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Subscriber loudspeaker "Tulyak" produced since 1948 Tula plant "Octava". Subscriber loudspeaker "Tulyak" was developed at the end of 1947 and is designed to work in a radio broadcasting network with a voltage of 30 volts. It is distinguished by a loudspeaker, where the entire mechanical and electrical part is located inside the diffuser. The loudspeaker reproduces an audio frequency band of 150 ... 4500 Hz with an electrical power input of 100 mW. Since April 1949, the plant produced a practically similar loudspeaker with the name "Tula". Some parties of subscriber loudspeakers of this and subsequent releases were called "Octave" or were without a name.