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The loudspeaker "F-1" (Freischvinger) has been produced since 1937 by the Moscow Plant named after XX October.
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The loudspeaker was produced with and without a stand.
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The loudspeaker is designed to receive broadcast radio programs and to be built into the body of a radio receiver or speaker.
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Coil resistance 2.2 kOhm.
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Input voltage 30 volts.
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Power 0.3 W.
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The subscriber loudspeaker `` Farrand-3 '' has been produced since 1939 by the same plant.
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It is an upgrade of the F-1 model and is intended for use in radio receivers, acoustic systems and for a wired radio network.
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The loudspeaker is designed for a power of 0.25 W, with a voltage input of 30 volts.
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Input impedance 2.4 kOhm.
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