An ungapped ferrite toroid will not support DC current without
saturating. Powdered Iron has a distributed gap and will support DC
current.
Tomm
John Popelish wrote:
>Sorry. I thought a plate choke was not operated at resonance, just as
>an inductive impedance between the plate signal and the DC supply. I
>agree that ferrite cores saturates with fewer ampere turns than
>powdered iron ones do, but I think the cores I mentioned will
>withstand about 10 ampere turns or so without saturating. And I think
>their high frequency losses go down when DC biased.
>
>Bill Turner wrote:
>
> > Everything I've ever read on the subject says never use ferrite
>cores in a resonant circuit. Powdered iron is the preferred material.
>Ferrite saturates, powdered iron doesn't.
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