Autotransformer `` AT-1 ''.

Power supplies. Rectifiers, stabilizers, autotransformers, transient transformers, etc.Regulating autotransformersThe AT-1 autotransformer was produced presumably since 1957. Not to be confused with AT-2 and AT-3 autotransformers, this is a different model of another enterprise. "AT-1" is intended for manual maintenance of voltage at 127 or 220 V when powering radio and television equipment with a power of up to 300 W when it is changed in the power grid.