The JHS Overdrive Preamp is a simple two-knob circuit inspired by the DOD 250 and featuring both gray and yellow versions, accessible through a switch. The builder's notes say its primary voice is based on a prototype of the DOD 250 from the '70s found by JHS owner Josh Scott, while the second mode "alters the pedal's clipping arrangement, unlocking a whole alternate set of tones."... Click on the title for more