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I have never had trouble with flybacks on the CTC-53 type chassis, (unlike on the other types such as the CTC-31 etc. that use a similar flyback connector).
If there was a bad connection at the flyback you should hear sizzling/arcing.
I was having trouble with improper screen voltage at the horizontal output tube causing a lack of HV but cannot remember exactly what I did to fix it.
It was a resistor related problem like what RCAMan is talking about.
Monitoring screen/suppresor/grid voltages at the horiz output tube should help narrow down the trouble source.
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