[AMPS] drive derived screen potential

[nospam4me@juno.com]

hello,

I want  to thank Ian and Colin for your quick replies about eh DAF
circuit.  Reminds me of a circuit used by Norm (w6edd) in his two 4cx250b
amplifier. He controlled the  screen voltage with drive, although I
believe he did use a negative bias on the control grid. Norm labeled the
amplifier as using "class C linear operation." Opinions of the amplifiers
performance were mixed "up and down the band."  

Next question...   Less the requirement of a bias and "large" screen
supply, why would one want to use this type of circuit?   Are there
stated advantages by users or builders? 

thanks for your opinions
skipp

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