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<DIV><FONT face=Arial size=2>Allen-</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Sounds like a perfect description of a longitudinal
mode.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Pitch locks are an interesting suggestion. They're
cheap and won't hurt anything. And it would be a great discovery if they stop
the longitudinal wave.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>For longitudinal mode sounds, Jim Ellis' book
does not recommend changing the string gauge. He suggests (without a lot of
enthusiasm) softening the hammer enough to reduce the energy in the higher
partials. He also says you can try moving the strike point in some
circumstances. You could try sliding the action out a bit to see if it makes a
difference, and if you are very lucky, rehang the hammers.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ed Sutton</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=piano57@comcast.net
href="mailto:piano57@comcast.net">piano57@comcast.net</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> Friday, July 04, 2008 6:11 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: string "noises"</DIV>
<DIV><BR></DIV>
<DIV>Hi Allen,</DIV>
<DIV> </DIV>
<DIV>Do you have any Pitch-locks to try out?</DIV>
<DIV> </DIV>
<DIV>Barbara Richmond, RPT</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<BLOCKQUOTE
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Original message -------------- <BR>From: Allen Wright <<A
href="mailto:akwright@btopenworld.com">akwright@btopenworld.com</A>>
<BR>Has anyone working on Hamburg Steinway B's (or similar instruments)
encountered shimmery high partial noises (quite noticeable) at the level of
4 octaves up (perhaps at the major seventh pitch or thereabouts), in the
area around E3 in the plain wire tenors? Perhaps half dozen notes stand out
like this. I notice that the sound greatly diminishes when I detune the
notes by a semitone or so...is this the longitudinal mode behaviour I've
read about in previous threads?
<DIV><BR></DIV>
<DIV>And if so, are there specific recommendations for changing wire gauge
there in order to eliminate or improve this problem? I'd love to try
something like that - this is a piano belonging to a customer who's really
bothered by the sound. Personally, if it were my piano I think I'd ignore it
and probably not be bothered by it much in a musical context; but you all
know how these things go - that sort of suggestion often doesn't fly with
the concerned customer.</DIV>
<DIV><BR></DIV>
<DIV>Any opinions/suggestions will be most welcome. I've been able to
otherwise even out the voicing nicely, with some lacquer in the bass and
judicious shaping and needling elsewhere, which leads me to be optimistic
that if I can minimize this "feature" the customer may ultimately be quite
happy with the piano again. The piano is in the shop, which means I can go
at it methodically and even experimentally.</DIV>
<DIV><BR></DIV>
<DIV>Sincerely,<BR><BR>
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<DIV>Allen Wright, RPT</DIV>
<DIV>London, UK</DIV>
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