Cambridge Audio A100 power amp, fully dual mono and very well built (weighs c20kg). It worked fine for a while, then one morning I couldn't get any sound from it. It may be as simple as a blown fuse, but I've not had the time to investigate. There's no sign of anything inside having suffered physical or heat damage. There's two really chunky (500VA?) trannies in there, big caps and heatsinks etc. I've got internal photos if you want them. Asking £20 plus postage, I might take a lower offer if you ask nicely! Simon