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The Stereophonic Transistor Electrophone Arctur-004-Stereo since 1981 has been producing the Berd Radio Plant. ESP is designed to listen to recordings from mono and stereo records and consists of a 2-speed EPU produced by Poland, ULF and 2 AC 25AC-309. There is an adjustment of the bass and treble tone, balance, low, mid and high frequency filters, electronic protection against short circuits in the load, control of the signal level using dial indicators. In the EPU there is a roll force compensator, adjustment of the rotational speed of the disc, auto-stop and microlift. EF works as an amplifier. The rotational speed of the disk 33.1 / 3 and 45.11 rev / min. Knock factor 0.1%. Rated output power 2x25 watts. The frequency range of sound pressure is 40 ... 20000 Hz. The background level is -50 dB. The harmonic coefficient of 0.2%. Power consumption 150 watts. Dimensions EF 610h390h250 mm. One speaker 480h285h261 mm. Mass EF 22 kg. AC 13 kg.