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The portable small-sized tube radio receiver "Privat-ear 5-DS-001" was produced since 1949 by the American company "Electronics Systems", Kansas City.
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The radio receiver is assembled according to the regenerative scheme on two miniature radio tubes.
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The volume control changes the feedback.
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When the volume is minimal - the receiver operates in direct gain mode with minimal sensitivity and selectivity.
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With increasing feedback, sensitivity and selectivity increase, which can reach large values "u200b"u200bof 1 mV / m and 46 dB.
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Power supply - one 22.5 volt battery and two AA batteries of 1.5 volts each.
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