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100K ?

Keep in mind those resistors are the B+ current path. How much plate current are you going to get with 50K to ground? (100K / 2).

A low ohm pot with a suitable cathode resistor and bypass cap are needed.

P.S. if you can't stand a pot, the you need to hand select two filament resistors for lowest hum. That's going to be tough at those low values.


Edits: 02/22/17
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