Since I'm aware that this behavior can really adversely affect tube gear I installed an Intermatic Panel Guard whole house surge protector and an APC G50 power filter that is equipped with a variable delay turn on/shut off feature.
I'm able to set this delay anywhere between 4 and 255 seconds. My question is - what is a safe delay time to use for my ST120 with KT120's? At this time I've dialed it in at 60 seconds. Is that about right or should I go for more delay time?
Otherwise, our power provider does pretty well. So far the input voltage runs between 120 and 122 V and I've yet to experience any brown-outs. But the season has just started.