I've held off in laying this one out just for the name alone (it was banned from Reverb for this very reason), but the circuit is fairly interesting so it was time. It features a MOSFET buffer into a pretty standard opamp gain stage with LED clipping into a MOSFET gain stage. Schematic and discussion over on FSB. I took a few liberties with the power section simplify it and make it all fit in a 1590B.