Hello,This is my Aikido_jfet version:
http://img535.imageshack.us/img535/8338/aikidojfet1nappi84.jpg
It simulates very good.
LTSpice Distorsion is very low, 0.06% with 1Vpp input and 6Vpp output:
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You can use no feedback but you gain much more.
It saves Aikido principle and could sound as Tube version but I haven't try it.
Good 2011!