So i have a few questions and im having a hard time finding my way through to the answers. So what im wondering is, will having a wall voltage of only 100v be problematic(im running a 100w Marshall DSL100HR and about 10 pedals). If so why and how do others get around this, for example how do i get my voltage more consistent? I live in an old house in an old neighborhood but i thought that the city regulated the amount of power we see at our outlets. Its summer and ive heard in some areas they bump up the voltage to make up for all the people running their AC's etc.? Forgive me if im pathetically wrong here but wouldnt more people using more electronics just lower current not voltage? And ive looked into getting a regular Variac (one not rated for audio applications) but what i gather is that when the voltage swings at the outlet it will also swing at the Variac. Basically the Variac can only control the voltage its allotted by the outlet. So what kind of regulator would i need to get a consistent 120v or at least consistently closer to 120v. I know older amps were designed around 110v and then later 117v (fender) with power fluctuations of about 10% in mind. But even with a modern amp designed to run at 120v i feel like 20v is pushing it. Last question, when im biasing my amp and getting plate current isnt that going to be directly affected by the wall voltage? And if yes would that mean that my ideal bias is constantly shifting? Ive had power tubes going out pretty regularly(about every 9 months or less) and im wondering if thats cause im biasing when the voltage is low and then later when its high and im using the amp my bias that was set to a little over average is now too hot? Any help appreciated, i dont like to be in the dark about these things. Ill feel much better when i have a better understanding all this.