[AMPS] NCL-2000 comments

[km1h@juno.com]

On Wed, 30 Dec 1998 15:02:46 -0800 Rich Measures <measures@vc.net>
writes:
>
>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.  


I refer you to the schematic, not ur off the cuff comments.


>
>>>....... 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.  

YEP, exactly as RCA specified for AB2 and 2500V.  You sure have a problem
reading Rich, may I refer you to a opthamologist?

>
>>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?

A low Q what?   Should I put it in the cathode lead also? Maybe tune it
to CH 2 .

Please, keep your voodoo out of my amp(s)  thank you.

Cheerio   Carl  KM1H



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

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