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The autotransformer adjusting household "ARB-250" (Lotos-1) was produced since 1981. He is a modernization of the previous model "ARB-250" (Lotos). Modernization has been reduced to the replacement of a switch voltmeter cathode. Due to the impossibility of its operation at low voltages, the autotransformer is designed to manually maintain the output voltage of only 220 volts, when the input voltage changes from 150 to 250 volts. Load power not more than 250 watts.