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The subscriber loudspeaker '' Farrand-3 '' has been produced since 1939 by the Moscow plant named after the twentieth anniversary of the October Revolution (formerly "Khimradio"). The loudspeaker is an upgrade of the previous model "F-1" and is designed for use in radio receivers and for the subscriber wired network. The loudspeaker is designed for a power of 0.25 V and a supply voltage of 30 volts. The input resistance is 2.4 kΩ. The price of the loudspeaker in those years was 25 rubles.