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The network reel tape recorder Astra-4 from November 10, 1966 to IV quarter of 1974 was produced by the Leningrad plant Tekhpribor. The Astra-4 tape recorder replaced the Astra-2 tape recorder, which was released on December 31, 1966. The new tape recorder operates at 2 speeds of pulling the magnetic tape of 4.76 and 9.53 cm / sec. The recording time at the capacity of the coil with a tape is 350 meters 4 and 2 hours, respectively, at lower and higher speeds on two lanes. Rated output power 2, maximum 4 watts. The working frequency range at the linear output at a speed of 4.76 cm / s is 63 ... 6300 Hz and 63 ... 12500 Hz at a speed of 9.53 cm / s. SOI 4%. The detonation coefficient is 0.2% at a higher speed and 1% at a lower one. Power consumption 100 watts. Dimensions of the model - 420Ñ…320Ñ…190 mm. Weight 12 kg. Three 1GD-28 loudspeakers (1GD-18, 1GD-36) are installed in the tape recorder. LPM is driven by a KD-3.5 engine. The scheme is assembled on 5 finger lamps. Rectifier ABC-80x260. The tape recorder was produced in two versions. Earlier design of the tape recorder is described in the instruction number 1, and more modern in the instruction number 2. A small series from the I-Q in 1967 the tape recorder "Astra-4" was also produced at the Voronezh plant "Electropribor".