I am looking very very hard at entering the world of tubes and kits both by building Bob Latinos M-125 monoblocks. About ready to start selling some gear to fund this endeavor. In all my reading one thing that is very clear is that these amps can not be supplied by more than 122 volts or bad things happen. I have been measuring my wall voltage and it typically fluctuates from 122 to 126 volts over the course of a day. I need to correct this before ever plugging in one of Bobs kits. The ideal solution would be something like PS Audios power regenerators with a perfect 120v 60hz sine wave coming through. Even used these go for $1400 or more, and thats just not in the cards right now. At the low end I can get cheap chinese made variacs for under $100 which will step down the voltage say 6 volts so I will be getting 116 to 120 out of the wall. I am looking for ideas for something in between these two extremes. I don't have a specific budget but $300 to $500 feels about right. Curious what the members here have done to solve this issue? It may be a tall order but ideally the solution can keep a stable 120v not just stepping it down a fixed amount. Of course it needs to provide enough juice for 2x 125 watt amps. Some type of filter would be appreciated- its a rental house at the moment so I can't add new circuits or change a whole lot that happens before the outlet. Is this possible?