It will do nothing! Your gear has power supplies that adequately filter the AC and produce pure DC to the circuitry.
Isolation transformer question
I know people who say they have bad power, and want to buy an isolation transformer.
When it comes to audio improvements, what will an isolation transformer do that all of the transformers in your gear aren't already doing?
(I'm not talking about "power conditioners" which include many things like filter capacitors, inductors, and so on)