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If a variac is out of the question then I would go with the Dim Bulb method, at least that way you have some idea of how much current is being pulled by the set.
You can start low with a 50 watt bulb and work your way up, a 200 watt bulb should power a set well enough to at least start up, if it's going to at all.
You have to privide enough voltage for the 5U4 to begin conducting, otherwise it's pertty meaningless.
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