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The tube amplifier terminal "UO-11" was supposedly produced since 1970 by the Kinap plant.
The UO-11 type amplifier was included in the sets of monophonic sound-reproducing equipment ZVUK 1-25-3, ZVUK 1-25-4 and ZVUK 1-25U intended for the equipment of cinema halls and cinema installations with an auditorium with a capacity of up to 300 seats
.
Below, in the book of Cherkasov Yu.P.
The Handbook of Cinema Mechanics (2nd edition, 1988), in subsection 2.3 (p. 281), the UO-11 amplifier is described in detail together with a preamplifier with circuits and other sets equipment.
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