Personally, in this sort of situation I reckon the shotgun approach is the way
to go - just replace all the crappy caps, and all resistors over 50k - saves a
lot of time and in many cases fixes the problem in a short time. If the fault
is still there there is not a lot more to check

David (a different one)

David wrote:



I looked at some of the pictures. My guess is that you basically need to
measure every resistor and capacitor in this set. You most likely have
several resistors that have gone WAY up in value and several capacitors with
excessive leakage resistance. Do not be surprised if you have to replace
every one of those wax coated capacitors and many of the resistors as well.
A usual suspect for your symptom is the resistor that feeds the plate of the
audio amplifier (6SQ7) which should be in the 100K to 470K ohm range.

David