<!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 6.00.2800.1126" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Good thought David, and add to that the = thicker wire will not go on as smoothly resisting the stringer resulting in = little errors of diameter fluxuations causing false nodal points along the = string length.</FONT></DIV> <DIV> </DIV> <DIV>Joe Goss<BR><A href="mailto:imatunr@srvinet.com">imatunr@srvinet.com</A><BR><A href="http://www.mothergoosetools.com">www.mothergoosetools.com</A></DI= V> <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=davidlovepianos@earthlink.net href="mailto:davidlovepianos@earthlink.net">David Love</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> ; <A title=BobDavis88@aol.com href="mailto:BobDavis88@aol.com">BobDavis88@aol.com</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, January 24, 2003 = 2:08 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Yow-yow-yowing = bass strings</DIV> <DIV><BR></DIV> <DIV><FONT face="MS Sans Serif" size=2>Since it occurs = irregularly, it would make sense to look at the string manufacturing process.  My = inclination (and I know you didn't want speculation) is that it has something to = do with how the wrapped portion of the string is tensioned onto the core = wire.  Too much tension, for example, might cause the core wire to = twist, or somehow become torqued in a way that creates irregular or = mismatched patterns when the string is set to vibrating.  Since this problem = seems to occur mostly in the heavier wrapped = strings, it may be because the thicker diameter of the wrappings in these strings requires more tension in the horizontal direction while = the string is being wrapped.  The need for greater tension = may tend to create more variation in tension, simply put, it might be harder to hold it steady.  It might be interesting to = compare two strings, one that ! yows and one that doesn't, off the piano by = allowing them to hang freely and see if the yowing one differs in terms of the = amount of natural twist.  </FONT></DIV> <DIV><FONT face="MS Sans Serif" size=2></FONT> </DIV> <DIV><FONT face="MS Sans Serif" size=2>Just a = thought.</FONT></DIV> <DIV> </DIV> <DIV><FONT face="MS Sans Serif" size=2> <DIV>David Love</DIV> <DIV><A = href="mailto:davidlovepianos@earthlink.net">davidlovepianos@earthlink.n= et</A></DIV> <DIV> </DIV></FONT></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=BobDavis88@aol.com = href="mailto:BobDavis88@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> 1/23/2003 6:58:17 PM = </DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Yow-yow-yowing = bass strings</DIV> <DIV><BR></DIV><FONT size=2><FONT face=arial,helvetica><FONT = lang=0 face=Arial size=2 FAMILY="SANSSERIF">Thanks to those who have = responded so far about this. I thought I'd better send an interim response, so = you'd know I'm still listening.<BR><BR>First, let me clarify what I know so = far, and rule out a few things. I agree with Ron that this is definitely not = a voicing issue, nor a termination issue. It's not in the leveling. = It's not a leaky damper, nor an undamped segment of another string. It's not in = the hammer at all, or rather in the angle of attack of the hammer (sorry = Sarah, interesting post), since the strings exhibit at least similar = behavior when plucked; at least the yowing ones still yow, and the clean ones are = still clean. It seems to be in the string itself, and consists of beats. = What I really want to know is what is beating against what, and while I = really really really didn't want to speculate, the hypothesis that seems = most convincing to me so far was post! ed by John = Musselwhite:<BR><BR>"Would those problematic single bass strings have LMFs [longitudinal mode frequencies] that are either unstable or out of tune with the rest = of the string?"<BR><BR>I have the CD from the Five Lectures, but I can't = lay my hands on it right now. However, my memory is while the longitudinal = modes produce different pitches, they are clear pitches, and not beating = (?) Still, beating suggests non-harmonic stuff beating with harmonic = stuff. <BR>-----<BR>Well, I took a look at Conklin's patent on longitudinal = mode design, and now I understand more than I wanted to. It looks as if = the longitudinal mode can be tuned by controlling the weight per unit = length of the wire, including core and loading, and falls roughly in the area = four octaves+  above the fundamental pitch of the string. I still = don't know for sure if this can beat with the partials produced by the normal = flexural modes, but I don't see why not, and if so, I don't understand how = you cou! ld reliably make bass strings ever, especially if they are so = sensitive that the same string on the same model can come out either wonderful or hideous.<BR><BR>One of you scientists out there set us straight. I'm = getting interested in this, and I don't have time to be = interested.<BR><BR>Bob Davis</FONT> </FONT></FONT></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>