Electro-Harmonix
Op-Amp Big Muff Pi Distortion/Sustainer
Op-Amp Big Muff Pi Distortion/Sustainer
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This listing is for a brand new pedal. Professor Nigel's is an authorized Electro-Harmonix dealer.
Professor’s Notes
The Op-Amp Big Muff Pi recreates the late-’70s “IC” Muff circuit made famous by Billy Corgan on Siamese Dream. It’s punchier and more aggressive than transistor-based Muffs, offering a distinctive fuzz character that stands out in a mix — all in a compact, affordable package.
Description
The Electro-Harmonix Op-Amp Big Muff Pi Distortion/Sustainer is a faithful reissue of the original late-1970s op-amp-driven Big Muff, long prized by collectors for its unique sound. Unlike traditional transistor-based Muffs, the op-amp design delivers:
- More attack and clarity in the midrange.
- Tighter low end with less “wooliness.”
- Aggressive sustain that cuts through dense mixes.
Controls for Volume, Tone, and Sustain keep operation simple, while a Tone bypass switch allows players to lift the tone circuit entirely for extra raw output and presence.
Compared to vintage units — now scarce and expensive — the reissue brings the same iconic fuzz at a fraction of the cost, with modern reliability and a pedalboard-friendly size. Whether chasing Billy Corgan’s Pumpkins-era sound or just looking for a more articulate Muff, the Op-Amp Big Muff Pi delivers.
Specifications
- Type: Analog fuzz/distortion pedal (op-amp circuit)
- Controls: Volume, Tone, Sustain, Tone Bypass switch
- Bypass: True Bypass
- Audio: Mono input/output
- Power: 9V battery included or optional 9VDC power supply (not included)
- Current Draw: ~3mA
- Dimensions: 4.75" x 4" x 2.25"
What’s Included
- Electro-Harmonix Op-Amp Big Muff Pi pedal
- 9V battery (installed)
- Original packaging









