Came from a retro stereo system which stood unused for many years, but I'm pretty sure it was working before it fell into oblivion. Slightly weird power arrangements... It needs a 9v supply, originally via a 3.5mm stereo jack connection. No doubt you can make alternative arrangements if you know anything about electronics, but I don't.
If you're interested please say when you can collect from Upper Wolvercote, and provide a phone number. Thanks.