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Portable reel tape recorder "Spring-3" from the beginning of 1967 produced Zaporozhye plant of mobile power plants. The recorder of class 3 "Spring-3" (the last in the series of reel spring models) is designed to record and play sound phonograms from a radio receiver, sound pickup, microphone and radio network. LPM is powered by the engine DKS-16. The speed of the tape is 9.53 cm / sec. The recording duration when using coils with 180 m. Of type 6 tape is 2x30 minutes. Using tape type 10 increases the time to 2x45 minutes. The operating frequency range of the sound on the linear output is 63 ... 10000 Hz, on its loudspeaker 100 ... 10000 Hz. Rated output power 0.5 watts. The speaker installed 1GD-28. Power - 8 elements of A-373 or from the network through the power supply. Power consumption of 20 watts from the mains. The dimensions of the tape recorder are 358x234x121 mm, weight 5 kg. The first tape recorders had a different design.