The plans for this unusual looking two-tube receiver appeared in Popular Science 80 years ago this month, May 1941. The controls were mounted on top of the chassis, meaning that the added expense of a front panel was unnecessary.

The set is billed as having two detectors. In reality, a 1N5G tube is used for the detector, with regeneration provide by a 1G4G following it, with that tube’s output being fed back through a tickler coil to the first stage. This made the set very efficient, to the point where it would be able to operate a speaker directly at some locations. The detector could also serve as an audio amplifier, allowing a crystal phonograph pickup to be hooked in as shown in the schematic below. With the appropriate plug-in coil, the set could be used for shortwave.