Re: [Amps] filament choke

[Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>]

The filament chokes I use in my grid driven amplifier for applying NFB are 
wound on ferrite toroids, about 2 inches in diameter and 3/8 inch wide and 
thick. But they have lower inductance, as they only need to be about 10 
microhenries at the most, and are shunted RF wise by 10 ohms. For a grounded 
grid approach, of course somewhat more inductance is needed, especially on 
160....The rod approach has the advantages Tom outlines then.

73
Peter G3RZP
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