No issues here. Maybe try a friend's home to double check that's it's not a power line or DC on power line issue?
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Thanks for your reply Nkbg
I did try it in another home, with the same result. I sent it back to the dealers and they agreed the buzz was unacceptable. What they feel is that as we need 230vac over here this means a larger transformer is required which might be exacerbating the issue. Anyway, a new transformer is on order which should hopefully sort it out.