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The stabilized source of anode voltages "SIAN" was produced presumably since 1950. The source is intended for laboratory work related to the development and testing of lamp radio equipment. The source has four output voltage limits. 150 V, where the output voltage is continuously adjustable from 80 to 150 V. 220 V, where adjustment is possible from 100 to 240 V. 290 V, where adjustment is possible from 130 to 320 V and 360 V, where adjustment is possible from 160 to 400 V. The load current must not exceed 300 mA. Unstabilized AC voltages are present: 4 and 6.3 V; with a load current up to 6 A.