Nate Dort wrote: Thu Feb 24, 2022 12:53 pm Are you sure the other supplies are the same polarity as the BOSS, i.e. center pin negative?

Yeah, they're all center negative. I recall the seller saying it couldn't use a 1 Spot. I had my wife look at it, and she says it has a 2SB75 transistor. Maybe that's why it sounds good.

That's a PNP transistor, which in this circuit would usually be built in a positive ground fashion. The builder likely said it cant take a One-Spot meaning that it cant be daisy-chained with a One-Spot and other pedals operating in the more standard negative ground fashion. It will certainly work with a One-Spot by itself if it worked with a Boss supply.