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You might try displaying that video line on your scope like in the second picture, triggering on that channel. On a second scope channel probe around to see if you can find a pulse that occurs when the white line does (the jump up in the video trace). That might lead you to where the two signals are combining. Maybe a leaky tube socket.
EDIT: I wonder if it has to do with the DC Restoration circuit.
Last edited by Notimetolooz; 11-12-2019 at 11:21 AM.
Reason: Another idea.
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