ON the 44? A diode in the fil. line? That is a cold set--I would not expect that to be the case. Maybe on a hot set--like a CTC-36, 41 or 53 or so...
IIRC_-the cold RCA sets with I-O--(which I think is all of the flat chassis sets by them)--had a separate filamant tranny, with a resistor in line with it and when powered on, a switch shorted the resistor and applied full voltage to the tube.
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