I have finally decided......

FWIW, that's what I do, unless I'm out of town or know I won't be using the system for a while. And my equipment, Jadis, is much more "on the edge" than ARC, in terms of whether anything can go wrong. I am trying to convince myself that the turn on/turn off cycling of the tubes wears them out faster than leaving them on all the time, but I think that argument is the same as leaving your car running all the time instead of turning it off and starting it up when you use it because you use more gas starting the car than when it's idling! Nothing has gone wrong yet, but my fear with this practice is that something might go wrong enough to cause an electrical fire while I'm not there; don't know if that's reasonable or not. Any more informed opinions?

there are two points there which you will have to choose:

1. tube life will be much shorter and i wouldn't recommend to do it with expencive NOS tubes. it wouldn't heart small signal tubes to be switched off for the night and than after you come home run to heat-up for just 10min.

2. you will have some benefits on running them on since one hour worm-up time is more beneficial to the sonic performance than 10 min yet id depends on the tubes and its age as well.

and finally less-likely your electricity bill will grow from small signal tubes.

Russ....your last statement scared me to death!! But I think I'll live with them "on".

Marak....do you mean "tube life will be much shorter" turning then equipment on-off?? or just leaving them ....on?? Sorry, I didn't understand.