The other week we could not trace the whine/buzz anywhere. We went ALL over the house, listened to every device, stood outside - nothing. THEN .... traced it to the electric door bell box just above the inside Hall door. A delivery man had rung the bell an hour or so previously and the bell push had stuck in. As soon as it was released the noise stopped.
Grandson of New Limerick (Son of New Limerick contd.)
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. For the next three months or so there was a high-pitched whine that only I could hear, and only when it was quiet. It went after a few months.....or I just got used to it.