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Electro-Harmonix Op-Amp Big Muff Pi Distortion/Sustainer Effects Pedal


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MSRP: Old Price $107.50 Discounted Price $80.60 Save : $26.90 (25%)
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MSRP: Old Price $107.50 Discounted Price $80.60 Save : $26.90 (25%)
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Electro-Harmonix has reissued their late-70s era Op-Amp Big Muff Pi that was popularized by Billy Corgan of the Smashing Pumpkins during the early 90s. Sometimes also referred to as the IC or V4 Big Muff, the original circuitry 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. 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."

The Op-Amp Big Muff Pi features standard controls: Sustain, Tone and Volume, plus a Tone toggle switch for bypassing the tone circuit. It comes equipped with a 9V battery or can be powered by an optional 9-volt AC adapter.

Order your Electro-Harmonix Op-Amp Big Muff Pi Distortion/Sustainer Effects Pedal today at the guaranteed lowest price from Sam Ash Direct with our 45-day return and 60-day price protection policy.

Things You Will Get:

  • Effect Pedal
  • Manual

Siamese Dream in a pedal


Sounds so good. Perfect for that Smashing Pumpkin's style guitar tone.



Smashing Pumpkins in a box


I love this pedal. I'll say it again. I LOVE THIS PEDAL. I have been such a huge fan of the Smashing Pumpkins for so many years. This is literally the gateway to the early years of Mr. Corgan's tone. This will give you the thick and creamy fuzz tone you've been Siamese Dreaming of. This pedal uses an op amp circuit which allows higher input impedance, lower output impedance, and higher gain than a circuit built on transistors.



Op-Amp Big Muff Pi Distortion/Sustainer Effects Pedal

5.0 2


Model Op-Amp Big Muff Pi
Warranty Info:

The manufacturer's warranty covers parts for one year and labor for one year from date of purchase. The warranty excludes damage from misuse, abuse, and contains other exclusions.

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