Stationary transistor radio `` Kristall ''.
Radiols and receivers p / p stationary.DomesticStationary transistor radio "Kristall" in 1957 was developed by the Leningrad NIIRPA them. A.S. Popov. A small-size radio receiver "Kristall" is assembled on eight crystal triodes according to a superheterodyne circuit. The radio has a push-button control of the power on and off mode, as well as range switching. Ranges: long waves 400 ... 150 KHz and medium waves 500 ... 1700 KHz. Sensitivity when receiving on a magnetic antenna in the range of DV - 3 mV / m, CB - 2 mV / m. When the receiver operates on an outdoor antenna, the sensitivity in both ranges is not less than 50 µV. Selectivity on adjacent channels at 10 kilohertz detuning, not less than 16 dB. Installation of radio components and assemblies is performed entirely on a printed circuit. The receiver is powered by a special eight-volt battery or rechargeable batteries. Dimensions of the radio receiver 320x260x190 mm. The radio receiver weighs 2.4 kg with a battery. Rated output power 50 mW, maximum 100 mW. When the receiver is operating for two hours a day, at an average volume, one battery is enough to operate the receiver for 6 ... 8 months. The receiver was experimental, made in several copies and did not go into production due to significant noise at low volume due to the imperfection of semiconductor devices of those years.