TSN-170 (Priboj) 1962
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Voltage stabilizer "Surf" (TSN-170) was produced from the beginning of 1962. Ferroresonant stabilizer "Surf" is designed to supply a variable stabilized voltage of 220 volts, when it changes in the electrical network of any TVs with a power consumption not exceeding 170 watts.
Information from collection of Valery Khartchenko