Do I NEVER shut it off…?

Ah well, you can lead a horse to water, but you can’t make him drink it.

"Not this science" responds and refers to "Their are many scientists that disagree with the accepted science." (invalid's post)

By all means, don’t take my word for it. If either of you can read a scientific discussion, ask the question on a science board. I’m retired, and don’t have the patience. And when last I looked, this was an audio forum. Yet again, please leave your politics at home.

I shut my tube stuff down. Everything else runs forever, especially the computer, they hate being power cycled. ;)

I leave my tube preamp on all the time along with my big solid state class a amp.

@invalid,  that’s really invalid to leave tube amplifiers overnight on. 
It’s fire hazard 

It's a tube preamp, doesn't run hot you can touch the tubes. I've had the same tubes in it for over 3 years.