Vintage Hewlett-Packard Model 330D Distortion Analyzer, manufactured in Palo Alto, California. A classic bench-top instrument used for measuring total harmonic distortion (THD), noise, and signal levels in both audio (AF) and RF circuits.
Features
Input level control (Min/Max)
Frequency dial with x1, x10, x100 multiplier
AF/RF mode selector
Meter function selector: Distortion, Set Level, Noise
Percentage and dB output scale
HP Decibels analog meter
Null/balance meter
Dimensions: 19" x 13" | Weight: ~29 lbs
Condition: Used/Surplus — sold as-is, untested condition. Ideal for collectors, vintage electronics enthusiasts, or lab restoration projects.
