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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