I am using vac 70/70,s with 989,s and they perform very well.Have you listened to both output taps?Are the Quicksilvers plugged into the power plant?I tried one of the latest ps plants and it helped the cd player but created congestion when either of my phono stages or line stage was plugged in and the power amps into the ultimate outlet was a disaster.Several people that have posted here are using amps with less power than yours with Quads and are happy,Mike Sanders has been building amps for a while why not e mail him.
