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I think it means something is drawing increased current periodically. Increased current would load the power supply more, producing ripple. If you remove the horizontal output tube plate cap (and suspend it so it doesn't short circuit to anything), I'd bet you a glass of beer the ripple goes away.
If this is the case, try changing the horizontal oscillator tube again and substituting a different horizontal output tube if you have one. Also make sure the components in the horizontal section are all good, capacitors and resistors.
Last edited by maxhifi; 07-13-2020 at 09:58 PM.
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