Message
Re: [disklavier] Disklavier Power Supply Audible Noise (Squeal)
2013-10-27 by Adrian Thomas
Adrian Thomas
On Oct 26 2013, Dan Waxer wrote:
>I have a Grand Disklavier and It works quite well.
>
>I have noticed that the power supply makes a high frequency squeal, quite similar to how an old Television set would make an audible 15 kilohertz noise from the flyback transformer. The sound it makes varies somewhat depending on load. So if there is more load on the power supply it changes in real time as power is drawn.
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>I have never noticed this before.
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>Can someone tell me:
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>(1) Could this be normal and power supplies are squealing and I just never noticed before? I find it quite noticeable in my piano room with hard floors and many reflections.
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>(2) If it is abnormal, which I think it is, the power supply clearly works normally in every way (except for the squeal) so, what is wrong with it, is this something someone has heard about and perhaps fixed in some way?
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>Any other information is appreciated.
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>Dan
>