I know it's really expensive, but the Tara Labs GX phono cable is just fantastic! Two friends with Graham arms (and great systems) were so thrilled with theirs that I bought a used one here on Audiogon. It has made more difference than any cable change I have tried. Probably more like changing to a great cartride. It's hard to justify the price,but it will be the last time you buy a phono cable.
