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SemiSouth power Jfets .......... FW J2
in Solid State
Napisano
Hello,I upper Jfet functions as an "impedance multiplier" John broskie explains the workings of this circuit in detail. (there are more discussions on it on his site)http://www.tubecad.com/2009/10/blog0174.htmIn short the reason to reduce the upper "sense" resistor is that in effect the inverse of the upper jfets transconductance is in series with already.