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40-180 electrical troubleshooting
#1

I’m currently working on my Philco 40-180 radio. I’m having an issue. No sound. Low hum from speaker. I keep smoking (60) resistor. My voltage across the (61) capacitor is 200VDC and the voltage across (58) capacitor is around 40VDC. Not sure what’s going on. I appreciate all the help this is my first radio and I only have a basic knowledge of electronics. Thank you


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#2

Greetings;
I would suggest checking for voltage on the plates of the audio output tubes, the output transformers in these sets are notorious for failing primary windings. It is also possible that you may have a shorted tone correction capacitor connected across that same audio output transformer, or possibly a very leaky bypass capacitor elsewhere loading down the plate voltage.
Regards
Arran




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