AVS Special Member
Join Date: Sep 2003
Location: Central Illinois
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With the humming, buzzing issue, I wonder if there was either a bad batch of boards used on some of these, or, perhaps a component on the affected board was out of spec.
I'm sure Onkyo didn't intentionally create this issue and the 606 has been out for awhile. Might just be luck of the draw on what you get, unless the serial number modification scheme proves to be a sure fire fix.
I have one with no issues and have tested it every way described here in this thread.
Unfortunately, Onkyo is not known for their customer service or customer friendly repair practices (you pay to send things into them) so if you got a bad one you are pretty much at the mercy of your vendor as far as returns.