Radio receiver `` PR-5 ''
Receiving and transmitting radio equipment.The "PR-5" radio receiver was planned for release in 1932. "PR-5" is a professional long-wave, three-circuit, five-lamp direct current radio receiver with feedback and headphone reception. The range of received waves is 300 ... 20,000 meters. The receiver has five stages based on UB-107 lamps. The receiver is designed for receiving telegraph and commercial telephony.