Amps
[Top] [All Lists]

[AMPS] NCL-2000 comments

To: <amps@contesting.com>
Subject: [AMPS] NCL-2000 comments
From: measures@vc.net (Rich Measures)
Date: Wed, 30 Dec 1998 15:02:46 -0800
Carl Heuther  wrote:
>................
>The NCL screen supply is no better or worse than the competition of the
>era. 
>
Rich Measures  wrote:
The NCL-2000 screen supply is capable of producing high current.   There 
seems to be  nothing to limit screen current.  

>>....... As I recall,  RCA recommends a rf-nfb R in an unbypassed cathode, 
>>like Eimac recommends for the 4cx600, like Svetlana recommends for the 
>>4cx1600.  The NCL-2000 did not.  
>
>
>The NCL strictly followed RCA recommendations right down the line. 

?  The cathode pins are grounded on the NCL-2000's diagram.  

>The cathode resistor is suggested as an option in Class AB1 and at 2000V or
>less ONLY.
>
>I tried ur QST mod many years ago ( 198 something)  and it brought the
>amp up into parasitic land. 

?  A lower vhf-Q, vhf parasitic suppressor -- i.e., one with better vhf 
damping ability --  caused the amplifier to oscillate at vhf?
>...........


Rich...

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


--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm


<Prev in Thread] Current Thread [Next in Thread>