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There are still A LOT of CRT applications in military, air traffic control, and other fields. In fact, another AK'er said that the updated version of the 21FJP22 is still in the current Navy parts catalog. I remember being told within the past 15 years that 10BP4s are still in use in some applications too.
HOWEVER, as Tom and Bryan said, somebody with an interest in TV history better get on the stick and buy some equipment, get as many guns as can be found, and learn the procedure.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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