Search for: Your Source for DIY Pedal PCBs and NostalgiTone! › GuitarPCB Forum › Topic Tag: PUFF External Bias Viewing topic 1 (of 1 total) Topic Voices Posts Last Post Pumped Up Fuzz Face – external Bias Started by: Anonymous in: GuitarPCB Build Support 4 6 4 years, 5 months ago Chuck Viewing topic 1 (of 1 total)