I went from Sovteks KT-88, came with my recently purchased Quicksilver V-4, to Genalex Gold Lion. This switch had the same sonic effects as when I replaced the EH 6922 with Amperex 6922 U.S. PQ in my CDP, from thin and airy to full, detailed and dynamic!! I bought matched Quads from the TubeDepot they were great to deal with and fast (no affiliation) so far no problems!!