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red green and blue bars running up and down?
That is one I have never seen. Almost sounds like some low level ripple getting into the chroma board. Maybe a heater to cathode leak in one of the 6GU7s or other tubes in that area? Weak filter? Video tube with some weird condition like mentioned.
I would start pulling the tubes behind the 6GU7s out one at a time with the color off and see if it you can get it to go away.
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