Search for: Your Source for DIY Pedal PCBs and NostalgiTone! › GuitarPCB Forum › Topic Tag: big muff Viewing topic 1 (of 1 total) Topic Voices Posts Last Post BIG MUFF op amp kit v2.5 – no audio Started by: Anonymous in: GuitarPCB Build Support 2 2 3 years, 1 month ago mybud Viewing topic 1 (of 1 total)