@ Dswankey: nope, 2 different ones. But to replace the hifi set from that thread... In the shop back than it played for one or two weeks without any problem. I reconnected everything at home, it worked a few times and the amp decided not to work again. So it's been unused since. Last week I took it another place to repair on a "repair café", which means, they repair while you watch... Same story, all worked. Got home, installed everything, worked like a charm for almost week, since then, stopped again. I took it apart, cleaned the contacts with contact cleaner, worked again... for a few hours. No idea what is wrong with it, and it's one of these cases you can spend hours and hours trying to find what's wrong and still not find it. I want to keep it though, preferably working.
@ PPstereo, thanks, I'll look into it!