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The autotransformer "AT-2" presumably since 1957 produced several enterprises of the country, in particular, Kharkov and West Siberian SNH. "AT-2" is intended for manual maintenance of 127 or 220 V voltage when powered by radio-television equipment with a power of up to 250 W when it changes in the network. The autotransformer AT-2 of the Novosibirsk plant Elektrosignal was produced first and had a slightly different design, then in 1960 it was modernized.