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An NTE526A is the version with the internal focus block and it can be used to replace the seperate tripler and focus block components. In fact, that's what I'd do because those seperate focus blocks gave trouble and they are getting harder to find.
Not saying it can't happen; but, I've never seen a tripler that caused the symptom described. They would either arc, cause focus problems, or short internally. When they short, they can take the flyback and HOT with it. I've seen that problem a lot, especially on the vertical chassis sets and once on a flat chassis set.
When I suspect a tripler, I lift the HV input lead to the tripler and isolate it so it does not arc to anything. If there is HV at the lead and if the CB stays in, the tripler is bad.
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