Big Muff PI 2

Electro-Harmonix founder and president Mike Matthews and serial inventor Bob Myer go way back. Together, they designed the very first Big Muff and had a working relationship throughout EHX’s history. Always innovating, Bob was known to present Mike with updated designs to keep up with available technology of the times. As the process goes, designs get selected and others get put aside and forgotten about. The Big Muff PI 2 dual op-amp design is one that didn’t make the cut back in the late 70s and was stashed away in Bob’s files. While interviewing Bob in his old workshop, EHX disciples Josh Scott and Daniel Danger uncovered this circuit design as a hand-drawn schematic among Bob’s notes. Josh decoded the original schematic and resurrected the circuit as the Big Muff PI 2.

Quick Specs

• Unique Big Muff PI circuit design employing 2 dual op-amps

• Artwork by Daniel Danger

• Volume, Tone, and Sustain controls

• True bypass

• Latching and momentary footswitch action

• 9v battery included, adapter optional