Spice JFET and MOSFET´s .model
Accordingly to this stuff, and manufacturer´s data sheet, I have made my own .models for some common JFET´s And MOSFET´s for Spice soft. I want to share them. In few time I´do for other field effect transistors. Those has been tested in a simulation of a reality working circuit, my OSF. Enjoy.
.model 2SK117Y NJF(beta=6.323m vto=0.547 is=1n cgd= 8.0445p cgs=4.9555p lambda=65.89 mfg=TOSHIBA) .model 2SK117GR NJF(beta=13.7m vto=0.547 is=1n cgd= 8.0445p cgs=4.9555p lambda=30.41 mfg=TOSHIBA) .model 2SK117BL NJF(beta=30.55m vto=0.547 is=1n cgd= 8.0445p cgs=4.9555p lambda=13.64 mfg=TOSHIBA) .model 2SK170GR NJF(beta=13.7m vto=0.547 is=1n cgd= 16.089p cgs=13.91p lambda=20m mfg=TOSHIBA) .model 2SK170BL NJF(beta=28.283m vto=0.547 is=1n cgd= 1.119p cgs=11.881p lambda=9.72m mfg=TOSHIBA) .model 2SK170V NJF(beta=47.14m vto=0.547 is=1n cgd= 1.119p cgs=11.881p lambda=5.833m mfg=TOSHIBA) 
This is interesting .Thanks a lot !

More models
Here are more model generated of my own:
.model 2SJ103Y PJF(beta=1.053m vto=1.342 is=1n cgd=8.0445p cgs=4.9555p lambda=34.8 mfg=TOSHIBA) .model 2SJ103GR PJF(beta=2.283m vto=1.342 is=1n cgd=8.0445p cgs=4.9555p lambda=16 mfg=TOSHIBA) .model 2SJ103BL PJF(beta=5.092m vto=1.342 is=1n cgd=8.0445p cgs=4.9555p lambda=7.2 mfg=TOSHIBA) .model 2SK246Y NJF(beta=13.7m vto=0.648 is=1n cgd=16.089p cgs=13.91p lambda=35.14m mfg=TOSHIBA) .model 2SK246GR NJF(beta=28.283m vto=0.648 is=1n cgd=1.119p cgs=11.881p lambda=16.22m mfg=TOSHIBA) .model 2SK246BL NJF(beta=47.14m vto=0.648 is=1n cgd=1.119p cgs=11.881p lambda=7.274m mfg=TOSHIBA) .model 2SK389GR NJF(beta=13.7m vto=0.547 is=1n cgd=14.74p cgs=10.25p lambda=6m mfg=TOSHIBA) .model 2SK389BL NJF(beta=28.283m vto=0.547 is=1n cgd=14.74p cgs=10.25p lambda=2.9m mfg=TOSHIBA) .model 2SK389V NJF(beta=47.14m vto=0.547 is=1n cgd=14.74p cgs=10.25p lambda=1.74m mfg=TOSHIBA) 
:cop: 2SJ103 model corrected per Osvaldo's request.

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Apologize by the inconvenience. Here I add one more: .MODEL 2SK2692 NMOS(mfg=TOSHIBA LEVEL=3 L=1n W=5.952 KP=62.5u VTO=1.265 CGSO=120p CGDO=20p) Good luck! 
Wooo Hooo! Much thanks

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For example: The real circuit was giving near 10Vpp at 440Hz immediately after clipping with 12V power supply, and the first models I found and use, clip with 8.3V or so. With my selfmade models, clipping was very near 10V, circa 9.8V. So model appears to be more accurate. And none of them make difference between manufacturer's IDSS range, mine does. Enjoy. 
The Cgd values for differtent grades of 2SK170 & 2SK246 are inconsistent, and I believe incorrect.
Patrick 
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