The type of diamond needle you use does leave traces in the groove of the lp producing noise . Depending on the type they ride on different levels of the groove .
Be it conical , eliptical or line contact . Conical because of its shape and size tend to track the groove on its upper part of the groove . Eliptical goes deeper tracking the groove in a lower level of the groove and because of this tracks information which the conical shape misses .
Line contact because of its shape is capable of tracing very deep in the groove and because of its shape can pickup information on the upper levels of the groove walls . With all three levels noise developes over time . Changing the type of needle used as from conical to eliptical minimizes the noise because you will be tracing a different level .
Be it conical , eliptical or line contact . Conical because of its shape and size tend to track the groove on its upper part of the groove . Eliptical goes deeper tracking the groove in a lower level of the groove and because of this tracks information which the conical shape misses .
Line contact because of its shape is capable of tracing very deep in the groove and because of its shape can pickup information on the upper levels of the groove walls . With all three levels noise developes over time . Changing the type of needle used as from conical to eliptical minimizes the noise because you will be tracing a different level .