The subscriber loudspeaker "Riga" from 1946 to 1966 produced the Riga Electromechanical Plant and the Daugavpils prison OTs 78/3.
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The subscriber loudspeaker "Riga" was produced in various design options.
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The cases were made of wood and carbolite.
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The loudspeaker at first was one piece with the chassis, where the transformer and the loudness rheostat were fixed, later the loudspeaker was used as a separate one, and a conventional angular potentiometer was installed instead of the rheostat.
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The type of AG also varied from 0.15GD-III-3 to 0.25GD-III-1.
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The name "Riga" was invariably, though not very noticeable.
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The subscriber loudspeaker "Riga" is intended for listening to programs transmitted over wired radio broadcasting networks with a voltage of 30 volts.
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The range of sound frequencies reproduced by the loudspeaker was different in different models, from 120 ... 200, to 4000 ... 5000 Hz.
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Of course, each new release of the loudspeaker must be considered a separate one, but to understand everything thoroughly with all the paucity of information is quite problematic.
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