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From the first quarter of 1931, the radio grid mains "EShS-2" was produced by the Moscow Electrotechnical Plant Moselektrik, later the Moscow Electromechanical Plant named after Sergo Ordzhonikidze. The ECHS-2 radio receiver (Shielded, Four-lamp, Network, 2nd version) is one of the first domestic radio receivers with AC power with a voltage of 110, 120 or 220 V on radio tubes of indirect heat. The receiver is built on a regenerative scheme of direct amplification 1-V-2 with three circuits and adjustable feedback. The range of received waves is 200 ... 2000 meters, divided into four subranges. The output power of the receiver is 0.8 ... 1 W. It is possible to play gramophone records from an external electro-reproducing device. More details about the model in the documentation below. However, when reading, there is some inconsistency in the release dates and names. Description of the receiver "ESD-2" in the brochure ONTI for 1935. Description of the receiver in the reference book of R. Malinin for 1937. First impressions of the receiver in the magazine Radio Front number 7 and 8 for 1932. "ESD-2" on trial, an article in the journal Radio Front number 9 for 1932. Description of the receiver in an unidentified directory for the 30s. Description of the model in the EA Levitin reference book for 1939. Description of the model in the reference book Broadcast Receivers for 1941. Operation receiver "EHS-2".