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When we get an old radio/jukebox/amp etc in for repair we don't even try it till all paper caps and electrolytics are replaced. Having repaired and used tube type equipment for 20 years I can say old caps are just bad news.
Using a silicon diode would work for slowly applying voltage to a cap whereas a 5U4 would not: however I would not trust such a cap to work reliably for an extended period. The old electrolyte just dries out. Paper caps are just bad all the way around! They can not be rejuvenated by any means.
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