[Amps] Plate impedance

[Gary Smith]

Hi Leon and the group.
Did some cursory checking, his 6 call appears to have been reissued,  that 
individual exchanged for a  call in the 4 area.  My guess is Mr Hoff is a 
sk.
73,
Gary...wa6fgi

PS: are you related to a Len Pringle who I knew many years ago?





----- Original Message ----- 
From: "J. Leon Pringle, Jr and Audrey S. Pringle" <pringle50 at comcast.net>
To: <amps at contesting.com>
Sent: Monday, April 10, 2006 8:00 AM
Subject: Re: [Amps] Plate impedance


> 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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>
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