ZG-14 (Generator zvukovoj chastoty) 1961
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The sound generator "3G-14" (G3-18) was produced since 1961. The audio generator "ZG-14" is intended for testing and tuning of the amplifying radio equipment. Diavazon frequency generator 20 ... 20000 Hz. More information about the device in the bottom of the documentation.
Documentation:
Information from collection of Valery Khartchenko