Seventy-five years ago this month, the June 1943 issue of Radio Craft carried this schematic for a simple one-tube all-wave receiver.  The set used a single  6F7 dual tube, half of which was used as the regenerative detector, with the other half serving as an audio amp. The circuit had been sent to the magazine by one Allan Hurd of Kelworthy, Ontario, who reported that the set pulled in the local stations with loudspeaker volume, and would even provide loudspeaker volume on shortwave from the London and Berlin stations. Presumably, weaker DX required headphones.

He also reported that no bandspread condenser was needed, as long as a good vernier dial was used on the main tuning condenser.