Subscriber loudspeaker "D-3" presumably since 1938 produced the Moscow Engineering Plant.
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The subscriber loudspeaker was named "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.
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Here is how the D-3 subscriber speaker Sergey Nenashev describes.
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The loudspeaker case is rectangular in shape, measuring 310x360x150 mm.
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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.
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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.
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The body parts are glued together and are covered in black dermatin.
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Inside the box there 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.
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On the front side of the case - one stylized hole with a radio fabric that protects the speaker.
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Behind - two elongated oval.
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At the bottom of the back of the case there is a nameplate.
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The same nameplate is on the speaker, like the stamp "D-3".
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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.
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These data indicate that the copy in the penultimate photo is the version of the D-3 subscriber loudspeaker, manufactured by the Moscow Electrozavod named after
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Kuibyshev, located at the address: Moscow, Elektrozavodskaya ul., D.21, which in different years was under the jurisdiction of various people's commissariats and therefore had different names.
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