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RE: Won't work like that with the variac.

I think Triode Kingdom hits the nail. Reducing the input voltage will most likely reduce the DC pluse frequency instead of the output voltage for these type of chopper transformers.

I don't think it will sound the best also at the reduced DC pulse. Why not use a regular 12V SMPS power supplies and reduce the output down to near 10V? I have experienced with them and found they work quite well for the 10V filaments in the Big Transmitter tubes.
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