These are VHF chokes, typically 20 turns of #20 wire on a 1/2 inch form. The
purpose is to prevent any RF not blocked by the plate choke from exiting the
RF deck. A small value (10 ohms or so) wire-wound resistor does the same
thing, and also serves as a glitch resistor. There is typically a 1000 pf
bypass capacitor to ground on each side of the choke.
(((73)))
Phil Clements, K5PC
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of John Irwin
Sent: Saturday, April 30, 2005 2:34 PM
To: amps@contesting.com
Subject: [Amps] plate chokes little buddy
dudes>>>
On most tube, hf ,rf, shunt feed, amplifier schematics there is a small RF
choke in series with and just below the main plate choke. A much smaller
value in mh than the plate choke, sometimes it is a resistor rather than a
choke. What is the purpose of this second choke and how is it's value
determined?
Thanks
john kb9tc
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