If you want a semi helpful comment beside search, here is my humble opinion.
If you are only using Solid State as indicated you can leave them on idle. Idle power consumption is generally equivalent to keeping a light bulb going. There is no good evidence to argue that keeping them warmed up hurts them.
I have an all tube system for my main and second systems. In this case leaving them cooking is not such a hot idea. Tube life is related to hours used and you will burn them out more quickly leaving them on 24/7I was told this on a forum posted by a very knowledgable tube person. I was told turn them on for as long as you intend to keep listening. After you have had your fill with turn them off.
The only valid arguement to keep them on- is if you are prone to schizophrenic insecurity and are turning them on and off all day. The initial energy surge is indeed a way to shorten tube life.
I really only care because even my current production tubes aren't cheap. My old stock tubes have become insanely expensive and I do like many of them.
