A few checks that you can make to eliminate the most common causes of low HV:
Check the horizontal output, damper, and oscillator tubes.
Check the HV rectifier and regulator tubes by substitution.
Verify that you have proper drive to the HO tube grid, proper screen voltage, and proper cathode current.
Check the DC resistance of the flyback HV winding.
Look for leaky caps, deteriorated coils or off-value resistors in the horizontal sweep stages.
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