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I found out why the power switch is always on: its jumpered like that.
Removing the jumper, the resistance is a constant 1.4 megohms.
Thus, I need a new switch, which is part of a triple control: volume control,
brightness control, and switch.
These no longer exist ... but I strongly suspect that old RCA volume control+
switch units exist that have a compatible switch. What to do?
(Other than the current dedicated Variac, which admittedly is comforting for
a nice controlled start).
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