Ugh, I only have two tubes in my amp and Im over it. Preamp tubes went in my head just as I finished my last gig. It gets beaten up a bit but its in a road case, but I can't be bothered with it anymore. I think what I need is a sturdy SS amp for shitty gigs and practice, and nice low power toob amp for home and recording.
I've been through a few tube amps and the sound is divine when they are functioning correctly. Lugging them around gets old and I had a TE Quatravalve blow a filter cap and catch on fire during a gig...that kinda sucked. As much as I like them I'm not going back to them because modern amps are versatile, lighter, and sound great. I keep flirting with buying the new ampeg 20 watt portaflex head but just can't seem to justify it. Also, for those who have never been on the higher-end side of solid state it sound pretty awesome as well.
Tubes have a remarkable life. In the studio we had about eight tube guitar amps. Not replaced any tube in 15 years time.
The thing with tubes is: they do not like to travel. If you allow them to cool down completely before moving the amp they will last years. For this reason I use my solid state amps at festivals and other multi band venues.