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could a different power cord cure sibilance?

recently upgraded my phono pre to an AR PH3SE modded by Great Northern. In a different league from its predecessor, a stock EAR 834P, but now there is too much sibilance on some vocals (e.g., on Thriller or MFSL Amercian Beauty). Definitely caused by the phono pre. I understand that the tubes used could contribute to excess sibilance, have tried various types, and will try others. Could the power cord affect this too? It's about the only other variable. Currently using Signal Cable Sivler Resolution pc. Recommendations welcome.
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cruz123
586 posts
 
No, IMHO. Why not hook up the stock cord or swap between another component to see if there's any difference?
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daverz
487 posts
 
I think a much simpler explanation is that the capacitive and/or resistive loading of the ARC needs to be adjusted for your cart. I suggest posting on the analog board for advice, giving your cart model and the current settings on the ARC.
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