“Electro-Harmonix Ram’s Head Big Muff Pi with 1974 pot dates and 2N5133 transistors (what the re-labeled FS36999’s probably were according to Mike Matthews himself). Exceptional fuzz tone with fantastic sustain and a huge, smooth bottom end. It’s also the quietest I’ve heard – minimal circuit noise for a Ram’s Head. More great information on this version of the Muff as well as all others can be found here.”
“Off” is now added above the switch. It is possible that the knobs seen in this photo are “after market” knobs and not original EH knobs.