Rumble Guitar Amp

Rumble is my modified version of an internet schematic of the 1970's Dumble Overdrive Guitar Amplifier.

I've changed the toggle switches to push switches, use Edcor-USA Transformers, added some circuit mods I thought were necessary and added a "Hum Balance" control for the Vacuum Tube heater voltage.

*

Two 12AX7 tubes comprise the preamp and overdrive circuits with switchable controls for choosing Rock or Jazz style tone as well as passive Tone Stack.

A third 12AX7 serves as the Phase circuit. Output is a push-pull design using EL84 Power Amp Tubes.

*

I added an EMI/RFI circuit to reduce any power supply interference and cut noise.

Circuit and board are unverified at this time.