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It is possible the seleniums on the convergence board are bad usually after caps are changed and resistors checked those are next on my list of suspects.
You want to replace them with shottkey diodes. Silicon diodes like the 1n4007 likely will not switch fast enough at horizontal frequency.
EDIT: have you checked the color circuit tubes? On my zenith roundy the color did not work because the tubes were simply dead out of cathode emission.
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