Tube Amps With Good Bass Qualities

@mijosyn,
From what I read, I did not find Ralph extolling his amps, but only providing an overview about what happens and why.

Even with the smiley emoji, I think it not fair. 
Especially so when there are other dealers on Audiogon who would be much more blatant.
My 2+ cents...
bob

Bob, the smiley face was to indicate that I was kidding. I was simply responding to his comment about not wanting to mention other manufacturers who he seemed to think were inadequate to some degree. Ralph does not need to make any enemy's in this business and remaining politically appropriate is important especially where humans are concerned. IMHO they are vicious animals. Lighten up!

+1 On Primaluna Especially the HP (they also have a sub out tap)

Found Atmosphere's response fascinating. 

If I understand correctly that you have Klipsch Heresy’s w/ a frequency response of 58-20,000 Hz..then a sub couldn't hurt. 

I run a small sub (many to find used) and wow. With a PL too under 5K. 

miostyn  I got lost with the subwoofer reference and tube amps.  The OP made no reference to that.  I've owned several subwoofers, mostly JL and of course all are solid state amplifier driven.  To your point of driving subs with tube amps you are correct.  But who does that?

The OP query references bass qualities of vacuum tube vs SS.  I own Sugden Class A solid state and Manley Mahi Mahi mono blocks.  The Sugden may have an edge with quickness, but the Manley mono blocks are musically more palpable and are not to be messed with.

To the OP, try the Mahi Mahi or the Snappers and be amazed.

From the perspective of someone who listens to a lot of electronica,  i have yet to hear a valve amp that can bring the fear factor in the sub bass. 
To my ears valves sound superior on acoustic bass instruments,  one tends to hear the leading edge with more definition, but the weight of the sustain doesn't match what a solid state leviathon can do. If you want your domestic system to do an impersonation of a superior stadium or club pa, ime you need solid state amps driving the subwoofers
Having said that, some of the most pumping reggae sound systems use(d) home made valve bass amps, and their bass was a force of naturr, redefining what bass meant, but undoubtedly those run primarily at higher frequencies than the sub bass in deep house, drum and bass etc