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In my years of working on tube type color sets, I have seen many 6JE6s, and other horizontal output tubes, crack along the bottom for no cause at all, other than age. Although I would definitely check the damper, HV rectiifier tube, and horizontal osc tubes for sure as well, as mentioned in the above posts. If the flyback is good, sometimes it's best to change all of those just to be on the safe side, since 6JE6s are are not cheap.
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