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Well, all the discrete components that are connected to V-6, in particular R-222
R-231, R-229, R-232, C232. The capacitor C-232 is only marked 400 V,
without capacitance, maybe you can locate it on the PCB and identify
it. You might bridge it temporarily with a similar one, without removing
the original. Be careful with those old PC boards, they were fragile even when
new!
Maybe you could try new tubes for V-5 and V-6, although the presence
of sound suggests that they are working.
I'm getting puzzled. Any other ideas, fellow AKers?
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