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The Aidas reel tape recorder (Elf-20) since 1962 has been producing the Elf Electrotechnical Plant in Vilnius. The tape recorder is intended for amateur recording of phonograms from a radio receiver, record player, microphone, radio line or other tape recorder. Sensitivity from a microphone input of 3 µV, a pickup or a receiver of 260 mV, a radio line of 10 V. A 2-track tape recording system of type 2 or 6 is used in the tape recorder. The speed of the magnetic tape pulling is 19.05 cm / sec. The tape recorder is equipped with cassettes No. 15, with a capacity of 250 meters of tape and a recording time on two tracks of 45 minutes. The operating frequency range of the electrical path is 40 ... 12000 Hz when working with tape type 6, on a tape of type 2 the range is already 50 ... 10000 Hz. The nominal output power is 1 W with a distortion coefficient at the linear output of 3%, and at the equivalent of a loudspeaker 6%. The noise level is 40 dB. The detonation level of 0.4%. The tape recorder is powered from the network. Power consumption 80 watts. Dimensions of the model 400x300x186 mm, weight 12 kg. The name Aidas (Aidas) in translation from Lithuanian is Echo.