I used to WATCH the music on the ‘scope… (Jun, 1958) Popular Electronics.
Every time I bought a record. I used to set up the calibrated microphone. connect the oscilloscope. start the music with hated breath, and keep my eyes glued to the screen. If anything on the ‘scope pattern looked suspicious (something always did), I would start checking tubes, voltages and crossover frequencies, and examine the record under a microscope.
The good ole’ days.
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