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Electro-Harmonix Electro-Harmonix

Electro-Harmonix Op-Amp Big Muff Pi Fuzz Effects Pedal

96.2 $96.20
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Get amazing vintage Big Muff sound in a modern-day package.

With original late-'70s Op-Amp Big Muffs commanding exorbitant prices, Mike Matthews decided to take the power to the people and reissue the classic pedal at a price that players could afford. The circuitry of the Op-Amp Big Muff fuzz effects—sometimes also referred to as the IC or V4 Big Muff—has been faithfully re-created while several practical enhancements have been added, including a compact, die-cast chassis and true-bypass switching.

The pedal relies on op-amps rather than transistors and three gain stages rather than four to create its signature sound. The original Op-Amp Big Muff has many devotees, including Billy Corgan, who made use of it extensively on the Smashing Pumpkins’ 1993 album Siamese Dream. After playing the new reissue, Billy said: “The magic’s still in the box; I can still get what I’m looking for!”


  • 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
  • Ships with a 9V battery, also accepts an optional EHX9.6DC-200 AC adapter (sold separately)

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