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One note about the 3A3 tubes used in the RCA sets from CTC16 to CTC39: Some replacement tubes were shorter and did not quite insert fully into the well of the flyback. This caused arcing due to the resulting gap. Sometimes it showed up as loss of horizontal sync due to the RFI generated. But worse, it caused many a flyback tracking meltdown in an RCA set. GE, Philco and others escaped this fate becuase only RCA used the upside-down tube flyback enclosure. The cure was to modify the enclosure cover's screw slots to allow the cover to be lowered sufficiently.
This was a tidbit from a veteran TV repairman I worked for in the 70's.
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