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The barberpoling color bars picture indicates your 3.58MHz color osc is off frequency. Dirty pots (except for possibly hue) should not cause that. Sometimes if Horizontal holds is set close to the edge it can break color sync if said sync is marginal.
What's probably necessary to cure the barber pole is adjustment of the color osc coil....a bad tube or marginal osc crystal can cause it too. I'd check and maybe sub the osc tube. If that don't fix it adjust the coil, and if that doesn't have range sub the crystal and if it still won't adjust start checking passives.
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