Number 1 recommendation is to have it modified internally by the manufacturer or a very good technician using their instructions. Next would be to use a transformer from 220v to 115vm but for the gear you have, you will need at least 1200w, and it will probably cost >$600. Note each country has a slightly different plug and you will have to plug everthing into a 115v US distrubuter from the transformer. Get a Radio Schack 3 prong tester to be sure anything you plug into has the right grounding. The 50hz standard is only a problem for turntables without quartz lock freq. As audioquest4life, I have done this. Do NOT buy a crap walmart adapter, they only contain a dropping resistor, and don't even work on a hair dryer.
