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Headphones "TA-4" were produced presumably since 1957 by the Tula factory "Octava". Phones are designed to work in special communications equipment, as well as for the needs of radio amateurs. Produced in 2 versions: high resistance, resistance of 2200 Ohms and low resistance, resistance of 65 Ohms. Specifications: The range of reproducible sound frequencies 300 ... 3000 Hz. Dimensions of telephones are 190x175 mm. Weight with cord, 0.27 kg.