Eighty years ago this month, as shown in the June 1941 issue of Popular Mechanics, Junior was so pleased with his new crystal set that Dad decided to make a second one for himself. The set was so small that it was built right in to an old set of “Baldwin” style headphones, which had an extra large Bakelite shell and cap to house the set.

Into the bottom of the shell was placed a spiderweb coil, and the the shaft of a small tuning condenser was mounted in a hole drilled in the bottom. A wire with a spring clip was used for the optional but recommended ground connection, with another for any convenient antenna.