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Stereophonic telephones "TDS-3" from the beginning of 1977 were produced by the Ryazan Radio Plant.
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Phones are designed to listen to mono or stereo programs from various household radio equipment.
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The nominal power of the audio signal supplied to the phones is 1 mW, the maximum is 0.5 W.
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The range of effectively reproducible sound frequencies is 20 ... 20,000 Hz.
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The mass of telephones is 500 gr.
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Retail price 20 rubles.
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