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I don't have tube gear but all of my solid state stuff except for my music server get shut off when I am finished listening. However, I have a soft start master controller that brings all the components up slowly to eliminate surges. It also drops everything out if the line voltage goes too low or high. If anyone is interested I could post the schematic. It would not be optimum for tube equipment because the filament voltages would also rise slowly.

My new old Cary SLM-100 has two power switches.
The first just turns on filaments. Instructions say to wait 3 mins which I think is too long.
I usually wait about a minute to turn on the 2nd switch which activates the high voltage PS (B+)