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Selenium rectifier "VSA-10A" was produced presumably since 1957. Designed to charge car starter batteries with a capacity of 42 to 135 a / h with a voltage of 11.8 ... 13.8 V. The rectifier can be used to charge any other batteries, as well as a source of constant (rectified) current for others goals. The rectifier is powered by an alternating current network of 127 or 220 volts.