<HTML style="FONT-SIZE: x-small; FONT-FAMILY: MS Sans Serif"><HEAD> <META http-equiv=Content-Type content="text/html; charset=windows-1252"> <META content="MSHTML 6.00.5730.11" name=GENERATOR></HEAD> <BODY style="BORDER-TOP-STYLE: none; BORDER-RIGHT-STYLE: none; BORDER-LEFT-STYLE: none; BORDER-BOTTOM-STYLE: none"> <P>Though it must have been a long time ago, I know I read something authoritative that said this issue had been studied by someone (Sanderson?) and it was demonstrated that all changes to system tension, torsion, etc., were instantaneous. I remember it because it certainly flew in the face of the conventional wisdom.</P> <P>I think the article, or whatever it was, was on the topic of A0 to C88, bottom to top, over/under-pull pitch correction.</P> <P>On the other hand, every time you move a piano it needs retuning, right?<BR><BR>Alan Barnard<BR>Salem, MO<BR>Joshua 24:15<BR><BR><BR><BR></P> <DIV style="PADDING-RIGHT: 5px; PADDING-LEFT: 5px; PADDING-BOTTOM: 5px; BORDER-LEFT: #000000 3px solid; PADDING-TOP: 5px"> <HR> Original message<BR>From: "Joseph Garrett" <JOEGARRETT@EARTHLINK.NET><BR>To: pianotech <PIANOTECH@PTG.ORG><BR>Received: 02/06/2007 3:51:24 PM<BR>Subject: Re: pitch lowering<BR><BR> <P> <DIV> <DIV align=left><FONT size=+0>My own theory on pitch raising and lowering has to do with the soundboard </FONT></DIV> <DIV><FONT size=+0>catching up with the pitch change in the wire. I believe the soundboard </FONT></DIV> <DIV><FONT size=+0>takes at least hours to conform to the new tension (whether higher or lower) </FONT></DIV> <DIV><FONT size=+0>and regardless of how much in one sitting you change the pitch to stabilize </FONT></DIV> <DIV><FONT size=+0>it will still change more because of the inability of the soundboard to </FONT></DIV> <DIV><FONT size=+0>adopt to the new tension level that quickly. That is why on pitch raises </FONT></DIV> <DIV><FONT size=+0>(over 25c) I come back in 2 weeks after to retune..</FONT></DIV> <DIV><FONT size=3></FONT> </DIV> <DIV><FONT size=3></FONT> </DIV> <DIV><FONT size=3>One should, also, take into consideration the de-compression of the plate and the rest of the structure. It is ALL connected, you know.<G></FONT></DIV></DIV> <DIV> </DIV> <DIV> </DIV> <DIV>Joe Garrett, R.P.T.</DIV> <DIV>Captain of the Tool Police</DIV> <DIV>Squares R I</DIV> <DIV> </DIV> <P></P></DIV></BODY></HTML>