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"I am delighted to have these old 78's from my childhood now preserved in listenable form on a modern sound medium. I would not have thought it possible to do that at such an affordable price! Thanks too for the "preservation" copies. I am very satisfied with your work, and I am especially impressed with the promptness of your service. "

Distortion, harmonic

The appearance of harmonics of the applied input signal, as measured at the output of an electronic component.