[Reece]

My original adapter died a long time ago and so I rummaged around in my collection of wall-warts (isn't it amazing how many you can accumulate over the years from various devices) and tried one with 9VDC out at 9ma. The radio plays fine with that at good volume. If you can find one with a bit more ma. that would be good. I also stuck a 1000 mfd. cap @35V across the power input of the radio for more filtering. Depending on the "wart" you may or may not need more filtering. Any good size (mfd) electrolytic at 20 volts or so would probably work. I can't remember on the power connecter whether the center pin is + or - since I just wired my adapter in direct since I never use batteries in this radio.

Something I know I need to do is replace the electrolytics in this radio and clean the bandswitch and controls because after 45 years I know the caps are dried out. Usually new 'lytics in an old transistor radio will brighten it up.