Yamaha U5....WOW!

[Tom Servinsky]

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
> >
> >
>
>