<!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 6.00.2900.2912" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2></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=collin.s@skynet.be href="mailto:collin.s@skynet.be">Stéphane Collin</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=pianotech@ptg.org href="mailto:pianotech@ptg.org">Pianotech List</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, July 26, 2006 2:39 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Pure Sound (was A 435 or A 440 ?)</DIV> <DIV><BR></DIV> <DIV><FONT face=Arial size=2>Hi Gene.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I suppose that the long bridge on that Knabe makes a "hockey stick" shape in the tenor section (reducing the speaking lengths in that area compared to the logarithmic progression).  Is it so ?</FONT></DIV> <DIV><FONT face=Arial size=2>Not really, the low tenor only slightly curves and foreshortens - not even close to a hockey stick but certainly not straight - nor is it a continuation of log scaling.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>In pianos with plain wire trichords on the tenor end of the long bridge (did I understand that this is your intend ?  replace the long bridge wound bichords by plain trichords ?), the use of shorter speaking length induces a drastic drop in tension for those wires, causing an increase of inharmonicity. </FONT></DIV> <DIV><FONT face=Arial size=2>The piano has 5 wound bichords in the low tenor. My thoughts are to use Pure Sound wire (unwound) in place of wound strings - they would remain bichords.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2> My understanding (following Wolfenden) is that this is meant for the tenor end of the long bridge's notes inharmonicity to meet that of the high notes on the bass bridge, ensuring a smooth transition between the two bridges.  I understood that many redesigners on the list don't like that drop in tension and try to bypass the need for it.  </FONT></DIV> <DIV><FONT face=Arial size=2>The scale plotted on PScale is very typical with low tension and high inharmonicity in these low tenor wound bichords. The match with the upper bass notes is not very pleasing.  I hope to raise tension and lower inharmonicity with the use of Pure Sound bichords on the end of the long bridge and eliminate the wound bichord strings.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>How do the wound bichords on the long bridge sound ?  Too much inharmonicity ? </FONT></DIV> <DIV><FONT face=Arial size=2>The strings were too dead to tell but on PScale this is certainly true.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2> Maybe the Pure Sound trichords could be a good idea there, as you suggest. </FONT></DIV> <DIV><FONT face=Arial size=2>I have not considered Pure Sound trichords but this is possible.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2> But if they sound better, wouldn't the transition between those and the bass bridge be more obvious ?  And also, the volume of the Pure Sound notes would be a concern.  Maybe choosing a thicker gauge would help. </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I have worked this scale using an imaginary third bridge with very good results on paper. </FONT></DIV> <DIV><FONT face=Arial size=2>The Pure Sound is just a desire to solve this problem very inexpensively and labor in-intensively.</FONT></DIV> <DIV><FONT face=Arial size=2>Thank you for your response.</FONT></DIV> <DIV><FONT face=Arial size=2>Gene</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Best regards.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Stéphane Collin.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV>----- Original Message ----- </DIV> <BLOCKQUOTE dir=ltr 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=nelsong@pbic.net href="mailto:nelsong@pbic.net">Gene Nelson</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=pianotech@ptg.org href="mailto:pianotech@ptg.org">Pianotech List</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, July 26, 2006 10:13 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Pure Sound (was A 435 or A 440 ?)</DIV> <DIV><BR></DIV> <DIV><FONT face=Arial size=2>Stephane,</FONT></DIV> <DIV><FONT face=Arial size=2>Thank you very much for this information.</FONT></DIV> <DIV><FONT face=Arial size=2>I do not have any experience with Pure Sound but had entertained the idea of using it in place of wound bi-chords in the lo-tenor of a 5'8" Knabe rather than try to get a string maker to wind the ultra small wrap or make a 3rd bridge.</FONT></DIV> <DIV><FONT face=Arial size=2>Sounds like I could indeed get a bit more tension and less inharmonicity. </FONT></DIV> <DIV><FONT face=Arial size=2>Any thoughts?</FONT></DIV> <DIV><FONT face=Arial size=2>Regards,</FONT></DIV> <DIV><FONT face=Arial size=2>Gene Nelson</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"><FONT face=Arial size=2></FONT> </BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>