Anyone try KT88 vs KT68?

Primaluna can use either and I was curious as to whether anyone has experience with both. Is there any consensus as to a general difference in the character of these tubes?


Sorry - make that KT-88 vs KT66
In my very limited experience, the two sound quite different. The KT88 amps I've heard had terrific detail and drive. If I were a rocker I would want them. The KT66 tubes were IMVHO perfectly fine for rock but for tone and warmth, delicacy and finesse they were the ones to beat.