This circuit was obtained from a document of the 60's and consists of a commercial audio signal generator using 4 valves. Two are double and one is rectifier, being part of the power supply. The circuit generates signals in three bands with a maximum limit of 100 kHz. The output is made by a low impedance transformer. The signals are sinusoidal and the source transformer provides between 125 and 175 of secondary with typically 50 to 80 mA. The tubes are the critical components of the design.
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