Help for power conditioning of changing current

I live in Moscow, where the audiophile has two problems: 1.) The line is usually not earthed. I got that, with great cost. The voltage here, however, which in Russia like in the rest of Europe is supposed to be 220 Volt, is not only heavvy polluted, but changes rapidly to 200 volt or even lower - or higher. Does anybody know a power line conditioner/filter that might solve these problems and give me a)protection for the equipment (McIntosh C200 preampt, amp, Shahinian Diapason speakers) and b) better sound?
hassel