This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Greetings all -- =20 Here is the response I got from David Durben at Yamaha. I plan on doing = a couple of the suggested tests so that I can learn from them, but my = guess is that since this is occurring on a number of pianos the double-strike = that I am experiencing should be considered acceptable behavior. When you think about it, it really is occurring during a slow movement that is "outside = of normal playing conditions."=20 =20 -- Geoff =20 In this case, the first thing I would mention is that we need the piano = to play correctly under normal playing conditions. As you know, when we = piano technicians are working with a piano, we often will cycle the action = slowly enough to have "malfunctions" occur, which would never occur under = normal playing conditions. We need to be sure that this is happening under = normal playing conditions, and if so, I have some suggestions. First of all, I would want to be sure that the keys are traveling the = full 10mm distance (with about 250 grams pressure). Then of course, check = that letoff is 2mm in the treble, graduating to 3mm in the bass (this looks = very deep, when compared to the 1/16 or 1/8 inch measurement that many of us = have become accustomed to). If these factors are correct, I would next test = the offending keys with the damp pedal engaged. If the problem disappears, = we know that the damper return springs are a little too stiff, and we will = want to carefully ease those off. If that still does not eliminate the = problem (or if pressing the pedal made no difference), we need to check the = hammer return springs, to be sure that they are set strong enough to do their = job. Again, be careful, use samples, and make any adjustments as evenly as possible. ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/c6/f9/76/69/attachment.htm ---------------------- multipart/alternative attachment--
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