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The "Concert" electric player (EP-66) has been producing the Moscow Experimental Plant VNI Electric Drive since the beginning of 1967. The "Concert" electric player is designed to play records together with the amplifying equipment. The "Concert" electric player is of type EPU III-EPU-28, designed for three disc rotation speeds: 33, 45, 78 rev / min. A power transformer is installed in the electric player, supplying 127 volt electric control devices, while in the electric network it is usually 220 volts. The output of the cartridge, through a shielded wire and two connectors can be connected to the low frequency amplifier with a speaker system. The electric player has a frequency range of 100 ... 10,000 Hz. The "Concert" electric player was mainly used in schools for lessons requiring records.