My grandfather loved this pedal for many many years, he bought it new in Dayton of 78 I think. He used it in all of the clubs, he always said you can get a Lonnie Mack sound and a "creamy" Waylon sound. So now on to how it broke, he was replacing the battery and put it in backward I guess and it shorted out something, I really want to get this fixed for him, he's 77 and still gigging. It runs on a regular 9 volt, but I would like to use it with a wall adaptor if I could. Does anyone have a schematic or diagram for it or does anyone have one? Is it worth rebuilding? It's very very rare.. .