Quote:
Originally Posted by 6GH8cowboy
. One end of the bright cont has never had a connection soldered to it.
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Then that's why the control is not working. The low end has to go to ground per the schematic. Once the low end is grounded, voltage at the wiper should swing smoothly from 275V down to near zero when you rotate the control (provided the resistance element has continuity end-to-end).
I would disconnect one end of that neon bulb too, just to keep it out of circuit for now. Its sole function is probably just a safety 'spark gap'.