Antique Electronics and Vintage Solid State

Reproduction battery for General Radio 1232-A Tuned Amplifier and Null Detector

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The General Radio 1232-A Tuned Amplifier and Null Detector was primarily intended for use as a detector for bridges. It is a low-noise amplifier and a filter that can be tuned from 20 Hz to 20 kHz, or set to 50 kHz, 100 kHz, or a flat frequency response.

60 Hz Filter for the HP 6920B

The HP 6920B Meter Calibrator uses the waveform of the input AC power to derive the waveform of its calibrated AC output. The HP 6920B controls the average value of the output AC. Consequently, if there is much distortion on the power line, there will be a difference between the RMS and average value of the meter calibrator AC output. 

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