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I guess it's a long shot, but do you have any way to check the DC voltages on the 6cg7 (v-706) without taking the chassis out? Maybe a tube extender? It would be a clue even if the voltages are right. I was looking at the schematic, and I think if either L705 or c731 were open, that would cut red without screwing any of the DC voltages up. If c731 was leaky, or r730 was open, it would show up as incorrect grid voltage on pin 2.
If you do find your scope probe, the waveforms usually given with RCA sets were taken with the set displaying a "gated rainbow" color bar display.
John
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