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The reel tape recorder of the 3rd class "Dyna" (Elfa-29) was produced by the Vilnius Electrotechnical Plant "Elfa" from the beginning of 1969.
The Dyna tape recorder is fundamentally different in design and layout from the models previously produced by the factory.
It provides recording and playback of phonograms from any sound source.
The tape recorder has two tape speeds of 9.53 and 2.38 cm / sec.
The first is used when recording music, and the second was introduced specifically, by order of the All-Union Society of the Blind to listen to phonograms such as "Talking Book" and record speech.
VLP tape recorder differs from the VLP devices previously produced by the factory.
At the same time, in the new tape recorder some nodes are preserved that have proven themselves in previous models.
The machine"™s LPM is powered by a KD-3,5 electric motor serving two kinematic circuits.
The universal amplifier of the tape recorder is based on the amplifier of the tape recorder Aydas-9M (option 2), and the changes affected the introduction of a lower speed and treble tone control.
The duration of sound when working with coils No. 18, containing 360 m of type 6 magnetic tape at a speed of 9.53 cm / s - 2x60 min, at a speed of 2.38 cm / s - 2x240 min.
The frequency range on the drug at a speed of 9.53 cm / s is 40 ... 12500 Hz, 2.38 cm / s - 200 ... 3500 Hz.
Noise level is not worse than -44 dB.
Detonation is ± 0.3% at a speed of 9.53 cm / s and ± 5% at a speed of 2.38 cm / s.
The maximum output power is 1.5 watts.
The device is powered from the mains.
Power consumption 70 watts.
The dimensions of the tape recorder are 370x240x155 mm.
Weight 10 kg.