Replacing anywhere from 16-24 stock resistors in the signal paths of each of my ARC REF 40 preamp and REF 10 Phono with Vishay Z-foil/TX2575s. Mucho improvement, but trying to figure out the right number and positions for best results. Still fiddling with it.
Also will be playing with a pair of TUBULUS Argentus DB-25 cables on my Pass Labs XVR-1-3 way crossover. This unit was modified some time ago during a 2 year period with ~130 parts replacements in 30 different listening trials. I’m never doing that again thank God...!