Radio receiver `` PD-4 ''.

Receiving and transmitting radio equipment.The radio receiver "PD-4" from the middle of 1936 was produced by the Leningrad hardware plant. Kazitsky. The "PD-4" radio receiver is designed to receive radio stations operating by telephone and telegraph in the range from 200 to 20,000 meters (1500 ... 15 kHz). The entire wavelength range is covered by the connection of interchangeable coils. The receiver is assembled on four battery-operated radio tubes. Read more about the PD-4 radio receiver and its technical parameters in the instructions.