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If you can get the intermittent to hard fail or better yet to be predictable troubleshooting becomes easier. Run it with the back off. Look for tube heaters that are glowing dimmer when color goes out (I've seen tube heaters be intermittent in the socket and other wired things). If that don't work try to monitor voltages and waveforms/amplitudes in the color stages and see what changes and where it originates.
It is easiest to do signal tracing when you have a working set to compare to....This situation allows you to do that without a needing a second set.
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