[Amps] 3CPX800A7 Not Available (HAROLD B MANDEL)

[R.Measures]

On Nov 29, 2005, at 12:11 PM, HAROLD B MANDEL wrote:

> Dear Tom,
>
> The 3CPX800A7 has more ceramic material that separates the interior
> elements, allowing it to run at an elevated plate voltage.
>
> The 3CX800A7 is rated at 2200 volts on the plate while the 3CPX can
> handle 3400 volts.

However, this does not mean that the 3CPX800A7's safe anode potential 
for RF amplifier service is 3400V because the limiting factor in 
continuous duty applications is electrons bouncing back and heating the 
oxide coating on the cathode, not the v-capability of the anode-grid 
insulator.
>
> The broadcasters really like the "CPX when they run P5 service. The
> medical community uses them in MRI applications.
>
> Commander Amplifiers use them exclusively.

There's one born every minute.
>
> The latest word is that they will eventually be available again,
> with a price tag exceeding 800 dollars.
>
> Hal
> On Tue, 29 Nov 2005 13:11:57 -0600 "Tom Hix" <w4th at charter.net> writes:
>> Hello all;
>> Can someone tell me what makes a 3CPX800A7 so much better than a
>> plain  3cx800a7 tube?
>>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org