Which 6sn7 tubes for Rogue Magnum 99

The NOS Sylvania GTA and GTB tubes that I had in my system were indeed smooth and detailed as Samzx12 described and are absolutely a great tube. I think the sibilance part is going to be system (and preference) dependent. In my system, it was too much for me, but as I mentioned above, another guy in the shop loved them as they transmitted more air and detail through his system than ever before.

Anyone tried Sophia's and how do they compare to Sylvnania Bad Boys?

THX

Here's a list of what are considered the best of the 6SN7 family, and what you can expect, with regards their presentation: (http://www.tubeseller.com/ratings.php)