[Amps] Plate impedance

Mon Apr 10 11:00:00 EDT 2006

All.

There is an excellent article published in Ham Radio Magazine dated 
September 1972 on Page 6 through page 22 by Irvin M. Hoff, W6FFC titled 
High-frequency power amplifier pi network design that should answer your 
questions..  This is an EXCELLENT article on Pi and Pi-L design and would be 
worth everyone reading it.

I'm not sure if the author is still around or not as I have attempted to 
track him down and been unable too under either this call or his earlier 
call K8DKC.  This is the same author who did a lot of work on RTTY back in 
the 60's and 70's.

73,
J. Leon Pringle, Jr   W5NA
PRINGLE50 at COMCAST.NET
W5NA at MDXA.ORG

----- Original Message ----- 
From: "Will Matney" <craxd1 at verizon.net>
To: <amps at contesting.com>
Sent: Monday, April 10, 2006 12:17 AM
Subject: [Amps] Plate impedance

> All,
>
> I started reading through the RCA Radiotron Handbook this evening looking 
> for where the factor of 1.8 is listed for calculating the plate impedance 
> of a class AB amplifier, and I can not find it. The edition I have was the 
> older one back in the 40's with the black cover. The red one was from the 
> 50's and had more in it if I recall, but I don't have it. I was wanting to 
> find where it gives this factor, and the ones for Class A, AB1, AB2, B, 
> and C. Bill Orrs handbook gives the factor of 1.8 on his Pi tank values 
> table, but doesn't mention anywhere in the text where it came from. I also 
> looked in a RCA receiving tube book and could not find it there either, or 
> I am overlooking it somewhere. I could have sworn it was in the Radiotron 
> Handbook. The Handbook does say that the plate impedance is twice the peak 
> voltage swing times the peak anode current. What I'm wanting to know is 
> where are these factors located in print, as I'd like to read the whole 
> texts concerning this? Any help
>  would be deeply appreciated. Thanks to all in advance.
>
> Best,
>
> Will
>
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