The plans for this unusually designed one-tube regenerative receiver appeared a hundred years ago this month in the May 1924 issue of Popular Mechanics. Nothing about the circuit, using a UV199 tube, is particularly remarkable, other than the way it’s put into effect. The main coil is stationary, but the antenna coil and ticker coil are adjustable. They are all wound spiderweb style. To increase antenna coupling, you move the antenna coil closer to the main coil. To increase regeneration, you move the tickler coil closer.

According to the article, the set could be constructed of the odds and ends that can be found on any radio enthusiast’s worktable.