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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