Out of curiosity I pulled my @ehx Big Muff out and checked out the circuit board – I somehow lucked out and have an EC3003-A! Stands to reason I guess, love @franofrantone (who designed it) . I actually had two Big Muffs and gave one to a friend. I picked this one because the knobs were kind of cool (the other had hockey puck, which could also be an EC3003 version). I found the e-mail from ebay when I bought it (November of 2009) – $50! The one I gave away I paid $35 for.