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It seems that when the vacuum has failed, and the tube sits neck-up for many years, the phosphor gets dark angular blotches. Now even the one in a CT-100 that I have is doing that, and I was told that the CRT in that one was confirmed non-vacuum as of 1980. That set spent 15+ years in a garage, but has spent the past 15 years since then in an indoor climate. So maybe the phosphor starts taking on humidity or something after a period of time, more so when the tube is on it's face?
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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