[AMPS] Re: RE: QY5-3000

[Rich Measures]

>-----Original message-----
>From: Rich Measures <measures@vc.net>
>To: Lars Harlin <harlins@swipnet.se>; amps@contesting.com 
>><amps@contesting.com
>Date: den 30 oktober 1998 00:14
>Subject: Re: [AMPS] RE: QY5-3000
>
>
>>
>>>......Lars wrote:
>>>Myself, I have built all three amps using G2DAF design. A very clever and 
>>>clean design wich
>>>I highly recommend! If you are interested I can mail you some drawings as 
>>>well as plots from IMD measurements.... ...
>>
>>When a G2DAF amplifier amplifier is tested for IMD by applying a two-tone 
>>signal, the screen potential remains constant.  If no grid current flows 
>>during the test, the tube is operating in Class AB1.  Typical test 
>>results is a total IMD that is quite acceptable.  However, during SSB 
>>voice modulation, the screen potential fluctuates widely and the IMD 
>>increases significantly.  //  Eimac recommends a constant screen 
>>potential for best linearity.  
>>-  later
>>..
>>
>>Rich. Measures.  Web site:  www.vcnet.com/measures
>>
>>
>--------------------------------------------------------------------------
>---------------------------------------------------------------
>
>
>
>Good Morning Rich!
>
>Good to see you in good health! I do consider you a very fine technican 
>and even more important -
>a guy with a good sense of humour! 
>
>However, guess you will have to let go of "Eimacs hand" to broaden your 
>sight, and maybe even, learn something new! 
>
Screens undoubtedly follow a 3/2 power rule.  For example:  Increase 
screen V 50% and peak anode current increases 83%.  

>Well, if noone canīt come up with something new, I guess there is no point 
>starting this discussion all over again, as we covered the subject quite 
>deeply about a year ago.

The screen's 3/2 power rule changes for no man.  
>
>Anyway, as I said, since then two more DAF amps has seen the light here and
>there are more to come.....
>
This should cause no problem if they are only used for 2-tone testing.  
-  cheers, Lars.  


Rich...

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


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