Seventy years ago, the October 1955 issue of Radio Electronics showed how to build this receiver, dubbed the DX Tiny Tuner. It was a miniature unit, designed for long-distance reception on the broadcast band. From a suburb of New York, the set picked up stations in Bridgeport (600 kHz), Philadelphia (610 kHz) and Newark (620 kHz). This compared with a good transistor set that picked up the 600 kHz station with a background of the one on 620, with no sign of the station on 610.

The author noted that the tiny set would pick up any station heard on a communications receiver of S2 or stronger. And surprisingly, it did it with the built-in antenna.

The superhet circuit used three subminiature tubes and one transistor.