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Re: [Amps] filament choke

To: Tom W8JI <w8ji@w8ji.com>, Angel Vilaseca <avilaseca@bluewin.ch>,amps@contesting.com
Subject: Re: [Amps] filament choke
From: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Reply-to: g3rzp@g3rzp.wanadoo.co.uk
Date: Mon, 18 Dec 2006 11:40:29 +0100 (CET)
List-post: <mailto:amps@contesting.com>
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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