Electro Harmonix Big Muff Pi 1974 Rams Head Version
Circa 1974 this "Rams Head" Big Muff Pi is one of the best sounding fuzz units with loads of gain to do anything from Pink Floyd, to Santana, to Smashing Pumpkins! This unit features a on/off battery switch and the only modification is a hole in the base of the unit to access the battery clip.
The "Rams Head" Era pedals have a scooped sound with a huge range of gain. Many consider this the most iconic version of this much talked about pedal.