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Since 1967, the network transistor "Concert-3" electrophone has been manufactured by the Moscow Experimental Plant of the All-Russia Scientific-Research Institute "Elektroprivod" and the Moscow Plant "Agregat". The "Concert-3" electric phone (type EF-66) is designed for playing regular and long-playing records at speeds of 16, 33, 45 and 78 rpm. The speaker system consists of two 1GD-28 loudspeakers and can be assigned to the distance of up to 1 meter from the microphone. Output rated power amplifier LF - 1 W, the maximum - 3 watts. The range of reproduced sound frequencies is 100 ... 10000 Hz. The power consumed from the mains is 30 watts. Mass EF - 7 kg. The microphone was produced with 2 types of tonearms and pickup heads.