I know Rob's love for tube amps and in fact I share it!
But:
A lot of times I took my Hiwatt with me onstage. In the end it had to be turned down otherwise it was too loud for the small venues we play in. So I played a very big and heavy tube amp on a very low volume... Of course I could go for a 50 or 100 Watt tube amp, but I decided to have a smaller amp for smaller gigs. I know It doesn't sound that good, but good enough and I let the sound engineer do his job by creating a good PA sound.