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OK, so I did some poking around tonight and it's definitely not the power supply like I thought. I see no ripple when the deflection circuits are disabled, but the metal ballast is still getting pretty warm. It seems something from somewhere else in the set is causing the issue, but I don't know where to start.
Does this set have a boost cap? If so, I suspect it might be leaky. There's other caps in the HV garage that still have not been replaced, so I'll start there. Any other suggestions?
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Evolution...
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