Regarding tube amp care, I've used a 1960 Fender Deluxe tube guitar amp for maybe 50 years with varying degrees of on and offness and it works perfectly. Changed the tubes a few times over the years...but still. Also used dozens of other tube amps that were dragged everywhere for decades, dropped from loading ramps (thank you Anvil case), and otherwise abused...almost no issues. I have "soft start" features in my hifi rig in the power conditioner, preamp, and tube power amp, which I think provides all the mollycoddling and pampering the damn things deserve. Off when I'm not around, on when I am. I suggest people turn things off when not around just to keep from being wasteful boneheads or, if you do subscribe to the "leave it on" school of thought, don't admit it.
