I did NOT have the change in sound that I was looking for by adding Jensen Copper bypass caps to my Cary SLP-2002. Now, a year later, got the nerve up and installed MIT RTX Polystyrene Bypass caps. After burn-in, I am quite satisfied with the increased speed/dynamics/bandwidth/resolution/neutrality. All without the added brightness that so bothered me with the Jensens.
YMMV