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It might not be inside the tube at all, nearly any arc can cause the sync circuits to hop like that. My CTC-4 did the same thing, I traced it back to the coating on the plastic CRT insulator being degraded. That caused stray static charges to randomly build up, which would then discharge when it approached a certain potential (much like lightning searching for the ground). Scrubbing off the dag and reapplying is the answer of course, but for now some foil attached with spray adhesive does the trick. Find your bad dag, you'll likely cure the problem. Oh, and make sure that ALL ground straps are in place, even the ones going to the trim around the front of the set.
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Evolution...
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