I have an EVO 400. During a very hot summer with the air conditioning broken, I turned off the amp then turned off the rest of the components.
By mistake, I thought that I had forgotten to turn off the amp and I turned it back on again. Instead of reheating the tubes, the amp went immediately into protective mode...with all red warning lights on all tubes lit up.
I immediately turned the amp off and waited 10 minutes for everything to cool down...the amp was ready to go. No issues.
So far haven't blown a tube in the 2 full years I've owned it.