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The control and regulating autotransformer '' Ð ÐТ-0,25 '' presumably since 1960 produced the Zaporozhye transformer plant. The autotransformer is designed to manually maintain a voltage of 220 volts when it changes in the electrical network from 143 to 245 volts. The autotransformer '' PAT-0,25 '' is designed to power any household radio equipment with a capacity of not more than 250 watts.