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The radio receiver network lamp "Symphony" in 1955 was developed by the Riga State Electrotechnical Plant VEF. By the beginning of 1956, the VEF plant had developed a number of receivers and radiometers on finger lamps of various designs and parameters. Some of the units and the chassis of these devices were unified. All devices had a key switch, a rotatable internal magnetic antenna, and an internal dipole, if the VHF range is provided. Receivers and class III radiology should have 2 speakers each, 2 class and higher - four. The names of the new devices are represented by precious stones: Diamond, Amethyst, Aquamarine, Crystal, Ruby, Sapphire, Topaz, Amber. There was a river series: Amur, Angara, Terek, Dvina and the musical series: Concert, Melody, Symphony and others. Some of the samples were transferred to production at other plants of the USSR (mostly new, where there were no strong design teams), some were made only by an experimental batch. The newspaper Vefietis (VEFovets) at the end of 1955 reported that the task of the Ministry of Radio Engineering Industry of the USSR about the development of 15 models of radio equipment and the manufacture of their prototypes by designers and production workers of the VEF was successfully completed. Most of the devices developed were shown at the 1958 World Exhibition in Brussels and were awarded prizes. Many developments were shown the following year at an exhibition in New York (1959). Radio Symphony second class was a prototype, made in a single copy.