What chassis does it have? I just learned that the CTC 15s, 16s and their clones had a lot of intermittent connections on the chroma board. I have a set with the red doing what yours is doing and mine's a 15 clone.
You could also hook up a CRT tester and leave it on red for a while, gently tapping the neck to see if there are any fluctuations in the emission or if the filament flickers.
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Kyocera R-661, Yamaha RX-V2200
National Panasonic SA-5800
Sansui 1000a, 1000, SAX-200, 5050, 9090DB, 881, SR-636, SC-3000, AT-20
Pioneer SX-939, ER-420, SM-B201
Motorola SK77W-2Z tube console
McIntosh MC2205, C26
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