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[AMPS] More and More and More and More - drive derived screen potential

To: <amps@contesting.com>
Subject: [AMPS] More and More and More and More - drive derived screen potential
From: measures@vcnet.com (measures)
Date: Mon, 20 Dec 1999 11:24:23 -0700
>And if the power output was 20% higher than normal of the G2DAF design, that
>is a sign that the amplifier was overdriven.  

With AB1, no grid current is permitted.  With DAF grid current is 
permitted.  When positive grid voltage is permitted, peak anode currents 
increase substantially.  

>Since the plate efficiency is
>no different than the "standard" configuration, greater output indicates
>overdrive.  

?  Not by DAF rules.  By AB1 rules, yes.  

>Simply reducing the drive to get the same power input and output
>would have reduced the distortion.
>
>I can increase amplifier distortion on any amp that it at the normal limits
>by overdriving it.  This is another way to assure failure.
>
>So, the amplifiers you listened to were being overdriven 

?  not according to DAF recommendations. 

>and used tubes that
>you say were poor tubes to use in grounded cathode linear service.  Good
>tests!
>
?  The 4cx250Bs worked well with regulated screen supply and zero grid 
current.  

>Did they also use power supplies that sagged 50%?
>
?  ______________________ .  

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


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