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The radiogramfon Concert-2 (EF-4) has been producing the Moscow Electric Machine Building Plant since the beginning of 1962. The radiogramfon Concert-2 is designed on the basis of the Concert electric player. It operates on ac mains of 127 and 220 volts and is designed to play normal and long-playing records at disc speeds of 78, 45, 33 and 16 rpm. Autostop inertial, triggered by the movement of the needle on the treadmill plate. An amplifier with a push-pull output stage provides a frequency range from 30 to 15,000 Hz, with a non-linear distortion factor of 3% and a maximum output power of 5 watts. The low-frequency amplifier is loaded onto two 2GD-3 loudspeakers connected in series with different resonant frequencies of 80 and 100 Hz. The loudspeaker provides a frequency band with a sound pressure of 90 ... 10,000 Hz. Piezoelectric ultrasonic pickup ultrasonic crystal with a crystal of segnetovoy salt. Its frequency range is 50 ... 10000 Hz. A radiogrammer consumes about 70 watts of power. It is decorated in a cardboard suitcase and pasted over with a leather substitute.