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Distortion can be caused by many things, and varying levels.

Two of the most common are;-

Clipping.

This is when the amplifier has reached maximum or minimum amplification and causes the wave form, to be flat top and bottom. It squares the waveform and sounds rough. Usually due to the input signal being too high.

Harmonic.

This is a form of feedback, where the input is receiving signal from the output. Sometimes the amplifier 'rings' at a harmonic of the input and is re-amplified giving a tinny, squeaky, sound.

Caused by bad screening or component layout.

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