John, I wouldn't expect a 7% humidity increase to make *that* much difference. But if you had several dry days before the April 6 tuning and several very humid days before yesterday's tuning, that could have a substantial impact on the pitch of the piano. Regards, Clyde "John M. Formsma" wrote: > I had last tuned this piano on 4/6/01 with the temperature and humidity at > 72F and 63%. The piano was basically at A440 at that time. Yesterday, the > temp was 70F and the RH was 70%. The piano was sharp everywhere--A4 was +12, > A3 was +20, the bass was about +7, and the treble was about +10. > > I don't service that many U1s this often, so I don't get to monitor pitch > changes like I do with this one. Is it typical to expect that much change > with a 7% RH increase?
This PTG archive page provided courtesy of Moy Piano Service, LLC