NEEDLE-SCRATCH
As the pickup stylus traces the groove, the fine particles in the material of the disc cause the stylus to make small irregular movements. The voltage setup by these movement is amplified and is heard as needle scratch. The noise lies mainly between 2 and 10 kHz.
Fig. 9.13 Needle wear
Needle scratch will be particularly bad when the diameter of the needle is too small for the groove. For good reproduction the stylus should rest on the two sides of the groove. If it rests right in the trough, it may ride up the walls, thus giving excessive scratch and additional distortion. If it rests on top of the groove only, it cannot ...
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