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Many of those GEs had a problem with the Hor. oscillator not starting because it's supplied from B Boost. The fix was to put a diode between the Boost source to the B+ line. That way, the H.osc starts on B+, then when the Boost comes up, the diode becomes reverse-biased and the osc. then runs on Boost.
I don't remember seeing this particular problem in the Admiral clones, though.
Another frequent problem in both GEs and Admirals was- someone would jam the back on without lining up the H.hold shaft with the hole, thus ripping the coil partway out of the circuit board.
Never seen the 33GY7 actually red-plate though, even under sustained absence of grid drive. Figgered this was due to the low B+ design.
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