Quote:
Originally Posted by TGS
I can hear it if I put the back of the unit up against my ear, and, because I'm very old, I can't hear anything above 12 khz on the Mosquito test. I don't on the whole though read with the back of the unit against my ear so I can't see it being a problem - just wish you hadn't told me about it because now I'll be listening for it! 
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Just did your test.
When pressing my ear to the back, I hear it.
It sounds somewhat like briefly flicking a spiral spring and listening to it vibrating.
Never would have heard it in "normal reading position", looking at the front with a distance >> 20cm instead of pressing the ear to the back.