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The autotransformer Voltage Regulator "ARN-400" from the beginning of 1965 produced the Moscow Kuybyshev Transformer Plant. ARN-400 is designed to power TVs, radios and other radio or electrical equipment by manually maintaining a voltage of 220 (127) volts when voltage changes in the electrical network in the range from 140 to 245 volts (or from 90 to 150 V during operation at 127 V) at power in load up to 400 watts.