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SV: [AMPS] More and More and More and More - drive derived screen potent

To: <amps@contesting.com>
Subject: SV: [AMPS] More and More and More and More - drive derived screen potential
From: harlins@swipnet.se (Lars Harlin)
Date: Mon, 20 Dec 1999 22:37:27 +0100
AG6K:
> With AB1, no grid current is permitted.  With DAF grid current is 
> permitted.  When positive grid voltage is permitted, peak anode currents 
> increase substantially.  

SM3BDZ:
Its quite true that the DAF design permitts grid current. Thats why you should 
compare the design 
rather to GG than AB1. When a GG amp, or a AB1 amp, is driven to excessive grid 
current,
saturation and flat topping occurs. 

My assumption is that here we have a substantial different compared to the DAF 
design. 
When grid current increase due to high drive in a DAF amp, the screen voltage 
also increases 
and thus sets the roof higher.... That should improve distortion 
characteristics, and make the flat topping "softer" !?

This is only a theory,  but to me it makes sense. Please tell me if I´m wrong!

K7FM: 
> >Since the plate efficiency is
> >no different than the "standard" configuration, greater output indicates
> >overdrive.  
> 
> ?  Not by DAF rules.  By AB1 rules, yes.  

SM3BDZ:
???

K7FM:
> >So, the amplifiers you listened to were being overdriven 

AG6K:
> ?  not according to DAF recommendations. 

SM3BDZ:
And exactly WHAT is the DAF recommendations??

73 de Lars/SM3BDZ (working on my DAF website...;-)


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