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They made those ceramics as far back as the 1950s. Most caps before 1960 were paper. I believe 58-64 were the transition years from paper to film. I have seen those ceramic tubulars bad in mid to late 60s TVs recently. I have also found some defective orange drops in 60s sets. And some 30s-50s sets are having substantial mica cap failure. Anything over 60 years old that isn't in a vacuum is potentially subject to degradation so suspecting everything is valid. I tend to consider ceramic tubulars as being much much worse than the other caps mentioned.
It is possible those tubular ceramics are good in 70s sets but they were the among the safety caps recalled in early 70s SS Zenith sets, and (8 years ago when I was buying parts local) I had a NOS 3KV tubular ceramic I was told was film that had a higher voltage rating than the 2K the circuit specified dead short after a few months... Because of all that I just change them all so I don't have to worry.
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