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Electro Harmonix produced the Big Muff Pi Distortion/Sustainer as its flagship fuzz/sustain pedal, marketed under the BMUSA-U designation as the NYC-origin version of the circuit. The model carried a long production history, positioned throughout as the definitive Big Muff Pi in the Electro Harmonix line.
The unit operates as a distortion and sustainer pedal offering adjustable tone control. It ships with a 9-volt battery and accepts an optional external power supply (Electro Harmonix model 9DC-100). The circuit incorporates true bypass switching. Current draw is 100mA at 9VDC, and the enclosure measures 6.75" wide by 5.5" long by 2.0" tall.
Owners requiring service, internal inspection, or power supply compatibility verification should consult a qualified electronics technician experienced with effects pedals.
Nothing in The Vault is for sale. These records exist so the instruments stay documented after the manufacturer moves on — and the most useful part of that record is what owners add to it.
The catalog shot showed one finish, under one light, a long time ago. Yours has been played. Photos from owners are what the next person finds when they are trying to identify a part, match a finish, or work out whether the one they just bought is really what the seller said it was.
Specs only go so far. What actually fits, what breaks first, what the factory got right and what everyone ends up changing — that lives with the people who own them, not in a datasheet. Post what you know and it stays on this page for whoever comes looking next.
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Electro Harmonix
Electro Harmonix
Electro Harmonix
Electro Harmonix
Electro Harmonix
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From spec questions to full builds — players who have lived this gear since 2007.
Since 2007
