Many KT-88 tubes are designed like the original MO Valves--the original Chinese Gold Dragon KT-88s were supposedly exact replicas. Haven't heard anything yet that sounds as good as the real thing or is as durable, though, even though the new tubes seem to spec out better. It's not just the design, it's also the materials, and I think that's where a lot of the modern tubes seem to fall short compared with the originals.
