The plans for this one-tube loop set appeared 85 years ago this month in the May, 1938, issue of Radio Craft. While the tuning range is not specified, it appears to be for the broadcast band, and the set was said to give the beginner many hours of enjoyment both putting it together and using it.

According to the magazine, the set was able to pull in signals inside a steel framed building, with enough volume to rattle the headphones.

While it was not primarily intended for use as an interference finder, the directional characteristics of the loop antenna made it well suited for that purpose.

The same issue of the magazine also showed how to make the one-tube all wave receiver shown at the right.  It also included instructions for adding an additional AF stage.