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.
I listen to a lot of electronia too. I started in 1972 when I heard Tangerine Dream on the local radio station! Since then ambient and electronia has always been an important part of my LP collection. Infinity Project put out an amazing LP called 'Mystical Experiences' that has some nice bass tracks, the second LP by Global Communication is great in that department and of course the usual suspects like Massive Attack, Future Sound of London, Forest Swords and so on- I'm always in search of the next best bass drop (but with some substance in the music, not just 'unce unce unce unce' for an entire record side...
My speakers go to 20 Hz no worries- and I've yet to hear a solid state amp that makes the bass as well. So much has to do with the amplifier/speaker interface though as I pointed out above. If you want a tube amp to play bass properly, then it should not be put at a disadvantage! A lot of people seem to want to make a tube amp fall flat on its face by subjecting it to a load for which it was never intended. This IMO is simply a waste of time and money- you want a tube amp to play bass then make sure you've done everything to allow it to do so and you will be rewarded.