[AMPS] Amp using 833A

[measures]

>
>From:           	Peter Chadwick <Peter_Chadwick@mitel.com>
>Subject:        	RE: [AMPS] Amp using 833A
>> 
>> Rich says:
>> 
>> >Medium Mu triodes draw little anode current unless the grid is driven way
>> > positive- and that means distortion.   
>> 
>> 
>> This is not necessarily so. Class AB2 or Class B2 operation with grid
>> current in grounded cathode requies a well regulated bias supply, and a
>> well regulated drive, but it does NOT automatically mean high distortion.
>> Pappenfus in fact says that AB2 can result in lower IMD than AB1.
>
>I think this goes back to arguments in the past Peter, where Rich 
>felt that:
>
>Any positive grid to cathode potential = unacceptable distortion
>
Not an example of good reading skills.  // I said that for grid-driven 
config., grid current leads to downtown Distortionville.  For cathode 
driven, grid current is normal.  The difference is RF-NFB.  

>That equation isn't true in many if not most cases. 

That equation is Mr. Rauch's invention.  Tom scores slam dunks against 
revised quotes.    

>The worse thing 
>about the 833 will be stability and the fact that drive power in GG 
>would be too high.  
>If it provides acceptable distortion in AM BC 
>service as a class B or ABx modulator, it is likely to provide 
>acceptable distortion performance as a linear amplifier if other 
>issues can be resolved.
>
The problem with medium Mu tubes in grid-driven linear service is that 
they can not draw enough peak anode current 
>
later, Tom.  

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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