Uh-oh. Counterpoint time.
I've owned ONE fully tube device, an Ampeg SVP-Pro. It can work fine, and when it does, it sounds lovely. It has never made it through a whole gig, no matter how short.
It just cuts out, and won't come back. It's been looked at 3 times, and no-one can fix it.
YES! Of course it's out of warranty.
And it always brings its buddy, captain 50hz hum to the party.
It has had a second full set of valves, supposedly "good" ones, yet still it happens.
Conversely, my Trace Elliot is now 10 years old, and has suffered nought but a microphonic pre-amp valve (!) and a loose connection that I found and hardwired.
My "little" 80w 1x12 practice amp is now over 20 years old and just keeps on delivering excellent tone against a silent background. It's Solid State I'm afraid.
I'd love a quiet, modern sounding, all-valve front-end, but I really can't be convinced to part with the money based on my experiences of poor reliability.
All of my problems have been pre-amps using 12AX7s (the Ampeg uses an AU7 for its OD circuit), so I daren't ever use anything that uses valves for power amplification!