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Flyback temperature shouldn't be that hot. Warm to the touch is what you want. Why are you running the HV that low? Most roundys usually specify 25KV. The lower you set the HV the more HV current, loading and heating the HV regulator causes in the flyback.
An additional thing you can do once you have all horizontal adjustments optimizedand bad components identified and replaced is swap the HV rectifier and or focus rectifier tubes for solid state substitutes...The SS parts don't have heaters and reduce the flyback loading a few watts which can be helpful in cases like this.
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