[Amps] 3CX1500A7 versus 3CPX1500 TSPA

[Dr. David Kirkby]

John T. M. Lyles wrote:
> With all the hoopala here questioning honesty of selling various 
> 8877-style triodes as interchangable, I didn't see mention of whether 
> the pulsed tube (having a longer anode ceramic) would have the same 
> Cpg, output capacitance. This may make a big difference in a 
> particular amplifier, esp at the higher frequencies. Beside the 
> obvious of it sticking up higher in the socket, the tuning may get 
> offset by the fixed tube capacitance, something to be aware of. Moot 
> point, since it was sold already, but be careful of interchangeable 
> sockets without heeding noninterchangeable tube characteristics.
> 
> 73
> John
> K5PRO

The Eimac data sheets are at:

http://www.g8wrb.org/data/Eimac/3CPX1500A7.pdf
http://www.g8wrb.org/data/Eimac/3CX1500A7.pdf

Other tubes at

http://www.g8wrb.org/triodes.php
http://www.g8wrb.org/tetrodes.php
http://www.g8wrb.org/pentodes.php


I can't be bothered to look at the specs now.

BTW, does anyone have the spec sheet for the tube Lou was offering? I'll 
stick it on the web site if someone does. There seems so much folk law 
on here, with few ever bothing to look at a data sheet.



Reid Brandon at Eimac once sent me an email saying that basically the 
pulsed tubes could be used in place of the non-pulsed ones in amateur 
applications.


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