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Really? The Motorola TS-18 chassis has a few and I think it's of the same year.
I tried to find when they were in common use. The only thing I could find with Google was that discoid ceramic capacitors became available in the 30's. At least according to a wikipedia article.
I replaced a couple with silver mica since I didn't have the right value ceramic caps on hand. I assume that should be o.k. They're a bit physically large though. I thought about using film caps. They're actually smaller than the silver mica that I had. Maybe I should have.
I'm going to have to bathe the coffee can HV section with electronic cleaner. (I referred to it as a doghouse before, but I guess that wasn't quite the correct term.) The HV capacitor leaked oil and it appears that corona changed it into something really nasty. I tested the HV transformer to make sure the coating wouldn't dissolve. It seems safe.
John
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