One possibility would be to purchase a high-capacity line voltage regulator from a surplus store. These aren't too hard to find and are usually cheap (~100 bux). They will give you excellent voltage regulation, just be sure they have the capacity to power your amp. You may then need to add power conditioning because the old VR, while it will hold the voltage rock steady, won't necessarily clean up the junk on the power line.
Is their any way to keep voltage steady?
I have a Tice Powerblock which has a voltage meter on it. I notice when the meter is close to 120v the system sounds and looks {TV} better , than when the meter dips to around 115V. I have already added two dedicated 20amp circuts with 12 gauge wire and "better" wall sockets. Anything simple I can have my electrician do?