How to tell if your AC wiring needs an upgrade

Eric,

Thanks, I just bought one of these.  I recently spent quite a bit of time troublshooting input transformer hum on a tube amp.  The OEM insisted that it was almost certainly DC offset.  It took quite a while to convince myself I had no DC offset and eventually found a blow fuse in the amp taking out one half of the rectifier.   Obviously that fixed the problem. --Jerry

A few years ago, I got a good deal on "as new" Klipsch La Scalla II speakers. I was so excited, I purchased a demo Primaluna prologue premium integrated amp. Couldn't wait to hear them! Wouldn't you know, there was a buzz I could hear 12 feet away at my listening position. Sent the amp to Upscale Audio (not the seller) who gave the amp a clean bill of health. The speakers worked fine with other amps so the problem must have been with my A/C. Drat! Anyone know the cost of a whole-house rewire?