preamp circuit and features are similar to those on a Fender Tweed era Princeton: Single Channel, Volume and Tone knobs.

The 12L8GT output tube used is pseudo exotic, but full of sweet tone. It is a dual pentode in a single bottle with an octal base. In this circuit the two sections work in parallel single ended. Gibson did something similar in a version of their Gibsonette, except they used 6V6GT.

I built mine as a head, but it could easily be built as a combo. 2W can be surprisingly loud. This is not a "bedroom amp" unless you equip your speaker with an L-pad or similar circuit. Use link below for the PDF schematic.

2W Tube Guitar Amp Schematic

5W Tube Guitar Amplifier, 12AX7 & EL84 Single Ended

Almost identical circuit to the 2W amp, except output tube is a single ended EL84 (6BQ5). This is a fairly typical design that resembles entry level amps from the 1960's. Loads of tone.

5W Tube Guitar Amp, 12AX7 & EL84 SE Schematic

5 watt guitar amp head photo5W Guitar Amp Head

5W Tube Guitar Amplifier, 12AX7 & 6V6GT Single Ended

Almost identical circuit to the EL84 amp, except output tube is a single ended 6V6GT. Very similar to a Fender Champ (5F1). The biggest difference is the rectifier - the schematic is drawn with a solid state diode rectifier in place of the 5Y3 tube used in the day. Tone difference? Sure, everything sounded better back then...

5W Tube Guitar Amp, 12AX7 & 6V6GT Schematic

› Guitar Amp Schematics

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