<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2800.1276" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>It's always been my impression that = tuning instability around the lower tenor(treble bridge) is due to the = soundboard expansion and contraction caused by changes in humidity. That this area = of the board is sort of a peak. Anyone care to illuminate me. It's a dark and = foggy day here.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Phil Frankenberg<BR>CSUC Chico, = Ca.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV> </DIV> <DIV>----- Original Message ----- </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=Tvak@aol.com href="mailto:Tvak@aol.com">Tvak@aol.com</A> = </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, January 17, = 2004 12:17 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> tuning = instability/plate struts</DIV> <DIV><BR></DIV><FONT face=arial,helvetica><FONT face=Geneva = color=#000000 size=2 FAMILY="SANSSERIF">List<BR><BR>Certainly I think we can = agree that strings near the plate struts go out of tune more than those in the = center of their sections.  And when it comes to the tenor break, I think I = can understand why this would happen.  The treble bridge ends there, = often the stringing scale goes to copper-wound strings for the last couple = of unisons and I imagine the tension of those strings differs from their = steel neighbors.  And right on the other side of the break, the strings = are strung across in another direction; all of those things could probably = contribute to instability, although I say this not out of knowledge of = the situation, but just looking at it in a logical (but basically = uninformed) way.<BR><BR>But why does this also happen in the treble break?  = Often there's one continuous bridge.  Steel strings on both = sides.  All strung parallel.  And yet notes on either side of this break = generally go out quicker and farther.<BR><BR>Why should those strings be less = stable?  <BR><BR>Tom Sivak </FONT><FONT face=Geneva color=#000000 size=2 FAMILY="SANSSERIF"></FONT></FONT></BLOCKQUOTE></BODY></HTML>