1951 saw the creation of a 25-watt radial moving-coil loudspeaker, for that year's Agricultural Exhibition in Moscow. From around 1954, the plant began to modernise and focus exclusively on telephone and microphone production. In 1957, Oktava small telephones and moving coil radial loudspeakers were displayed in the Russian section at the 1958 exhibition in Brussels. In 1961 Oktava introduced the D2 miniature telephone and began supplying dynamic microphones to the Kremlin. The plant also commenced a second round of modernisation and began producing electro-acoustic measuring instruments to test microphones and telephones.