Dave Plowman (News) wrote:
At that price I'd want to be certain it was those caps. Can you isolate
the main amps or perhaps short the inputs to be certain it isn't coming
from elsewhere?


Just solder a new 80v cap of almost any flavour over 1000uf across whats
there.


Identical issue in 50 year old valve radio. Fixed it.

I've got several amps here a lot older than that on the original smoothing
caps.


Bad caps abounded 7-10 years ago.

They all dried out..