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Short-wave converter "K-2" from the beginning of 1934 produced the Leningrad Kazitsky plant. Converter "K-2" is an auxiliary device that allows reception of short-wave radio stations operating in the range from 19 to 62 m to long-wave receivers: "EKL-34", "EKL-4", "EFS -4 '', '' ECS-3 '', '' ECS-2 '', '' SI-235 '' and others. Powered by a 120 volt AC network.