Preamp tube DC heater circuit

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Now you got me going. Why bother twisting filament wires if the OP is powering them on DC? Twisting the filament wires is supposed to be a hum-bucking technique, but it can only apply if the filaments are heated with AC.

Quite right - no need to do it for DC heaters - wxcept it looks pretty cool
 
Won't it stop externally induced currents INTO the heater?
Potentially, but the heater/cathode thermal time constant is so long that any current induced would not have a measurable effect on cathode emission.
 
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