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To me, it seems clear for some time now the supply of TV tube enthusiasts is dying out way faster than the supply of TV tubes. Prices of tubes used mainly in TVs continue to fall, and for good reason. There are thousands and thousands and thousands of TV tubes out there, new in box, that will never be used.
The same cannot be said for audio tubes, of course.
Even for CRTs, except for a few types, there are enough good ones out there to keep sets alive for TV collectors. I don’t mean 15GP22, but the supply of 10BP4 will last forever.
All that being said, solid state replacements for non-display tubes are generally possible to engineer.
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