> A colleague of mine has a client >whose C3 has a gap between block and flange tapering from 33 thou in the >bass to about 11 thou in the treble. The piano apparently suffers from >tuning instability despite proper humidity control (Dampp Chaser) and >frequent tuning. > >Stan Kroeker Jim Bryant beat me to it. We have a piano that "apparently" suffers tuning instability and are generally assuming it must be the pinblock fit, since the Dampp-Chaser takes up any other conceivable slack, right? Before we can perform a fix on anything, don't we need to determine what the problem is, or even if there really is a problem? Like Jim said, church environmental "control" systems can overpower the best Dammp-Chaser installation you'll ever see. Also, how unstable is "unstable". I have unregulated pianos in schools and churches that I have to raise/drop 20-30 cents, twice a year. On the other hand, I have pianos in well regulated environments that are still noticeably out of tune with the seasonal change. They move, but I wouldn't call them unstable. I generally find Yamahas to be the quickest to stabilize when new, and the most stable with humidity shifts, of anything I tune. Let's define the symptoms and the conditions under which they occur a little better before we fix anything. Ron
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