yes, Hamburg B, and same agraffe. Allen On Jul 17, 2008, at 2:20 AM, David Ilvedson wrote: > Hi Allen, > > Is this a Hamburg B? Were you able to get the exact agraffe to > match the original? > > David Ilvedson, RPT > Pacifica, CA 94044 > Original message > From: "Allen Wright" > To: "Ed Sutton" , "Pianotech List" > Received: 7/16/2008 12:49:54 PM > Subject: Re: String noises revisited > > I replaced two agraffes on the most noticeable offenders today, and > both notes were greatly improved; perhaps 60 - 70% less high > whistle. The first one I replaced was on F#3, the note the customer > was most annoyed by. That note was then so much quieter that the F > next to it jumped out as being the worst, so I thought I'd better > try it on that one as well. Obviously this could go on forever, and > be quite time-consuming - so I've stopped it at that. > > > I do seem to notice some slight abrasions (in one of the holes > especially) of the agraffes. The best guess I can make is that this > noise, which is so common in that section of B's and D's, may be > some kind of inherent scaling "characteristic" (tactful, no?) which > is exacerbated by any imperfection in the corresponding agraffe. > It's just not logical that this can only be related to agraffe > problems; it wouldn't just be in that section. > > Like so many things dealing with piano tone, I haven't found a > black-and-white solution. But at least it's greatly improved - so > that all the notes in that section have the same amount of this > noise - and the customer knows I've gone the whole nine yards. > > Allen Wright > > > > On Jul 13, 2008, at 3:32 AM, Ed Sutton wrote: > >> Allen, >> Not a lot of hope, short of redesigning the piano. >> The longitudinal partial is being excited by the combined energies >> of the 7th and 8th partials. >> If you can get the hammer to strike at exactly 1/7th or 1/8th of >> the string length, it may reduce the energy enough to stop the >> sound. This may be the reason for the old design rule to strike at >> 1/7th of the string length. >> On smaller pianos the longitudinal mode may be at the 17th or 19th >> partials of plain wire strings. >> Ed Sutton >> ----- Original Message ----- >> From: Allen Wright >> To: Ed Sutton ; Pianotech List >> Sent: Saturday, July 12, 2008 6:23 PM >> Subject: Re: String noises revisited >> >> Ed, >> >> This sounds like an exact description of what I'm dealing with. >> Octave three - 15th partial - disappears with pitch change; all yes. >> >> I want to read Jim's book now....does he suggest any fix for this, >> or is it a scaling problem (or simply unavoidable) or what? >> >> Allen >> >> >> On Jul 12, 2008, at 2:38 AM, Ed Sutton wrote: >> >>> Allen- >>> >>> If I understand Jim Ellis' book, in a 7 foot grand piano, >>> longitudinal mode noises will tend to occur in octave 3, and they >>> will tend almost always to be at or near the frequency of the >>> 15th partial. There will probably be a slight delay after the >>> attack and before the sound develops. If you make slight changes >>> in the pitch of the string, the longitudinal mode sound will not >>> change pitch, but will disappear when the pitch has changed such >>> that the modes that excite the longitudinal mode are outside of >>> its resonance band. >>> >> >> >> >> >> >> >> > > > > > > Allen Wright London, UK http://www.broadjam.com/akwright -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20080717/78a1dd2c/attachment-0001.html
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