1972 Electro-Harmonix EHX Big Muff Pi Triangle V1 Guitar Fuzz Effect Pedal FS36999 PreownedWelcome to All Music Inc! Right now, you are looking at an insanely cool and rare effects pedal. This is the 1972 Big Muff Pi 'Triangle' V1 guitar fuzz effect pedal. Featuring the mystical and highly sought after FS36999 silicon transistors. The mysterious FS36999 has become legendary in Big Muff lore as the most desirable of all silicon transistors. This is part of what makes this pedal extremely rare that at least 2 out of the 4 transistors (that I