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At this point I would do this: Locate the .05 cap which goes thru a 180K resistor to pin 5 (plate) of the 6AU6 sync separator. Disconnect that cap. This completely decouples the sweep oscillators from the video chain, leaving them free running.
Then you have to manually jockey the hor and vert holds to hang onto the pic. See if the hula'ing is still present. If it is, then the ripple is not originating in the video chain but in the sweep area.
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