Electro Harmonix Op Amp Big Mu ...

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Electro Harmonix Op Amp Big Muff Pi Fuzz


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Manufacturer's ID: OP AMP BIG MUFF

With original late-70s Op-Amp Big Muffs selling for 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 new 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 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, diecast package… pedalboard friendly
  • Ships with a 9Volt battery, also accepts an optional EHX9.6DC200 AC Adapter
  • Dimensions in inches: 2.75 (w) x 4.5 (l) x 2.1 (h)
  • Dimensions in mm: 70 (w) x 115 (l) x 54 (h)

Customer reviews

Overall Rating 5/5 (8 reviews)

Exactly the sound I’m looking for. Gives you the pumpkins fuzz sound

John O. - 7/4/2022

Gary L. - 29/1/2022

Carlos P. - 9/12/2020

Fantastic finding pedal, really captures that Smashing Pumpkins sound in all is variations. Sounds great paired with my Marshall DSL 5CR.

Simon L. - 20/8/2020

delicious fuzz - would recommend

Aniruddh O. - 12/6/2019

It's a great sounding effect, and the additional op-amp circuit gives you extra tonal options for not much more money than the basic version.

Amy F. - 15/4/2019

Fantastic pedal that I have wanted for a while now and when I noticed on GuitarGuitars instagram that it was back in stock in Glasgow I quickly went to purchase it on their website.

Clare F. - 23/4/2018

Actually laughed when I heard the sound as it was ridiculously awesome.

Stephen M. - 20/2/2018

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