A while back I decided to upgrade the speaker terminals on my vintage Technics amp. The old ones were the twist lock kind that will grind off strands of copper each time you connect or disconnect the speakers, and I installed new banana plug connectors instead.
As far as I can tell, that replacement went well in itself, but for some reason the amp's protection circuit doesn't go into operation mode when I turn it on anymore. According to the manual, this could be a short circuit between the speaker cables, or DC voltage in the terminals. I've checked both and come up with nothing.
On the advice of a more experienced vintage Technics owner โ I'm a complete newbie myself โ I tested for voltage at a pair of output resistors, and they were way off. This lead me to replace two pairs of transistors (pre drive and current stabilizer), but the problem persists.
I realise I'm way out of my depth here, and although I have a cheap replacement amp, I miss the beautiful sound of my SU-V4X. Any advice is welcome.