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From the autumn of 1933 and March 1935, the radio network lamp "EShS-3" and "EShS-4" produced the Moscow EMZ. S.Ordzhonikidze. Receivers "ÐЧС-3" and "ÐЧС-4" are the same in principle, with the exception that "ÐЧС-4" has a built-in loudspeaker, therefore its appearance differs from the model "ÐЧС-3". The receivers are designed to be powered from an AC network with a voltage of 110, 120 or 220 V. According to the scheme, these are regenerative direct amplification receivers of the type 1-V-2 with 3 tunable circuits. The output power of the bass amplifier 0.8 ... 1 W. The wavelength range is 200 .... 2000 meters, divided into 4 subranges. There is an adapter input for playing gramophone records by an external electric player. All parts of the receivers are mounted on a metal chassis, mounted on the bottom of the case with a removable rear wall. Four control knobs on the front and side walls. Front knobs for setting, volume and feedback, on the right side wall is a range switch. On the rear wall are: power switch, antenna and ground jacks, adapter and loudspeaker. At the ECHS-3 receiver of such nests there are two pairs, for low-resistance and high-resistance loudspeakers, at the ECHS-4 receiver, one pair for an external low-impedance loudspeaker (its loudspeaker is switched off when this is turned on). During the years of production, the radio receiver EShS-3 and EShS-4 underwent at least 2 upgrades.