This is the original version of the Model 10A 4340 “breadboard” AM radio. The changes from the earlier designs include replacing the Variometers with coils and adjustable capacitors. This was Atwater Kent’s first really successful radio to use a fixed inductor and a variable capacitor for tuning, after the short lived Radiodyne.
This one has the vertical coils, but only has a little molded part where the binding posts went on earlier versions. It does not have the binding posts on the top of the tube sockets like the Radiodyne. The wiring on the bottom matches other Model 10A 4340 receivers we have.
Atwater Kent 10A 4340 #2 LabelThe set uses two 201A tubes for the Radio Frequency section, a 200 tube for the Detector, and two 201A tubes for the Audio Amplifier. We could use a 200A tube with a thoriated tungsten filament for the Detector and reduce the total filament current by 0.75A. These were common tubes, so we should have plenty in the Museum’s inventory.