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The portable tube radio receiver "Koyo Parrot KR-4S1" was produced presumably since 1954 by the Japanese company "Koyo Denki Ltd".
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The radio is assembled on 4 miniature radio tubes.
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Powered by 2 batteries with a voltage of 1.5 and 45 volts.
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The AM range is 540 ... 1600 kHz.
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Magnetic ferrite antenna.
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Sensitivity is about 10 mV / m.
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Rated output power 20 mW, maximum 40 mW.
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The range of reproduced sound frequencies is 250 ... 3500 Hz.
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Dimensions of the radio receiver 128x83x38 mm.
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Weight with batteries 535 grams.
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