Great thread Jman-- and so CIVIL. Hi Trelja and Greysquirrel. As a (sometimes) tube amp wannabe, I'm afraid I have nothing to contribute-- except questions. I have a SF Line 2 pre-amp and have done a little tube rolling with it, and I'm considering a SF Power 2 amp (I'm not really set up for mono-blocs). Is the amp design or the tube type more important, re: the comment Greysquirrel made on amp design? I read the Stph review of the Power 2, but don't remember what tube type is standard, just that it is quite neutral as opposed to tubey, but I've assumed that this can be changed with a simple tube change? Any comments on the Power 2 and its tubes? I especially appreciate peoples assessments of bass quality of the various tube types because I have a big SS amp with excellent bass (McCormack DNA-2DX). Hope this post isn't stepping on your thread. Thanks. Craig.