This is an improved version of the original Model 9 “breadboard AM radio. The changes from the earlier version include replacing the Variometer with a coil and an adjustable capacitor, and removing a potentiometer.
The set uses one 201A tube 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.
This radio is on display on the Wireless Building.