Most power conditioners remove noise from the AC, but cannot change the supplied voltage. In my case, I had high voltage and wanted to reduce it in order to extend tube life. I bought both a PS Audio P10 and a P5 for my primary and secondary systems. They do a very nice job of regulating AC voltage at a set point, removing harmonic distortion, and removing DC offset. I am very pleased with both units.
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Heres a power conditioner that regulates over and under voltage plus its a filter too, have used this for many years, I run the entire front end of my system on this one. Highly recommended and it does not break the bank either.