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We always used a variac on solid state sets after a power supply or horizontal problem.
Say you replaced a shorted horizontal output transistor, the safe bet was to bring it up slowly keeping an eye and ear and most of the time if there were other issues that caused the transistor to fail they would show up before the new one shorted again.
Tubes arnt nearly as fragile, I never use a variac on tube equipment. You just got to keep an eye out for tubes red plating or capacitors getting hot.
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