Hello Randy, IC-7800: A low noise switching power supply is built in. IC-7700: Quiet, built-in switch-mode mains power supply. 73, Hans Remeeus (PA1HR) http://www.remeeus.eu Communication is about people, the rest is technology. Randy schreef: > Do the IC-7700 and 7800 use switching or analog power supplies? > > de Randy, W7HR > Port Orchard, WA > >