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<DIV>Stephane-</DIV>
<DIV>Would you tell us your impressions of Pure Sound wire?</DIV>
<DIV>Ed Sutton<BR><BR><BR></DIV>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 0px; BORDER-LEFT: #0000ff 2px solid">-----Original Message----- <BR>From: Stéphane Collin <COLLIN.S@SKYNET.BE><BR>Sent: Jul 26, 2006 5:49 AM <BR>To: Pianotech List <PIANOTECH@PTG.ORG><BR>Subject: Re: A 435 or A 440 ? <BR><BR><ZZZHTML><ZZZHEAD><ZZZMETA content="text/html; charset=iso-8859-1" http-equiv="Content-Type"><ZZZMETA content="MSHTML 6.00.2900.2912" name="GENERATOR">
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<DIV><FONT face=Arial size=2>Hello Jack.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I put the formulas into a spreadsheet, and here is what I got.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I analysed the scaling of a piano whose A4 strings are 357 mm long and 0,850 mm diameter. More than the right half of the scaling is pure pythagorean with an octave length ratio of 2.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Suppose you use Röslau wire, here are some numbers :</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2> tension in one string at 440 Hz : 44.8 Kg at 435 Hz : 43.8 Kg</FONT></DIV>
<DIV><FONT face=Arial size=2> total tension on the frame 11.141 Kg 10.889 Kg</FONT></DIV>
<DIV><FONT face=Arial size=2> % of breaking strain 33 % 32 %</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Suppose you use Pure Sound wire</FONT></DIV>
<DIV><FONT face=Arial size=2>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2> tension in one string at 440 Hz : 45.1 Kg at 435 Hz : 44.1 Kg</FONT></DIV>
<DIV><FONT face=Arial size=2> total tension on the frame 11.212 Kg 10.958 Kg</FONT></DIV>
<DIV><FONT face=Arial size=2> % of breaking strain 40 % 39 %</FONT></DIV>
<DIV> </DIV>
<DIV>So indeed, tension variations on the frame are not a concern, methink.</DIV>
<DIV>Now, the higher you tune one same string, the less inharmonicity you can expect, but also less sustain. While difficult to realize on one single string, I believe that when playing the piano in its whole you certainly notice the difference, both in sound feel and touch feel.</DIV>
<DIV> </DIV>
<DIV>Best regards.</DIV>
<DIV> </DIV>
<DIV>Stéphane Collin.</DIV></FONT></DIV>
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<DIV><FONT face=Arial size=2></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=JackHouweling@dccnet.com href="mailto:JackHouweling@dccnet.com">Jack Houweling</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> Wednesday, July 26, 2006 7:01 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> A 435 or A 440 ?</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Hello</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I am working on a Mason and Risch grand piano and the plate has a stamp that says " International Pitch A 435" .</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Is it best to tune this piano to A 435 ?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The mother tells me the daughter has perfect pitch. She is away at school so I cannot talk to her. Would someone with perfect pitch be bothered by anything other than A 440?</FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Jack Houweling</FONT></DIV></BLOCKQUOTE></ZZZBODY></ZZZHTML></BLOCKQUOTE></BODY>