Tom,
Thanks for pointing that out. I wasn't thinking about the canceling
effects of bifilar wound and the need to do so especially under high
currents.
Larry N5BIP
Tom said:
>We *never* want to do this with high current filaments. The
reason being nothing cancels magnetizing flux caused by the
many ampere turns of the single winding and the core often
saturates. The result is at best a loss of RF choke
impedance at the filament, at worse it will introduce hum as
the filament current modulates the reactance causing large
reactance swings at a 120Hz rate (two impedance nulls and
two peaks per AC cycle).<
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