We're getting ready to make an offer on a house that was built in the 60's. Upon inspection, we found the electrical wiring to be safe and in very good condition, but all outlets accept only 2-pronged power cords. Can we use 3-pronged surge protectors with 2-pronged adapters for audio/video gear? Both my sons have their own stereo systems. My wife and I have a bedroom system. We have a family room system for movies. And I have a 2-channel system mainly for spinning records. At least one piece in each system has a 3-pronged power cord. I've used 2-pronged adapters for microwaves and even refridgerators in the past, but not for a/v gear. I need to know whether we need to factor in the cost of upgrading the electrical wiring for our offer. Comments will be appreciated.