Modern day distortion converts may associate this box with the buzz-saw crunch of bands like The Smashing Pumpkins and Dinosaur Jr but the classic Big Muff sound IS the the sound of the 70s. From that midly distorted Satana-like sustain to the flat wooly fuzz of Thin Lizzy, this box practically defined the guitar sound of a decade. It's an unmistakable sound with its' rich harmonic overtones, string-like sustain, and "she's breaking up" quirkiness. Numerous versions of Silver Box Big Muff PI exist in the form of the older Series 1, Series 2, Series 3 models all the way to the newer NYC Re-issues. The overall sound, components, and quality vary a bit from version to version so shop around for one that suits your style. Also be sure to take the time to fine tune the Big Muff, as it can produce everything from boomy low-end to bee-swarm treble and everything in between.