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Since the beginning of 1950, the collective farm radio unit KRU-10 has been producing the Kirov Petropavlovsk Plant. For radio broadcasting of large collective farms located in rural areas that do not have electricity and non-permanently operating electrical grids, the radio industry produced the radio-broadcasting center KRU-10. He could serve up to 200 radio outlets equipped with economical loudspeakers. The radio node includes a receiving-amplifying device, a power unit, a lightning protection shield, two acid / alkaline 12 V batteries with a capacity of 60 a / h each, a monitoring loudspeaker of the type "North", a pair of headphones, a set of connecting hoses, spare parts ( lamps, vibrators, lightning arresters, fuses). KRU provides broadcasting of radio stations of central and regional broadcasting operating in the DV, MW and HF bands, reproduction of phonograph records using a pickup, as well as transmission from a microphone (a control loudspeaker can be used as a microphone). Glow in the switchgear lamps is powered by a single cell of an acid or two cells of an alkaline battery. Anode voltage is obtained from 2 synchronous vibration transducers operating from the rest of the battery. Charging is performed through the selenium rectifier from the GPM-130 three-phase alternator, VE-2 wind generator or AC mains available in the power supply unit. In this case, the voltage is supplied to the selenium rectifier through a step-down transformer.