[Amps] Filter

[William Fuqua]

You may get 120 Hz modulation of your signal if you don't use
bifilar windings. The large 60Hz current may modulate the
permeability of the ferrite (or even saturate it) and produce
a modulated impedance across the input thus producing
hum.


At 05:27 PM 8/12/02 -0700, 2 wrote:
>Two separate rods can be used.
>
> >Is it necessary to use a bifilar winding choke (for GG amp)
> >for filament or can two separate ferrite rods be used??
> >
> >Dennis   W7JX
> >
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>
>
>-  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
>www.vcnet.com/measures.
>end
>
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