I have used Gold Lion KT 88 in my Quicksilver monos and they have been great. Reliable, sound good. I bought a matched quad a few years back and they have many , many hours on them. They are now spares but they had so many hours on them the silver getter flash was fading. Tested stronger than spec for "new" when I got them and they still are pretty tightly matched, still reading just shy of "new"
I have had GL KT 88, 77, 66 .... all reliable