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The head phones "Ton-2" and "Ton-2A" were produced since 1961 by the Tula factory "Octava". Designed for use with various radio equipment. Phones of the type "TON-2A" differ from the phones "TON-2" by the absence of a volume control and input resistance of 100 Ohm at a direct current, while the base phones have a resistance of 3.2 kΩ. Both headphones were available with or without rubber headphones. The handset phones also had several versions.