black koetsu sounds weird


I have an old Black Koestu on a Linn ITOK arm on an Oracle Delphi table. For phono stage I use the rega fono. I push this through a Meitner pre amp and amp. I condition power with PS audio quintette and a dedicated circuit. Some days its OK and some days just downright miserable and thin. Any thoughts anyone?
128x128dozerstance
If some days it is sounding ok , it may have magnetic particle buildup fouling the movement of the cantilever . A friend with a steady hand can sometimes remove this with a piece of bluetac on a matchstick under a microscope .
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