The transistor network microphone "Sonnet-208-stereo" since the fall of 1986 was produced by the Kazan Electrotechnical Plant.
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The stereo Sonet-208-stereo microphone consists of an electric player with an audio frequency amplifier and 2 small-sized speaker systems.
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The model has an EPU of type 2-EPU-71C with a low-speed engine and a magnetic head with a diamond needle from the Belgian company Ortophone.
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The EPU has a self-locking device for adjusting the speed of the disk.
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The microphone can also be used as an ultrasonic scanner, sources of sound signals can be connected to its inputs, there is a stereo phone jack.
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The ultrasonic device has protection against short-circuit in the load, the speakers have built-in overload indicators.
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The speed of rotation of the disk 33, 45 rpm
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The detonation coefficient of 0.1%.
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Nominal operating frequency range for voltage 20 ... 25000 Hz, sound pressure 63..16000 Hz.
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THD 0.5%.
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Transient attenuation between channels 45 dB.
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The dimensions of the model are 400x365x155 mm.
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AC - 265x175x160 mm.
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Weight 6.5 and 3.3 kg.
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Price with speakers 220 rubles.
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Since 1988, the Sonnet EF-208C electrophone has been produced.
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In 1990, the microphone was modernized and produced with the name "Sonnet EF-208S-2."
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The main differences of this model from 208 are a different design, electronic switching of input modes and mono / stereo mode, the absence of an AC mute button.
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The speaker was automatically turned off when the headphones were connected.
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The power amplifier is assembled on transistors or on 2 microcircuits of the TDA-2030 type.
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