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Bob: You are ignoring door number 3: The makers designed the set so the flyback would run hot, and not have sufficient power headroom or cooling provisions to do otherwise....Many RCA designs did this or were on the edge to the point that non-optimal conditions would push them over (though IMHO the CTC-4 was one of their better H deflection/HV system designs).
Chris: May I suggest a procedure to select operating voltage? When I was working on my CTC-4 I set the line voltage such that the highest B+ rail directly derived from the power transformer matched the spec in the schematic.
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