Eighty-five years ago this month, the February 1934 issue of Short Wave Radio magazine carried the plans for this two tube (plus rectifier) receiver.  Dubbed the “Globe Trotter,” the set covered shortwave and the standard broadcast band thanks to plug-in coils.

The set used a type 57 tube as regenerative detector, with a type 2A5 tube serving as audio amplifier to drive a speaker. A type 80 full-wave rectifier rounded out the tube compliment.

The set would be difficult to duplicate today. It employs a transformer which is probably unobtainium. The hardest to find component might be the dynamic speaker. Instead of a permanent magnet, this type of speaker used a field coil, which magnetized the speaker, and also served as a filter inductor for the power supply.