Mmmm, valve vs solid state. As a quick reference, check out your favourite players on youtube, spot how many use valve/solid state amps,,,,question answered, 90% use solid state, usually Eden, GK, Ashdown,Aguilar, why?, more control, more tones, better reliability, lighter, cheaper. Tried an SVT rig,a Mesa Boogie, Trace Elliot, Fender,Roland and Peavey valve rigs side by side with an EBS FAfner rig, thanks to Gaz at PMT Birmingham. After two hours of side by side testing with all these i walked away with the EBS rig.
I believe the valve issue with bass players, along with the Fender basses is only a matter of nostalgia and name. Bass equipment has moved on incredibly far compared to guitar, don't forget, at one time there was only tube amps.
Conclusion, valve amps for guitar, thats what they were designed for
Solid state for bass, thats what [b][i]they[/i][/b] were designed for.
My apologies to all bass valve users, its your choice, my choice after 40 years of trying everything that has been available over this time is solid state.
RESPECT