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Don't spend yourself in a hole with all these caps - capacitor mfg. techniques today produce a product far more stable and long-lived than the old wax-dipped or molded-case paper caps. These modern caps are often far better than what was available (or used) in the 30's or 40's. If you can find micas in the reddish dip at tube voltages, go for it. But you are repairing old radios, not missile-guidance or heart-pacemaker devices. Just buy (as I stated previously) temp-stable ceramics for RF circuits if you can't find the value you need in mica. Unless you listen to single-sideband hams on the 20-meter band, you won't be bothered with drift issues.
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