Seventy-five years ago this month, the August 1946 issue of Radio Craft carried this simple circuit for a one-tube receiver. The circuit had been sent in to the magazine by one Robert Sherrington of High Prairie, Alberta, who noted that the circuit was very selective and would pull in locals with good volume on a loudspeaker. It employed a 117L7GT, half of which served as a rectifier, with the other half serving as a regenerative detector.

The designer of the circuit was almost certainly the same Robert Sherrington, who was 16 at the time he sent the circuit into the magazine. According to his 2015 obituary, he attended the Radio College of Canada in Toronto in 1949, and then owned a radio repair shop in High Prairie. He later moved to British Columbia, where was licensed as VE7DLX.

The magazine’s editor noted that the circuit, while unusual for the time, was not new, having been used in earlier receivers, including the Reinartz.