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The sound generator "GZ-2" was produced presumably since 1954. The same generator, but under the name "ZG-10" was produced presumably since 1958. The sound frequency generator "GZ-2" is intended for use as a source of sinusoidal electrical oscillations of sound (low) frequency. The device is designed for use in laboratory conditions and repair shops. The range of all generated frequencies is 20 ... 20000 Hz, divided into three sub-bands: 20 ... 200; 200 ... 2000 and 2000 ... 20,000 Hz. Frequency setting accuracy ± 2%. Frequency drift after 30 min. preheating for the first hour of work not more than ± 0.4%; over the next seven hours of operation, the additional frequency drift is no more than ± 0.4%. Normal output power 0.5 watts maximum 5 watts. The maximum output voltage at the matched load is 150 V. The output voltage is varied smoothly, and also in 1 dB steps from 0 to 110 dB using two dividers: the first through 10 dB from 0 to 100 dB, the second through 1 dB from 0 to 10 dB. The output impedance of the device is designed for the agreed load 50; 200; 600 and 5000 ohms. Nonlinear distortion factor: at normal output power below 0.7%; at maximum output power below 1.5%; with a maximum output power of 5000 ohms below 2%. Irregularity of the frequency response relative to the readings at a frequency of 400 Hz: at maximum output power and at all loads at frequencies from 50 to 10,000 Hz, no more than ± 1 dB, at frequencies from 20 to 20,000 Hz, no more than 3.5 dB; with a normal output power at a matched load of 600 ohms, no more than ± 0.5 dB at frequencies from 50 to 10,000 Hz, no more than ± 1.5 dB at frequencies from 20 to 20,000 Hz. The graduation error of the indicator scale at a frequency of 1000 Hz at voltage up to 60 V does not exceed ± 5%. Power supply of the device from the AC network with a frequency of 50 Hz, voltage 127 or 220 V. Power consumption is not more than 150 VA. The dimensions of the device - 598x357x293 mm. Its weight is 35 kg.