Souped up HBR receiver, based on a Ted Crosley design..
http://www.qsl.net/k5bcq/HBR/hbr.html
It is turning into a bottomless money pit!

Looks like a fun project.

The schematic has similarities to the National NC300 that I am currently
restoring. I heard the NC303 has some nice engineering differences that
enhance it's performance.

Good luck,

Paul P.