Hello All,

I have finished recapping a 1948 CGE C-600 AM radio and have come up against what sounds like textbook SMD symptoms: loud and persistent crackling unaffected by tuning and no station reception at all. The radio does have the small IF cans with variable induction coils, so it seems a prime candidate for the issue. What I find perplexing is that the crackling remains unaffected when I adjust the volume on the set. This would normally indicate a problem after the volume pot, but perhaps the intermittent shorting of B+ in the silver mica caps would propagate through the circuit? Is it more likely that I have a bad solder joint somewhere? They all seem pretty solid. I have checked all the tubes and I am quite sure that there is no problem there.

This radio has an odd tube set (12SK7, 12BE6, 12SK7, 12SQ7, 35L6, 35Z5 – 0 hits on Radiomuseum) and unfortunately the schematic I have found does not have a parts list. If anyone has such a beast (no luck on RCC), I would very much appreciate the cap values for C5, C6, C7, and C8. I was planning on replacing the IF silver mica caps with 100 pF silver mica caps and crossing my fingers…

Thanks very much for any wisdom you may be able to dispense!

Andrew