First a comment (maybe a solution) then my question. I plugged a cheapo pair of mp3 player headphones into my tablet, then played music on youtube. I heard a horrible distant whine until the music started playing, and of course the music drowned out the whine. However, I then viewed a talk on youtube and heard the same whine but it was worse because the sound of the voices didn't drown out the whine. So, I uploaded a music file and video into the tablet and got the same whine. Undaunted, I thought it might be the phones, so I jacked in a 30-year-old pair of sony MDR-50 phones and hey presto, no more whine from anywhere. So if anyone else has this prob, I'd guess it's the phones. However, now the question. Why did my very old phones cut out the whine? And 2nd, when I buy a new pair of phones what do I look out for so I don't repeat the unwanted whine experience?