---------------------- multipart/alternative attachment Wim I've read your post & I feel your pain but whenever I experience unison instability myself I almost always except the fact that a pin or 2 didn't quite get set right. Especially if this is a piano I know well. My Dad taught me to use firm blows & I still do but as I got older I found that my excess pounding was a substitute for more accurate pin technique. As someone said overpounding can cause instability when coupled with a pin not quite set in equilibrium. I know there are other factors like the pins leaning against the plate, temp & humidity but the tunings of the best tuners I know all exhibit a clean unisons that stay trademark & a wounded pride when instability shows up during a concert. Dale OK, what exactly is happening when a string goes out of tune. I know about climatic changes that effect the soundboard. This causes the who piano, or at least whole sections to go out of tune. I can accept that. But I pride myself on setting the string and the pin. I am a pounder. On new pianos, (at least new to me), and especially concert instruments. I beat the daylights out the notes to get them to stabilize. But there are still strings that go out. That is why we tune concert instruments numerous times, with strings still going out. I tune a D for a church once a month. I pound until my fingers hurt but I leave the string with the lights standing absolutely still. But every time I tune it, the piano is "in tune" in that it hasn't changed pitch over all, but there are at least 2 dozen strings that have "slipped." They are 2 or 3 cents off. I'm not talking notes, I am talking string. The right string of one note is 3 cents low, or the left string of another note is 2 cents flat. Why is that? Why do just these strings go out, and not the other ones? Am I still not pounding hard enough, or is the combination of slight variations in temperature, combined with strings that maybe weren't set right, causing this? Inquiring minds want to know. Wim Willem Blees, RPT Piano Technician School of Music University of Erwins Pianos Restorations 4721 Parker Rd. Modesto, Ca 95357 209-577-8397 Rebuilt Steinway , Mason &Hamlin Sales www.Erwinspiano.com ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/3e/65/81/4c/attachment.htm ---------------------- multipart/alternative attachment--
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