Manly Steelhead - any downside??

Just found this thread. Have had my Steelhead since '07. But just hearing how great it really is! Always had to run it through My Spectral preamp to drive Spectral amps. Am now letting go of Spectral. Using Steelhead to drive a pair of Forte' model 7 monos. WOW! Not enough power to drive my Avalons; Hope to try a pair of Pass 160.8s soon. There is a lot of tube info in this thread that I will try to sort through but I would appreciate if someone would spell out the tubes to really get and phone# to source them? Thanks

I have paired my Manley Steelhead driving a pair of Pass 160.8s to my Avalons. After (1) week; my impressions are: Great pairing! Well balanced top to bottom, midrange to die for, superb imaging, DEAD QUIET!!!!  Bass control is the best and feel no need for a subwoofer. My room is pressurized at low, med, HIGH volumes. Missing that last bit of palpable imaging and air that tube amps could bring but will keep Dead Quiet and bass control !! Will be ordering some Siemens, Amperex, Tung Sol to do my (1st) tube rolling. I do not miss the Hyper Detail of my Spectral system. All the details are still there; Just more natural. No Fatigue!! Best equipment change that I have made in years. Even 26yr old JVC, CD player sounds great through the (1) line input - Only if I leave it on 24/7. Works for me though. Any Steelhead owners that have rolled tubes ; I am open and would appreciate all advice. Thanks