One of the arguments against tube amps is that the tubes are fragile, but in my experience they tougher than you would expect. Yes they are glass, and if you threw one at the concrete it would (probably) break, but once they are in the amp they are safe.
I’ve dragged my tube amps all over the place and even dropped them without any damage to the tubes. One time I had a Twin Reverb fall over on it’s face so hard that the speaker was damaged, but the tubes were fine.
Tubes on amazon: https://amzn.to/2mH9qpz