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The radio center UK-50 has been produced since 1947 by plant number 662 of the Ministry of Industry and Communications of the Ministry of Communications Industry. The plant produced a 50-watt UK-50 radio node and a low-frequency U-50 amplifier. The latter are intended for work in sound-amplifying installations, and can also be used in small radio broadcasting nodes of local significance (in schools, clubs, collective farms, etc.). The radio center UK-50 Radio Node allows you to broadcast central broadcasting, as well as to broadcast from a local studio and play gramophone records. Installation coiled in an iron casing with a removable lid. Its dimensions are 1000x500x500 mm. The installation includes: U-50 amplifier, radio "VOSTOK", grammar-type motor "MS-1", piezoadapter, monitoring loudspeaker, output switch designed for closed (inside the building) broadcast network, as the installation UK-50 "has no lightning protection. The control loudspeaker allows the receiver and amplifier to be separately heard, so the receiver can be tuned while conducting local transmission. The design provides the ability to work from the central urban broadcasting network. Installation does not require adjustment and is ready to work immediately after connection. Transmission control is carried out by ear or by the output device of the amplifier. U-50 amplifier. The amplifier consists of two separate blocks (pre-amplification and terminal). The blocks are mounted on a common frame, fastened to the front panel. The amplifier was produced in a perforated case, and it is possible to install it without a case on the standard rack used for broadcasting equipment. Switches, regulators and devices are placed on the front panel. Input and output terminals, power plugs, fuses are located on the rear walls of the chassis blocks. Rated output power 50 W with SOI 4%. Irregularity of the main frequency response in the range of 50 ... 10,000 Hz 4 dB. ULF has 3 outputs of 15, 30, 120 volts. Microphone inputs are designed for ribbon or dynamic microphones.