Dirty connections in Technics su-v7

[Ian Finch]

.... looking at schematics, it is not dual mono amp. One transformer, one set of filter caps, both channels share the same power supply for preamp as well.

Thanks indeed for your assistance. I think we can be sure that's what you need as replacements and it's a pretty standard value. You could use any capacitance from 12,000-20,000 uF and from 50 to even 100V rating if you can't get the exact value. It MUST fit hole centres and termination type, within max. diameter and casing height too. if it's taller.

I certainly don't recall any Japanese domestic amplifiers from the 1980s with dual mono power supplies. (one to each stereo channel) However, perhaps Tornislv, you can see whether the supply for the class A amplifiers is from the same rails that the main amplifier uses. Also, is there a separate winding to supply the preamps or just dropping resistors and zener/power transistor regulation?

Note: The class A amp. is not always obvious. It is variously just in a special IC or it's a small discrete amp. even using full rail voltage. Technics would not simply leave their design for other people to copy - not the bridge circuit, in particular. 🙁

 

[MacroFilkins]

Thanks again Ian. I made a typo in my last post. I meant to write power transformer, not transistor.
I've been too busy lately to tear into this amplifier, but all the advice here will help as soon as I have the time to work on it. I'll let y'all know how it goes and I'm sure I'll have more questions in the near future.
Thanks to all of you!