Item #1420657 Model #OP-AMP

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


Out of stock
Pickup In-Store

This item is backordered but it is available to reserve now. You will not be charged until the item ships.

Email me when in stock

Save to Wishlist

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—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 9Volt battery, also accepts an optional EHX9.6DC-200 AC Adapter