HP Hewlett Packard 331A Distortion Analyzer Vintage Test Equipment, Ham Radio

Vintage Hewlett Packard HP 331A Distortion Analyzer. This unit measures approximately 16 1/2" wide, 13 1/4" deep, and 6" tall. The HP 331A is designed to measure total harmonic distortion and AC voltage with exceptional accuracy for its era, using a precision notch filter to remove the fundamental test tone and display only the distortion products. Ideal for vintage amplifier testing, audio restoration work, or adding authentic lab gear to a repair bench, the HP 331A remains respected for both performance and build quality. This unit appears to be missing most of its housing and powers on as shown. The exterior shows scuffs, scratches, residue, and wear from age and use. No further testing was performed and functionality is not guaranteed. Please see all photos for the exact condition and what is included.
This is free shipping to the Continental United States.

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