http://www.diyaudio.com/forums/showthread.php?s=&threadid=71633&perpage=10&pagenumber=1

The rest of the items are very much off the shelf, junkbox
to boutique. The only difficult thing would appear to be
heatsinking the less common package of the JFET.

Discussion of the JFET amp

http://www.diyaudio.com/forums/showthread.php?s=&threadid=64292

This thing intrigues me because it looks like you could easily
choke load it (if you could find the high-current choke), or
use two modules in push-pull. Maybe even feed two modules with
a center-tap-primary transformer just like a PP tube amp. It
all seems approachable if you're willing to stand way back
when you power it up in the middle of your back yard.

Skip