Nigel Goodwin Super Moderator Most Helpful Member Oct 25, 2009 #21 MikeMl said: 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. Click to expand... Quite right - no need to do it for DC heaters - wxcept it looks pretty cool
MikeMl said: 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. Click to expand... Quite right - no need to do it for DC heaters - wxcept it looks pretty cool
Roff Well-Known Member Oct 25, 2009 #22 Mr RB said: Won't it stop externally induced currents INTO the heater? Click to expand... Potentially, but the heater/cathode thermal time constant is so long that any current induced would not have a measurable effect on cathode emission.
Mr RB said: Won't it stop externally induced currents INTO the heater? Click to expand... Potentially, but the heater/cathode thermal time constant is so long that any current induced would not have a measurable effect on cathode emission.