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Re: [Amps] Pi-L Network Question

To: amps@contesting.com
Subject: Re: [Amps] Pi-L Network Question
From: peter chadwick <g8on@fsmail.net>
Reply-to: g8on@fsmail.net
Date: Tue, 11 Mar 2014 17:25:44 +0100
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Jim,

I used your  values to calculate (by a series of parallel - series and series - 
parallel transforms, the back of the NCJ renewal notice and an HP41CV!) a plate 
impedance of 717 ohms at 1.8 MHz.

I take it we're talking grounded grid AB2? In that case, RCA say the plate 
load, Rp is:

Rp = 2 (Plate voltage DC - minimum plate voltage + Peak grid voltage) / Peak 
plate current.

I suspect that Vic may have a point about what the plate load should be: RCA 
don't use K values for AB1 and AB2 calculations.

73

Peter G3RZP 


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