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bought a well reviewed replacement stylus for my Shure V-15T3 phono cartridge..90% of the time its outstanding....BUT , the letter "S" in vocals is "spitty" sounding.

I've double checked alignment, overhang ...adjusted VTF between 1.2 and 1.9 grams ....have fiddled with preamp settings ... no joy

I've never had this problem on any other cart ... the old original stylus doesnt do this .... am I missing something ?