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<DIV><FONT face="Arial Narrow"> Yes, it has been observed
often by many techs that the strings with the longer lengths from upper bearing
point (pressure bar, capo, agraffe) to tuning pin go out of tune to a lesser
degree than those with the shorter upper "waste end." (or is it the other
way around?) </FONT></DIV>
<DIV><FONT face="Arial Narrow"> Anyhow, I think that's only
one factor. Despite our best efforts to set the pin and equalize the
various string segments, they're probably never 100% stable and equalized, and
there's always that tension trying to make them go flat, so when case, board,
and bridges expand or contract, the three strings of each unison (or two) don't
necessarily move the exact same amounts. And we know how little it takes
to put a slight "meow" in a unison.</FONT></DIV>
<DIV><FONT face="Arial Narrow"> --David Nereson,
RPT</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=pianovt@yahoo.com href="mailto:pianovt@yahoo.com">V T</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> Wednesday, July 16, 2008 12:18
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> summer sharpness in low
tenor</DIV>
<DIV><BR></DIV><BR><BR>Now that we covered the tenor and the low tenor, on to
a more irritating stability problem: Unisons that go out with
humidity.<BR><BR>At first, one might wonder why three strings that are so
close together on the bridge would follow independent pitch trajectories when
the humidity changes. I did notice that, on my piano, the problem was most
objectionable in the low and mid treble, but probably just as present all the
way to the top.<BR><BR>Speculatively speaking, I think it has to do with the
fact that the total string lengths among the three strings are not really
equal because of the tuning pin locations. Any thoughts about
this?<BR><BR>>Most pianos go quite sharp in the summer because of higher
humidity, and<BR>>the sharpness is most pronounced in the low
tenor.<BR><BR>Vladan<BR><BR><BR>
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