The Dallas-Arbiter Fuzz Face has been around since 1966, and shows no signs of dying any time soon. Through the design's past you'll find all kinds of different variations in the basic original circuit, from PNP Germanium to NPN Silicon, and a countless number of fuzz pedals that are based on it.  The Fuzz Face has been played by almost every famous guitar player that has ever lived, and will proberly continue for years to come!