This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Hi Bob, If you have ever in fustration over twisted a string and then examined = that string when it broke, ( Oh surely not I <G>) you would see that = several different lengths or segments can be set in the strings length. This is part of what I think causes the string to wow wow. Another might = be the wrap getting disloged from the core along its length either due = to loosening of the core and or corrosion. Ever see spots of corrosion = along the string? They never seem to be at the nodal points where they = would be any good. Joe Goss imatunr@srvinet.com www.mothergoosetools.com ----- Original Message -----=20 From: BobDavis88@aol.com=20 To: pianotech@ptg.org=20 Sent: Friday, January 24, 2003 12:58 AM Subject: Re: Yow-yow-yowing bass strings 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. 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 posted by John Musselwhite: "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?" 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.=20 ----- 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 could 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. One of you scientists out there set us straight. I'm getting = interested in this, and I don't have time to be interested. Bob Davis ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/15/7b/01/96/attachment.htm ---------------------- multipart/alternative attachment--
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