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[AMPS] tuning capacitor & insulator

To: <amps@contesting.com>
Subject: [AMPS] tuning capacitor & insulator
From: measures@vc.net (Rich Measures)
Date: Fri, 18 Dec 1998 08:56:10 -0800
>
>
>
>On Thu, 17 Dec 1998 16:25:34 -0800 Rich Measures <measures@vc.net>
>writes:
>
>
>SNIPPED
>
>
>>>No criticism of Rich's particular design; the limitation is in the 
>>tubes
>>>themselves.
>>>
>>Ä  Did you perhaps presume that the 7580 has the same power capability 
>>as 
>>a 4CX250B?
>
Carl Heuther, NJ1H, wrote:
>Presumption or fact Rich?  Yes the 250R and 7580 ( not exactly the same
>tube either) have somewhat different specs than the 250B ,  but they
>still have identical cathode emission.

? According to Eimac's Technical Data  (6-16-61):   "The 4CX250R will 
deliver more output power in most linear amplifiers which presently 
employ the 4X250B or 4CX250B ... ... ...".    
Carl:  How can "more output power" be obtained if the B and R versions  
"have identical cathode emission"?

-  The constant current curves  unsurprisingly shows that the R version 
has a higher peak current ability than the B version.  However, 'more 
output power' is realizeable only when sufficient screen-potential is 
used.  
  
-  later,  Carl


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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