Seventy years ago, this gentleman undoubtedly had the smallest radio in the ballpark to pull in the play by play, thanks to this miniature radio described in the September 1952 issue of Popular Science.

A few years later, the same circuit could be duplicated with transistors, but this one relied upon acorn tubes designed for hearing aids. The earphone was also one designed for that purpose. The three-tube set featured a regenerative detector, and the regeneration control could be used as a volume control, but only over a limited range. For more volume, the article suggested clipping the antenna to a larger metal object. For normal use, a 3-foot wire served as antenna.

The radio was mounted in a small plastic box said to be about the same size as the proverbial cigarette pack.

The set featured permeability tuning. The coil had to be wound at home, but the author showed how to do it easily with a hand drill clamped into a vice.