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Perhaps a tweeking of coils can help a set thats not perfect, but to go from working fine to zero color ,with nothing done in between, does not sound like spontanious slug movement.
I would stick with the basics until better knowledge has been aquired on what do to.
Start by wiggling tubes, then move on B+ checks, then plate and screen checks of the burst and chroma amp tubes.
My guess is a loose tube/bad tube/open power resistor (perhap taken out by a shorted tube).
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