Problem with AC and how to solve it

I'd recommend Tripplite available at digikey.com or newark.com.
These power conditioners are being used for X-ray machines at hospitals so the power quality speaks easily for itself.

Thanks everybody. I'm new on this site and I'm quite amazed by all the help I'm getting from you guys. Not beeing a true audiophile, I've never been truly interested in the technical aspects of the hobby (passion).Though I recognize the importance of a decent rig, I mostly concentrate on music. But when a problem arrises that prevents me from appreciating the music, I'm always glad I can count on someone who understands what is going on inside de boxes.

Following Bigtee's response, I unplugged everything in the house to see if it made any difference. It didn't but I realized that I heard the damned buzz even when the amps are off. I went outside the house and realised there is a similar noise coming from the transformer (witch is about 50 feet from the house). I think the noise is mechanically transmitted to the house by the metal cable to witch the electrical wire is attached. That would mean the transformer is vibrating quite a lot. Of course that's different problem (I think). The question is this: could a buzz (or hum?) in the transformer outside the house generate a similar problem in the transformers in my amps?

Or should I simply have a few more single malts and forget about everything?

Could anyone explain in a few words what RFI is?

P.S. English is not my first language. I hope you will excuse the mistakes I probably made.

Thanks once again.

The mechanical noise of a transformer may not affect the electrical at all unless it is the noise is caused by severe overloading In that case, current can vary. Roughly 50% of transformers hum naturally or because of the poor quality of electricity they are supplied.

If the noise is physically transmitted through the wire, like cans and string, contact the utility and request(demand?) a solution.

You have a request for information about RFI? Radio frequency intererence is generated by most electronics but more so by high frequency devices such as digital and video. It is transmitted through the air as opposed to EMI, which is transmitted through wires.

http://www.arrl.org/tis/info/rfigen.html

Thanks Ngjockey, very usefull info. Following your advice, I called the utility. They kept me waiting for about a half hour. I finally talked to someone to whom I could explain the nature of the problem and guess what, this guy is an audiophile!!! He told me that since I was the only one plugged on this transformer I should not hope for any solution on their part unless the transformer blows. He suggested, like some of you guys did, buying some power conditionning. I think I'll do that.

Halogen pot lights were the cause of buzzing in my system.