Quote:
Originally Posted by dieseljeep
A few years back, I was in an old radio TV shop. There was an earlier 30's Philco radio in for repair. I asked the owner if the bakelite block capacitors were replaced. He said no, they never go bad. I replied that, there would a lot of collectors that would disagree with you.
I read that those caps were vacuum impregnated. Having some experience with that process, I would almost have to agree. 
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~80 years time is enough for almost anything to go bad.
I have a 1932 Philco cathedral (the model escapes me), that essentially worked as found. It had no hum, but the audio/reception was weak and VERY distorted. Restuffing the block caps returned it to working like new.