Ditto the Bunkster -> SED 6550C is my fav. It is a nice tube for my cary SLI-80, single pair p/p. They are also used in AR and VTL power amps to good effect
Groove tubes E34Ls is also a nice tube in my Snapper. If it would sound good anywhere else, I dunno.
I heard KT88 only once (that I remember) in a Cayin A88 playing Quad 2805. Oh boy that was awesome. How much the tubes had to do with it I dunno.
Rich