The Dual Transistor Fuzz (DTF) is a guitar pedal created by Voltic Electronics, a business split between Delaware, Philadelphia and New Jersey. It's based on the HP-2 circuit designed by Dan Weiss of Interfax Electronics, also known as "Harmonic Percolator." The DTF uses a PNP 2N404A germanium transistor and NPN 2N3565…... Click for more