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Since 1951, the subscriber loudspeaker "Chaika" was produced by the Kuybyshevsky plant Ekran and the Omsk electrical engineering plant named after Karl Marx. Chaika is a standard AG produced in a new (for that time) GOST, designed for a broadcasting radio network with a voltage of 15 or 30 volts. Frequency range 150 ... 5000 Hz. The mass of the loudspeaker is 1 kg.