Audiophile APS 1050 regenerator- will output a perfect 120 v/60Hz sinewave when your wall voltage is anywhere from 80-144 volts. It should solve all of your problems if you feel they are related to flucuating line voltage. The 1050 is also a UPS and has short term battery power usage, with additonal battery packs available. It's a very good unit- I used to have one.
http://www.audiophileaps.com/
http://www.audiophileaps.com/