Wren and Cuff Eye See '78Talking shop about Muff style fuzz with any guitar player that knows his or her stuff is a relatively straightforward conversation. Aside from the myriad of variants, the talk usually evolves into transistors and who used which variant. There was a curious time in Muff history, when the circuit designed changed drastically. That time was 1978, when the transistors inside were scrapped in favor of operational amplifiers, otherwise known as op amps,