[Amps] 3CX800A vs 3CX800A7?

[Bert van Holst]

Your wrong,

the cpx is a pulse rate version of the 3cx800a7 wich can handle more high
voltage for RF aplications in medical equipment MRI etc.
You can swap the 3cpx800 direct with the 3cx800.
I have an 3CPX1500 in my alpha 77Dx, were original the 3CX1500 is build in.

Bert PA1K

----- Original Message ----- 
From: "ROBERT MARSTON" <rmarston at sbcglobal.net>
To: <k2xx at swva.net>
Cc: <amps at contesting.com>
Sent: Sunday, November 23, 2003 6:26 AM
Subject: Re: [Amps] 3CX800A vs 3CX800A7?


> 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 at 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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