All musical instruments can be defined by their unique spectrum of harmonic overtones. Harmonics are what enable you to distinguish between a viola and a clarinet playing the same note, e.g. A at 440hz.
Amplifiers running in any class, e.g. AB, will not have the same amounts and combination of second, third, fourth, etc. harmonic distortion.
Amplifiers running in any class, e.g. AB, will not have the same amounts and combination of second, third, fourth, etc. harmonic distortion.