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What manufactures did with PC boards seemed to be all over the map in the 1960s. Zenith did not use them at all. RCA used them for the lower power tubes, such as the IF, Video AMP etc. while mounting higher power tubes on the chassis. GE (and sometimes Philco) placed every tube on a PC board-Bad idea.
I did work on a RCA roundie color TV with a carbon trace problem on the PC board once, but their idea of using the PC board for the low power tubes seemed to work pretty well. In fact I have two 1962 portable B&W RCA tvs built this way that I watch regularly.
However, I have some small GE B&W sets and only could barely restore two out of five of these as the Horizontal output tubes had charcoaled all of the PC boards. I am sure this caused a lot of headaches even when these sets were much newer.
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