The F7 is a very unique power amplifier, a two-stage push-pull JFET/MOSFET topology with fewer parts than any First Watt amplifier to date and incorporating a very interesting balance of very low negative voltage feedback and a little bit of positive current feedback to give an astonishing measure of control over reactive loudspeaker loads.

The F7 is now in production. Here is a link to the first of many reviews: F7 at 6moons Availability is March 2016 at a list price of $3000.