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Headphones "TA-56M" were produced since 1956 by the Tula factory "Octava". Phones are designed to work in special communications equipment, as well as for the needs of radio amateurs. Produced before the beginning of the 90s in four versions: high-resistance, 3200 and 1600 Ohms and low-resistance, 100 and 50 Ohms. Specifications: Frequency range 300 ... 3000 Hz. Dimensions of telephones are 190x175 mm. Weight with cord, 0.25 kg. Until the mid-80s, telephones were produced on a good metal holder with leather framing or leatherette, then on stamped plastic.