This receiver was found in an Experimenter Magazine of 1950. The circuit is powered directly from the AC power line. L1 is formed by 80 to 100 turns of 28 or 30 AWG wire on a cardboard tube with 2,5 cm of diameter. L2 is formed by 10 to 20 turns of the same wire. The phone is a high impedance type. Antena is a wire 1 to 5 m long.
