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It's probably preachin' to the choir again, but can't be sed often enough. Always re-flow the two ground stakes on the far right-hand end of the chroma board, to keep the heaters lit on the two 6GU7 tubes (possibly 6FQ7s).
When those heaters go out, the CRT grids swing 'waay positive, driving the beam current into an avalanche condition, severely stressing the 3A3, flyback, and H out tube.
This applies to the CTC-12, 15, 16, 17, and 25 chassies.
(in the CTC-19 and all its derivitives, the DC coupling to the CRT grids was eliminated).
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