All seriousness aside, I switched to lower-powered tube amps exclusively 13 years ago when I got a Bassman 100T (100/25 watts switchable) and 7 years ago added an Ampeg PF-50T (50 watts). Originally playing cover rock, now for 10 years barrel-house blues. I specifically went lower powered so the power tubes can be pushed just shy of saturation and breakup at reasonable volumes. I say the magic of an all-tube amp is 20% or less from the preamp tubes, 80% and more is from the power tubes. The power amp section of the tube amp is where you get the "sag", or self compression, that tube lovers dig. In a well designed tube amp the sag can rival a studio compressor in quality but reacts much more organically than a hardware compressor. Forget about a pedal compressor even approaching it. Aside from the sag, the amount of harmonics the power tubes start generating as they approach breakup is glorious. And again in a well designed tube amp you get a very satisfying bark, grunt or growl (depending on the amp) when it does breakup, not a raggedy f*rt as from a solid state amp. In order to get to this point with a 300 watt SVT or Super Bassman, you'll be melting faces if you're in anything but a very large room, hopefully it'll be outdoors. Both my tube amps have post-output transformer DI's, which is post-power tubes with cab modeling, so you get all the power tube glory to FOH, or recording interface, without having to mic the cab. Tube overdrive/distortion/preamp pedals, or tube preamps in hybrid amps, do not at all deliver the sound of an all-tube amp. Maybe a good sound and a sound you like, but it does not have the properties of the tube power amp. Preamp tubes can exhibit their own amount of self-compression, but In the power section it's the result of other factors outside the power tubes and it's the interplay of those that make it much more organic and amorphous.
A few weeks ago Mesa released the new Subway BD-800, with a tube preamp and digital modeling in the class D solid state amp that emulates their classic 400+ tube amp. I liked what I read and got one of these. Although it'll never replace my tube rigs, it acts more like a tube amp than any hybrid I've ever played. I'll more than happily use it on gigs with difficult load in/out or gigs requiring lots of stage volume, the BD-800 being 800 watts. Really never thought I'd play solid state again, but I like this Mesa amp very much.