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Phones Dynamic Stereo "Electronics" TDS-22 and "Electronics" TDS-22-2 were produced from 1987 and 1988 by the Kaluga ON "Grant". The compact in-built phones "Electronics" TDS-22 and "Electronics" TDS-22-2 are designed for individual high-quality listening to mono or stereo sound phonograms. Nominal frequency range of 20 ... 20000 Hz. Resistance is 100 Ohms. Rated power 0.1 mW.