Eighty five years ago, these hunters are enjoying a radio program while out in the wilderness, thanks to a three-tube superhet shown in the September 1940 issue of Popular Mechanics.

The set was built into a 49 cent overnight bag, and was powered by four flashlight batteries in parallel for the filaments, and two 45 volt batteries for the B+. The B batteries were said to last for nine or ten months.

The tube lineup consisted of a 1A7-GT mixer, followed by a 1A5-GT IF amp, and then a 1D8-GT detector and audio amplifier. A loop antenna was built-in and the efficient circuit supplied satisfactory loudspeaker volume.