I have settled on the Shuguang KT88-T tubes in my KT88 tube amp (Don Sachs ~74 watts). I also like the Shuguang Treasure KT88-Z tubes but they are a bit muddled on the top end compared to the -T tubes. These are noticeably better than any PSVANE or Gold Lion tubes I tried. I am using a tube preamp as well.