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The subscriber loudspeaker SMZ (Saratov) 05-GD-1 since 1945 has been producing the Saratov Machine-Building Plant (Saratov Electroute Production Association. SEPO). Below is the subscriber loudspeaker information provided by Sergey Nenashev (VINT) from Moscow. The SMZ 0.5-GD-1 electrodynamic loudspeaker was developed in 1940 for production at the Saratov engineering plant under construction at the USSR People's Commissariat for Aviation Industry, which was planned to be launched at the end of 1941. The war prevented it, so it was only produced from 1945 to 1951, when the SMZ was focused on the production of Saratov refrigerators. AH had a bulky plywood case (320x330x150 mm) in khaki color, but it differed in the novelty of the element base. The speaker had a molded case (basket), a collapsible design (which had no analogues in the USSR) with frequency ranges of 150 ... 5000 Hz. In AG, a smooth volume control was installed, a transformer of particular design with the ability to connect to a broadcasting network with a voltage of 15 or 30 volts, which was easy to do with screw terminals. Due to their use, AG assembly was carried out practically without soldering. The volume control knob was located on the front panel of the AH and was marked as "SMZ" by the manufacturer. The official name "Saratov" AG did not have, therefore, among the population and collectors, the two names "SMZ" or "Saratov" stuck to it. The quality of the element base and sound AG, at that time, had no equal in the USSR.