Manley Steelhead Tube Rolling

The Steelhead is very, very fast and dynamic, so it would probably mate well with this amp.
Tube rolling is just fine for the Steelhead. Most manufactures don't use current production tubes because they are the best sounding. They will stock their products with what is currently available in new production and assume that the knowlegeable audiophile can provide his/her own tweaks. My steelhead sounds much better with NOS amperex 6dj8 and 6922. Current production sovtek 6922's kinna suck, though the older NOS ones are supposed to be better. You don't really need to change the buffer tubes.

I have also tried the GE five stars 5687 but haven't burned them in for a long time yet. They also sound pretty good in the Steelhead, I am a fan of the five stars in general.
So far, though, I like the Tung Sol 5687 D getter (flat side) a little better. The Tung Sol's have better slam and energy, the five stars are smoother but a little less drive. It would be a matter of taste between the two.

I listed some further impressions on another thread:

http://forum.audiogon.com/cgi-bin/fr.pl?htech&1107569647&openflup&8&4#8