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Reel tape recorder "Sonata" prepared for release since 1966 the Velikoluksky radio plant. The two-speed "Sonata" tape recorder is made on the basis of the LPM of the "Chaika-66" tape recorder and is intended for recording and playback of phonograms. There is a separate adjustment of the level of recording and playback, the ability to listen to the recording on the loudspeakers, temporarily stop the tape, without erasing the impose on the old recording a new one. The tape recorder is designed for type 6 magnetic tape and its parameters are specified for use with this tape, but other tapes can be used. The speed of movement of the magnetic tape is 19.05 and 9.53 cm / s, the detonation coefficient is 0.3 and 0.6%. The duration of continuous recording at a speed of 9.53 cm / sec when using 250 m. Coils with a tape of type 6 - 2x45 minutes. The frequency range of the through channel in the electric path at a speed of 19.05 cm / s - 40 ... 12500 Hz, at 9.53 cm / s - 63 ... 1000 Hz. The noise level is not worse than -40 dB. Nominal output power of 1 W with a THD on the LW 4% on the loudspeakers 5%. LF Tone Adjustment Range ± 6 dB, HF 10 dB. Sensitivity from a microphone input of 3 mV, receiver and pickup 150 mV. The speaker of the tape recorder consists of two 1GD-28 loudspeakers developing sound pressure of 0.8 N / m2. Food from a network of 127 or 220 c. Power consumption 80 watts. Dimensions tape recorder 158h315h376 mm, its weight 10 kg.