Replying to the original post: I am also using a tube poweramp, and yesterday I auditioned for a metal band here in Brussels. I had dialed in 4 patches, 2 Ueber, one Das Metal and one SLO and one of the Uebers killed the other two. Gotta say that I am normally not a metal player, more rock, so it was new territorry for me, also the cab in the space there was a Marshall with G12T75s, so it took some dialing in.
What I found in using the ueber with a tube rig is that you gotta keep the master just below noon, there is a hike in bass content/fullness when Master goes beyond that. Keep it lower and put sag at 9 o'clock, keeping warmth below 2, that brings you closer. I had presence around 3 o'clock too, to add some fizz. It was a great metal tone with low output pickups (McCarty).
