<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML style="FONT-SIZE: x-small; FONT-FAMILY: MS Sans Serif" xmlns="http://www.w3.org/TR/REC-html40" xmlns:o = "urn:schemas-microsoft-com:office:office" xmlns:w = "urn:schemas-microsoft-com:office:word" xmlns:st1 = "urn:schemas-microsoft-com:office:smarttags"><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content=Word.Document name=ProgId> <META content="MSHTML 6.00.2800.1400" name=GENERATOR> <META content="Microsoft Word 10" name=Originator><LINK href="cid:filelist.xml@01C453F0.E6CF2C90" = rel=File-List><o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"></o:SmartTagType> <STYLE>st1\:* { BEHAVIOR: url(#default#ieooui) } </STYLE> <STYLE>  </STYLE> </HEAD> <BODY lang=EN-US style="tab-interval: .5in" vLink=blue link=blue = bgColor=#ffffff> <DIV><FONT face=Arial>Agree. And on an upright with a DC installation, = I make sure to keep the kneeboard in place while tuning. I have noticed pitch fluctuations in such a case when it has been removed.</FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV> <DIV><FONT face=Arial>Terry Farrell</FONT></DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=pmc033@earthlink.net = href="mailto:pmc033@earthlink.net">Paul McCloud</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">Pianotech</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, June 17, 2004 = 7:33 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> RE: Unstable Yamaha = C7</DIV> <DIV><BR></DIV> <DIV>Mark:</DIV> <DIV>    I think your problem is definitely the temperature fluctuation.  I always ask the customer to close the door/window to eliminate any breeze over the piano.  I also ask = them not to change any climate control that they normally use when I'm not = there.  (Sometimes they'll turn the air cond. to make me comfortable).   = I've found that any change in temperature around the piano affects my = tuning, and the strings are vulnerable to temperature changes especially when the = cabinet is opened for tuning (uprights).   </DIV> <DIV>    Hope this helps,</DIV> <DIV>    </DIV> <DIV>    Paul McCloud</DIV> <DIV>    San Diego</DIV> <DIV> </DIV> <DIV></DIV> <DIV> </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid"> <DIV style="FONT: 10pt Arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=mark@nhpianos.com href="mailto:mark@nhpianos.com">Mark = Dierauf</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> 06/16/2004 6:28:04 PM = </DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Unstable Yamaha = C7</DIV> <DIV><BR></DIV><FONT size=2> <DIV class=Section1> <P class=MsoNormal><FONT face="Times New Roman" color=navy = size=3><SPAN style="FONT-SIZE: 12pt; COLOR: navy">I take care of an older = Yamaha at a recording studio that has a tuning instability problem that I’ve = never encountered on any other piano – the pitch fluctuates by as much = as 3 or 4 cents over the course of only a few minutes. It took me quite a = while to realize that this fluctuation ran in sync with the forced hot air = heating system. Now that it’s summer, the air-conditioning from the same = vents is having the same effect. The piano has a complete DC unit installed = with a bottom cover, is tuned at least 20x annually, and is very = pitch-stable in the long term. It is not located in direct sunlight and the = temperature doesn’t vary much, certainly not within seasons. In the winter = there is a humidity control system adding moisture through the hot air ducts. = The studio is in an old </SPAN></FONT><st1:place><FONT = color=navy><SPAN style="COLOR: navy">New England</SPAN></FONT!></st1:place><FONT color=navy><SPAN style="COLOR: navy"> barn that had several = hundred thousand dollars worth of renovation, and so is very well finished and = insulated, but in the time that it takes me to work through the temperament the = first notes tuned have already moved substantially. Once after chasing the pitch = all through a tuning I repeated A4 for several minutes and watched the = pitch rise about 2 cents above the starting point then fall about 2 cents = below. This cycle kept repeating as I watched. Has anyone ever seen such a = problem? Did you find any solutions?<o:p></o:p></SPAN></FONT></P> <P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: = Arial"><o:p> </o:p></SPAN></FONT></P> <P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">- = Mark<o:p></o:p></SPAN></FONT></P></DIV></FONT></BLOCKQUOTE></BLOCKQUOTE><= /FONT></BODY></HTML>