Because only a crt that is holding a PERFECT vacuum (not a leaker) can be rebuilt. The duds that are in the hands of collectors are leakers that will not hold a good vacuum after rebuilding. Rebuilding a leaker is a waste of time. It will only produce a picture for 30 days or less, and when the vacuum degrades, the crt will once again be useless.
A method of fixing the leaks must be found before a successful rebuild will be possible.
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Vacuum tubes are used in Wisconsin to help heat your house.
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