List, I just worked on a fabulous new Yamaha U5. I have to handed to the folks at Yamaha...this is about as nice of an upright as I have yet to experience. Except for the single escapement action, this is literally a grand piano turned vertical. Agraffes, full sostenuto, incredible smooth tuning curve... a true pleasure to tune and play. If they could only figure a way to figure in a left pedal shift mechanism. Keep up the good work Yamaha!!! Tom Servinsky,RPT ----- Original Message ----- From: "Don" <pianotuna@accesscomm.ca> To: <pianotech@ptg.org> Sent: Thursday, February 07, 2002 10:05 AM Subject: Re: Piano acoustics > Hi Ric, > > I do agree that an ETD will give different results in such measurements. > One might instead of using a quartz crystal type sound producing device use > a tone bar with a striker. The problem with measurements in a piano is the > method by which the string is excited. It is very difficult to strike the > key in an identical manner 5 times in a row. I do wish someone with access > to one of the diskclavier style actions would try to do some measurements. > There was one study done a while ago and I did post the url to the list. > > The accuracy of the best EDT's is not at question. The method of using them > for measurements *is*. > > At 12:38 AM 2/7/02 -0600, you wrote: > >I have no doubt you are measuring differences of inharmonicity. > > <snip> > >the machines are not consistant with inharmomicity readings then > >they could be compared to reading the fundamental of a sound or tone > >source such quartz digital instrument, or the shortwave broadcasts. An > >experiment with one ETD yielded wild results in FAC type measurements, but > >no detectible differences between repeated measurements of an audio tone > >(fundamental) from an electronic digital source. ( a Korg Digital Tuner > >DT-1 from about 1987). From that I conclude the ETD, (a share ware version > >of TuneLab97) and the Korg are extemely stable in producing and detecting > >the fundamental. ---ric > > > > > >----- Original Message ----- > >From: Don <pianotuna@accesscomm.ca> > >To: <pianotech@ptg.org> > >Sent: Tuesday, February 05, 2002 10:49 AM > >Subject: Re: Piano acoustics > > > > > >
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