Do you keep your amps and preamps on all the time

Sean,
I'd want to add that you've got to make sure that such high-bias amp has plenty enough heatsink area arround transistors. If it's not the case the heat will always accelerate and run to fry not only egg but stake as well.
Some of manufacturers does not realize how to calculate the power dissipated on heat and do not provide enogh of heatsink area.

I agree 100% with Sean and follow the same procedures, Although I must admit I am lax when it comes to addressing the weather factor other than to have appropriate surge protection.

Yes, I do keep my amps and preamps on all the time. My gear doesn't run that hot. Common sense applies. I turn them off when changing cables, long absences, and stormy weather.

I agree with what you have to say Marakanetz. Even with what appears to be a massive amount of "fins", some of these amps are still lacking the proper amount of heatsinking due to the number of output devices and / or bias levels being used. As such, one should NOT take ventilation for granted and that is why i stressed the need for a lot of open area around devices that run hot. It is not uncommon for a high bias design to idle at a temperature between 110* and 150*, give or take. If the amp is running at the edge or above this temperature range, you either need more room above and around it or you should check into methods of low noise assisted cooling.

I've got a "high tech" temperature probe coming and i intend to do some testing with it. I think that the results may be pretty interesting to say the least. Sean
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Yes, I have solid-state and therefore do not have to worry about tube wear.