An friend/acquaintance, is closing up/selling his resale shop, and I stopped in to catch up, before he is gone. I saw this early ‘80’s pedal. I asked if it worked and how much. Correction, mid to late eighties. He told me a friend checked it out and it worked. Told me to take it home to try it. It plugs in to an outlet and has a tube in it. I tried this kind of thing in the mid eighties and took them back to the store. This one needs TLC. Very low volume output and crackling pots. Sucks on some amps, and a real gem on others. The key words are “Real Tube Enhancer”. Kind of like my Mesa Toneburst, but servicing the pedal is a must. It needs full disassembly, Deoxit everywhere, silicone caulk removal that has been plastered everywhere. I am taking it back later today to discuss my findings and pricing. I don’t need it, but it is really cool with Vibro Champ.