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Since 1965, the transistor radio Sonata has produced the Leningrad plant Radiopribor. Portable four-band transistor receiver "Sonata" was produced in several variants of external design. The radio receiver differed from similar models in modern design, good sound quality, high electrical and operational parameters. The range of received radio waves: LW - 150 ... 408 kHz (2000 ... 735 m), CB - 525 ... 1605 kHz (571.2 ... 187.0 m), KV-1 - 3.95. ..7.4 MHz (75 ... 41 m), KV-2 - 9.0 ... 12.1 MHz (31 ... 25 m). The maximum sensitivity of the RP in the ranges of DV is 1.0 mV / m, SW - 0.5 mV / m, KV - 50 ÂµV. The real sensitivity is 2.0 mV / m, 1.0 mV / m and 200 ÂµV. Selectivity on the adjacent channel in the ranges of the Far-Far East and the Ground Voltage not less than 34 dB. Selectivity on the image channel in the DV ranges - 32 dB, CB - 26 dB, KV - 12 dB. The intermediate frequency is 465 kHz. Rated output power 150 mW. KPD with a maximum output power of 40%. Nonlinear distortion over the entire path is about 8%. The frequency response for the sound pressure of the entire path in the CB and DV bands is no longer 200 ... 4000 Hz (with non-uniformity of 14 and 18 dB). The radio receiver has a timbre regulator which provides a response to the frequency response of 4 kHz - 12 dB. The volume control provides sound adjustment within 40 dB. The receiver is powered by 2 KBSL-0.5 batteries connected in series. The dimensions of the receiver are 252x143x68 mm, the weight with the power source is 1.9 kg. The model provides the ability to connect a headset or an additional speaker, external power supply, antenna and grounding. Normal operation is achieved at temperatures from -10 Â° to 45 Â° C. Export radios had HF subranges from 16 to 50 meters.