Leave tube amps always on?

aj,

Whether turning a tube on & off or leaving it on, a tube doesn’t consume any more power than they are designed to consume (as long as your amp is functioning properly and biased correctly). But the initial temp change from cold to hot when powering on is what is especially stressful on tubes especially power tubes.

Your LTA amp is designed to be less stressful on tubes thus longer life so I wouldn’t be as concerned with your amps. I would treat it like a preamp. Turn it off when you leave the house or go to sleep. Other times use discretion.

PS. EDIT: What Larryi2 said above while I was typing.

aj,

The arguement for leaving tubes on is that they sound better fully warmed up not that the tubes consume excess power when you turn them on. Frequent on off tends to reduce tube life especially power output tubes. 

You should perform some experiments by listening to your LTA amp from a cold start vs fully warmed up. Can you hear a difference? What is the minimal acceptable warm up time? Please report back what you find.