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[AMPS] Plate RFC choke design

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Subject: [AMPS] Plate RFC choke design
From: (Rich Measures)
Date: Thu, 26 Mar 98 20:02:56 -0800
>Does anybody have a proven design for a plate choke?  
>I'm building a 160-10 (no WARC) amp using a pair of 3CX800A7 tubes, (1.5A max
>Ip).  I've seen lots of plate RFC designs that use anywhere from 80 uH 
>(Ten Tec
>Titan), and on up.
There is a section in *Amplifiers* about hv-rf chokes:
Basically, two chokes mounted at right-angles work better than one.  

>All the homebrew designers treat winding a choke as a black art.  I've got
>various lengths of 1" and 1.25" Delrin rod to work with, and would like to 
>#20 wire.  It can't be that hard, can it?

Nope, if you do your homework.  .  #20 silicone-varnish wire will easily 
handle 5a in hv-rfc  service.  #24 would be plenty for 1.5a.  .  Delrin 
has a fairly high Dissipation-factor.  G10 epoxy/fiberglass tubing is 
much less likely to cause a choke fire, however, G10 tubing is not cheap. 
 .  You need a dipmeter to assist in safely parking the resonances in 
unused areas.   A hand drill (held in a bench vise) comes in handy.    
later, Kevin


R. L. Measures, 805-386-3734, AG6K   

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