for a tube amp primaluna's bass is excellent (my primaluna is an hp model, 4 power tubes per side, not quite so sure about the lesser ones with 2 tubes per side) ... i think only audio research is better at bass solidity, and then only slightly... they won't compare to what an ss amp does in that regard.
also on tube primaluna tube amp you need to try the various output taps to find which gives you the best bass and transient capability
raven seems to have a small loyal following but i have never tried one
also on tube primaluna tube amp you need to try the various output taps to find which gives you the best bass and transient capability
raven seems to have a small loyal following but i have never tried one