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The autotransformer "ARN-250" from the beginning of 1957 produced the Moscow Kuybyshev Transformer Plant. Autotransformer type "ARN-250" (Autotransformer Voltage Regulator, with a load power of up to 250 watts) is designed to power TVs, radios and other radio or electrical equipment with a voltage drop in the electrical network regulated by a voltmeter of 220 volts. In the years 50 ... 80 in the evening, the voltage in the urban power grids was reduced to 170, and in the district and to 140 or even lower due to the inclusion of lighting and televisions by the population. And in winter, the values "‹"‹reached even lower values. In the mornings, by the way, on the contrary, the voltage could reach 235 V and more, which could be reduced to 220 V. A convenient thing and uncomfortable, constantly had to monitor the voltmeter and twist the regulator every 20 ... 30 minutes.