>So I guess it's just one of those things that happen, and I'll just >have to accept it. There is a marked humidity change here on Cape Cod between seasons. Every piece of felt and wood expands in higher humidity producing higher grand hammer height and less lost motion on verticals. Of course, the opposite happens in drier periods. We all know RH how affects tuning pin tightness and key bushings. As far as the tuning goes I liken it to a potato chip curl. Different sections of the scale react differently with RH changes. Not everything drops or rises evenly. Even within the unison, the right string will be the sharpest of the three in high RH. It's just the way it is. As with a pitch raise, it needs more tuning. I tell people, "I can't fight physics". Regards, Jon Page -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20101024/2b8a59b9/attachment.htm>
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