JJ KT77 Tubes Vs Tung Sol 6550s

Re the JJ KT77s, these are excellent-sounding tubes, better than some of the Mullard EL34s I have, but not quite as musical as my best ones. Certtainly a bargain at the price, although I understand that their quality control isn't stellar (my pair is fine). Dave

Dave,
What tubes that you have sound better?

Eagleman, my best sounding pair comprises two old Mullards, one an Xf1 code and the other an Xf2. The KT77s hold up well in comparison, though, especially considering the price difference ($36/pr. vs. approximately $225). Dave