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#3010271 08/04/20 07:47 PM
Joined: Jun 2013
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Hello,

I have asked this question to many technicians and can never get a decent answer. How much fluctuation (up and down) in the percentage of relative humidity does it take to really start to noticeably alter tuning? I keep my piano room at 45% year round. It’s easier in the winter. This summer I have had a hard time keeping it steady. It can go as low as 40% and as high as 50%. Of course you can hear tuning changes with minute fluctuations, but my piano is good at keeping its tuning and returning to it when the humidity goes back to normal.

So, how much percentage change until things start to stay out of tune even when returning to 45%?

Thanks,
Mike


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If all pianos were exactly the same there may be a satisfactory answer to your question.
So many variables.


RPT
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The piano will take time to absorb water during the humidity increases and dry out when the humidity decreases. I've found that its at least 24 hours at the earliest for a measurable effect assuming no temperature changes (those have a rapid effect on tune). Over what period of time are the fluctuations?


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You might try measuring it. But IMO it won’t be significantly higher.


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