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The subscriber loudspeaker "ETP" (0.25GD-III-2) has been produced since 1951 by the Leningrad artel "Electrotechpribor".
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AG was produced in three versions: 1st and 2nd versions (both 1951) are made in a wooden case with a metal grill on the front panel.
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The third version was produced since 1952, this version was in a plastic case.
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The Artel trademark can be seen on the volume control knobs and on the back of the loudspeakers.
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Only unlike the previous trademark, "LNG" was replaced by "LGR" and these letters were taken out of the rhombus.
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One of the buildings was used for the production of its AG "Leningradets" in 1952 by another Leningrad Artel "Radist".
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The cases are the same both in size and design, but the components are different.
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Any AG is designed to listen to one program transmitted over a wired radio network with a voltage in the 30 V line. The power consumed from the radio network is 0.25 W.
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The range of reproducible sound frequencies is 200 ... 5000 Hz.
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The dimensions of the first two AG variants are approximately 200x160x950 mm.
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Weight 2 kg.
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