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The first thing to try is just piling on the caps (in parallel) for the
vertical output-deflection plate coupling caps. Find what you can
at the required voltage and get up to .02 or .025 uF.
Film, ceramic, just pile them on.
Next, if that does not work, get out your 15 or 25 kV HV probe, hook to a scope, and
check each side of the caps. Remember to use DC coupling!
That's important!
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