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Headphones "TON-2M" were produced since 1986 by the Tula factory "Octava". Phones are designed to work in a low-voltage radio broadcasting network, with a voltage of up to 30 volts. Frequency range 300 ... 3000 Hz. The DC resistance at the input of the plug is 3 kΩ, and the alternating current is 12 kΩ.