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“The Op-Amp Big Muff was popularized by the brilliant Billy Corgan who first used it on the Smashing Pumpkins’ epic 1993 album Siamese Dream. After he was videotaped playing and talking about the reissue, Billy stated: ‘The magic’s still in the box, I can still get what I’m looking for!’” – Mike Matthews

The pedal relies on op-amps rather than transistors and three gain stages rather than four, to create its signature sound. It’s a sound that’s been described by noted Big Muff collector and historian, Kit Rae, as: “a huge, crushing Big Muff sound with more crunch… great for grungy, wall-of-sound distortion, heavy rhythm playing and heavy leads.”

  • A faithful reissue of the original classic circa 1978
  • Iconic sound and vibe that’s coveted by guitarists
  • Controls for Tone, Sustain and Volume, plus a Tone Bypass switch
  • True bypass switching for maximum signal integrity in bypass mode
  • Rugged, compact, die-cast package… pedalboard friendly
  • 9V battery included


Circuit                                                  Analog

Bypass                                                True Bypass

Audio                                                    Mono

Power Supply                                   9V battery included (optional                                                                                  9.6VDC-200mA power adapter not                                                                      included)

Dimensions (in)                                4.5 x 2.75 x 2.1

Current Draw                                    5mA

Year Released                                  2017

UPC                                                      683274012087

Electro-Harmonix Op Amp Big Muff Pi Effects Pedal

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