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Note that in the schematic above this is a PNP positive ground device. The original transistors were silicon devices, I think that I have sourced some from somewhere and they are nothing particularly special. Below is my stripboard layout for the Wah which I have converted to NPN - negative ground. Usual suspects work in this: BC108, 2N3904 etc. The original layout is smaller, but the parts are all over the place, I've built working devices from my layout. Substitute the old values with nearest value you can find and it should be fine. Black squares equal track cuts.