The Radiola RS is the same 1 tube regenerative receiver with a stage of audio added and placed in the same sized box as the other "Aeriola/Radiola" series. It's the forerunner of the Radiola III. The last of the series was the Radiola AC (2 stage audio amplifier), which I don't have and am seeking. E-mail me if you have a nice one for sale or trade.

instruction manual available