Re: [Amps] RE: 4CX250B Screen Supplies

[Bill Fuqua <wlfuqu00@uky.edu>]

I disagree. In the two tone situation the screen current is fluctuating at 
the difference frequency of the two frequencies. And if you should chose 
the frequency difference to be the lowest audio frequency modulation used 
(300 Hz usually) you will take in account the bypass capacitance reactance. 
The IMD could be improved simply by having a very large AF bypass capacitor 
having a  very low reactance at a few hundred Hz.
73
Bill wa4lav


At 03:36 AM 7/23/2004 -0700, R.Measures wrote:
> Also, with a 2-tone test, it would seem not to matter whether the screen-V 
> is regulated or unregulated since screen-I is constant and therefore 
> screen-V would not vary unless the electric-mains V fluctuated.
> end

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