The Electro-Harmonix Big Muff is one of the all time classic effects pedal. Creamy, huge, fuzz that is absolutely unique and unmistakable. There have been many versions, as you know, but this one stands out as unique. Using op-amps to produce the biting fuzz, the famed big box, red/black Big Muff Pi has a cutting, square wave style fuzz that's still a Muff but has its own voice. Featured prominently on the Smashing Pumpkins' Siamese Dream album, the aggressive voice of this pedal still maintains lots of warmth and wraps your tone up in a fuzzy blanket.
This vintage unit has the toggle for bypassing the Tone stack which provides a more in-your-face attack.
Own a piece of music gear history and grab this unit for your collection...or hell, throw it on your board; it's ready for stage or studio. It shows signs of its age and use but functions perfectly. It'll ship out securely and safely the next day.