[Amps] 4CX10 000J

[R L Measures]

On Jul 2, 2006, at 7:44 AM, Joe Subich, W4TV wrote:

>
> What are the differences between the 4CX1000J and 4CX10000D -
> particularly to explain the 10 KW vs. 15 KW output difference

Joe -- For linear operation, the D has an emission ability of c. 13A- 
pk, and the J's has c. 18A-pk.  The J is almost an 8281 /  
4CX15,000A.  The D's filament requires 7.5V @ 75A and the J's  
requires 7.5V at 104A.  There is no such thing as a free lunch.  My  
guess is that due to it's greater peak emission, a J can do 18 out  
PEP in SSB service.

> in the "normal operation" figures on the Eimac short form
> catalog (www.cpii.com/eimac)?  Of course, with a listed gain
> of 4.5, it would seem to take 2500 W or so to drive either of
> them to their full capability ...

4.5x is the screen amplification factor.   In MF/HF operation, using  
a 1:9 trifilar input xfmr and a grid termination R of 450-ohms,  
either the D or the J can amplify 100x .

end
>
> 73,
>
>    ... Joe, W4TV
>
>
>> -----Original Message-----
>> From: amps-bounces at contesting.com
>> [mailto:amps-bounces at contesting.com] On Behalf Of pa3duv
>> Sent: Sunday, July 02, 2006 5:29 AM
>> To: amps at contesting.com
>> Subject: [Amps] 4CX10 000J
>>
>>
>> Fo those working on a QRO project; Allen Bond from Max Gain
>> Systems has some NOS  4CX10000J tetrodes for sale.
>> Cheers, Dick
>> PA3DUV
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>
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R L MEASURES, AG6K. 805-386-3734
r at somis.org