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Back in the day...
I had a Zenith TV doing something similar messed with it for two days...
Turned out to be the Horizontal Output Tube...
I changed everything (resistors / capacitors) in the Oscillator section No Go...
Changed Every tube in the HV and Horizontal section the set quit acting up then I put the original tubes back one at a time until the problem reappeared.
Have had the phase detector dual diode or tube to do similar...
rrrhre2s
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