[Amps] 4CX250 IMD

[Richard]

Compared to poor regulation, yes.  Compared to a well-engineered zener 
shunt screen regulator, probably not a significant improvement.  To 
arrive at good linearity with a 4cx250B/R/BC/7203, load for less screen 
current, use maximal anode supply V. and add c. 5-ohms of RF-NFB R in the 
cathode (Rk).  See Fig 10 on my Web site.

>G3SEK is vacationing in the states at the moment, but he gets significant 
>improvement in IMD suppression with the tube by holding the screens within 
>millivolts using active regulation.
>
>W4ZCB
>
>
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-  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, 
www.vcnet.com/measures.  
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