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The transistor "Concert-301" and "Concert-201" network transistors from I quarter of 1972 and 1973 were produced by the Moscow Pilot Plant "Agregat". The stationary two-unit "Concert-301" electrofon consists of the "Concert-M" electroplaying device and the "Escort" electroacoustic unit. ESP type III-EPU-28M is designed for three disk rotation speeds of 33, 45 and 78 rev / min. Another EPU could be used. The photo in the model used II-EPU-40. Pickup head type GZK-661A. The range of reproduced frequencies at the output of the pickup is 150 ... 7000 Hz. Dimensions of the electric player 350x320x150 mm, weight 4.5 kg. Electro-acoustic unit "Escort" began to be produced back in 1971. It consists of a low-frequency amplifier, a network power supply unit and an speaker where the 4GD-28 type front-mounted wideband loudspeaker is installed. The amplifier is made on 9 transistors. The maximum output power is 4 watts, the audio frequency range is 100 ... 10000 Hz. The dimensions of the block are 350x320x125 mm, the mass is 4.5 kg. In 1973, the phone was upgraded by improving the electrical circuit of the acoustic unit, installing EPU type II-EPU-40 and in this regard, transferred to the 2nd class. The new model was called "Concert-201". About the model, see below.