Built in the image of the coveted late '70s models made famous on the Smashing Pumpkins' enormous album Siamese Dream, the Electro-Harmonix Op Amp Big Muff Reissue Fuzz summons iconic '90s snarl in a compact chassis. Renowned for its enormous, biting presence thanks to the presence of op-amps instead of transistors and three gain stages instead of four, this much-demanded Big Muff is a fast, affordable avenue to the vicious tone of a company classic.