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What I remember about that story is, It seems like the batch of 15GP22's discarded was used in a flying spot film scanner or other such specialized piece of equipment that was still in use for a while even after the 15GP22 tv receivers quit being made. When the device using the 15GP22's stopped being used, the tubes were discarded.
Also I read a story about someone who was using a CT-100 up through the late 70's with an RCA service contract, and RCA was continuing to replace the 15GP22's in the set.
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