[Amps] 3CX1500A7 versus 3CPX1500 TSPA

[Dr. David Kirkby]

Gudguyham at aol.com wrote:
>  
> In a message dated 1/22/2007 12:46:34 P.M. Eastern Standard Time,  
> david.kirkby at onetel.net writes:
> 
> 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.
> 
> 
> 
> Yes this is true and the basis for my offering.  Not only that, I have  
> tested such tube in my Al-1500 which yields me perfect results and then  some.  Lou


But there are severals differences in this case.


1) Clearly the tube is *not* simply a pulsed version of the 8877. A 
number of characteristics are significantly different, like heater 
voltage and size.

2) The 8877 is not the 3CPX1500A7 which you claimed, although I admit 
that the difference between an 8877 and a 3CPX1500A7 is very minor and 
of no significance. But the tube you are offering is neither.

In fact, how do you know what its specs are? Do you have a datasheet? Or 
are these just guess and hearsay?

3) You claimed it was an industrial version of the 8877. Nothing to back 
that up at all. Given the nature of these power tubes, I would say they 
are all industrial units. I doubt Eimac could survive selling tubes for 
just home users.

4) You claimed the higher power and lower drive than the 8877. Again, 
there was nothing to back that up.

I personally feel it is wrong to advertise the tube the way you did. It 
stretches the truth somewhat.

It is that sort of advertising that leads to unhappy customers, and then 
arguments about shipping costs.

It just strikes me as a bit odd that you knew about the extra power and 
gain, but not about the fact it was bigger and needed a different heater 
voltage.
If you do have a data sheet, I'd be delighted to put it on

http://www.g8wrb.org/

Files can be uploaded via

http://www.althorne.org/php/

dave