Op Amp Big Muff-Fuzz/Distortion/Sustainer-Faithful Re-creation of the Late-70's Op Amp Big Muff Pi

The Legendary Op-Amp Big Muff Returns

The EHX Op-Amp Big Muff Pi is a faithful reissue of the iconic 1978 original—sometimes referred to as the IC or V4 Big Muff. This legendary fuzz pedal was popularized by the brilliant Billy Corgan, who first used it to create the massive, saturated tones on the Smashing Pumpkins' epic 1993 album Siamese Dream.

Iconic Sound, Modern Enhancements

The circuitry has been faithfully re-created to deliver that coveted vintage sound and vibe that guitarists have been chasing for decades. While staying true to the original, Electro-Harmonix has added several practical enhancements including a compact, die-cast chassis and true bypass switching for maximum signal integrity.

Premium Features

• Tone control - Shape your sound from dark and brooding to bright and cutting
• Sustain control - Dial in everything from light overdrive to massive, sustaining fuzz
• Volume control - Plenty of output to push your amp or cut through the mix
• Tone Bypass switch - Engage for full-range fuzz or bypass for scooped mids
• True bypass switching - Preserves your tone when the pedal is off
• Rugged die-cast chassis - Compact and pedalboard-friendly design built to last

Specifications

• Circuit: Analog
• Bypass: True Bypass
• Power: 9V battery included (also accepts standard 9V adapter)

Perfect For:

• Alternative rock and grunge tones
• Thick, saturated lead sounds
• Vintage fuzz enthusiasts
• Smashing Pumpkins fans seeking that Siamese Dream sound
• Guitarists who demand authentic vintage tone with modern reliability

Whether you're recreating classic '90s alternative rock or forging your own sonic path, the EHX Op-Amp Big Muff Pi delivers the legendary fuzz tone that has defined generations of guitar music. Experience the sound that helped shape modern rock.