LV 1927
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Lapovy rectifier "LV" from I-kv 1927 produced electric break factories of low current. "LV" is intended for rectifying alternating voltage to constant voltage and replacing the anode batteries of the power of radio receivers with power from the electrical network. From the 4th quarter of 1927, the trust produced a type-II L-2 rectifier.
Documentation:
Information from collection of Valery Khartchenko