jadi jpThe front-end featured the Jadis JP 80MC full-function preamp, the Air Tht ATC-2 -level preamp, the Theta DS Pre dital processor (with snal obtained from Tape Out),The best tubes have always been Telefunkens. Mine has all Telefunken 803S. Also agree you should avoid any mods to Jadis equipment. Had one done on the JP-200