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Old 17th Jun 2019, 9:23 pm   #63
simpsons
Octode
 
Join Date: Feb 2007
Location: Harrow, London, UK.
Posts: 1,483
Default Re: Help to identify old Philips valve radio. BIF 571A.

Unless I've missed something, why are you changing capacitors willy nilly?

The first check must be if there is any DC on the grid of V6 it should not be positive. If it is hook in anything from 0.01uF to whatever @ 300vdc working.

Move then onto HT, then V5a and V6 anodes. The schematic will tell you what should be there. If there little or no hum from the speaker and the HT is OK, the main smoothing is probably OK. No need to stuff anything.

Should these be within spec, the cathode bypass C3 would be my next choice.

The loudness capacitors are unlikely to be short circuit
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