ZG-2A (Zvukovoj generator) 1948
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The sound generator "ZG-2A" was produced presumably since 1948. The sound generator "ЗГ-2А" is intended for testing and tuning of household radio equipment. The range of generated frequencies from 0 to 20,000 Hz is divided into 8 sub-bands. The low-frequency signal from 0 to 20 KHz is the difference frequency from the beats of the frequencies of two RF generators, one reference and one with a smooth frequency tuning.
Documentation:
Information from collection of Valery Khartchenko