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Re: [Amps] 3CX800A vs 3CX800A7?

To: k2xx@swva.net
Subject: Re: [Amps] 3CX800A vs 3CX800A7?
From: ROBERT MARSTON <rmarston@sbcglobal.net>
Date: Sat, 22 Nov 2003 21:26:07 -0800 (PST)
List-post: <mailto:amps@contesting.com>
Hi Joe
 
The answer to your first question is yes and no.  The 3CX800A7 is an evolution 
of the 3CX400A7/8874.
 
The answer to your second question is no. There is no such animal as the 3CX800.
 
The number of  pins in the tube's base has nothing to do with its designation.
 
To fill in the blanks between your questions it is necessary to understand the 
numbering scheme Eimac setup for its triodes. Eimacs manufactures triodes for 
three broad categories of applications. The first are Low Mu tubes used as 
Audio Amplifiers or Modulators. The second are Medium Mu tubes used as 
Industrial Heaters. The third is Hi Mu tubes used as RF Amplifiers. When setup 
their numbering scheme they added to all of their triodes that carries 1 of 3 
numbers. 1 indicates a Low Mu tube, 3 indicates a Medium Mu Tube, and 7 
indicates a High Mu tube. All tubes used for RF Amplification of SSB will end 
in 7 but there are a couple of triodes where the B7 variant is used for SSB 
over the A7.
 
If you want to get a better feel checkout Eimac' s Online Catalog. 
 
http://www.cpii.com/eimac/index.html
 
Have fun
 
Bob K1TA

Joe Giacobello <k2xx@swva.net> wrote:

I'm interested in knowing if there was a predecessor to the 3CX800A7. 
Was it called a 3CX800A? Was it physically identical to the A7? Did it 
have 11 pins like the A7 or 7 pins?

I'd appreciate any input that the list can provide on these questions.
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