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Subscriber loudspeaker "D-3" presumably since 1938 produced the Moscow Engineering Plant. The subscriber loudspeaker was called "D-3" by the type of speaker, had high frequency characteristics, 30 ... 7000 Hz and an output power of 0.35 to 0.8 watts. Here is how the D-3 subscriber speaker Sergey Nenashev describes. The case of a loudspeaker is rectangular in shape, measuring 310x360x150 mm. The design is unusual in that it consists of a box with a removable top cover, through which the installation of the element base was carried out. The lower part of the body (bottom) and the upper plate of the cover are made of five-layer plywood, but the main part of the body is of three-layer plywood. The body parts are glued together and are covered in black dermatin. Inside the box is a speaker, with a transformer fixed on it and two pairs of petals for mechanical volume switching, depending on the size of the room in which it was installed. On the front side of the case - one stylized hole with a radio fabric that protects the speaker. Behind - two elongated oval. At the bottom of the back of the case there is a nameplate. The same nameplate is on the speaker, like the stamp "D-3". Judging by the abbreviation of the People"™s Commissariat (NKM USSR), which existed from August 22, 1937 to January 22, 1939, the apparatus was made before the war precisely in these years. These data indicate that the copy on the penultimate photo is the version of the D-3 subscriber loudspeaker, manufactured by the Moscow Electrozavod named after Kuibyshev, located at the address: Moscow, Elektrozavodskaya ul., 21, which in different years was under the jurisdiction of various people's commissariats and therefore had different names.