stability of pitch raises

[Kevin E. Ramsey]

    Richard;  There are some variables as to how a pitch correction comes
out in the end. One would be the thickness of the plate, and how much it's
going to flex, and the other would be the stiffness of the board. Otherwise,
we could calculate a pitch raise so closely that the tuning would drop right
in every time. At least that's the answer I gave myself while yanking on the
pins wondering how close I'm going to end up, and why or why not.
    BTW, I had to listen to the people on this list a lot before being
convinced that the plate was responsible for any of this pitch-motion.
Before, I thought it was all in the board.
    There; I do listen, and I do think about what I read here.

        Thanks for that!


----- Original Message -----
From: "Richard Brekne" <rbrekne@broadpark.no>
To: <pianotech@ptg.org>
Sent: Thursday, August 30, 2001 10:53 AM
Subject: Re: stability of pitch raises


>
>
> Tvak@AOL.COM wrote:
>
> > .........I suppose it's possible that the
> > piano did all its drifting in the first 3 months, and just stayed there,
but
> > I'm starting to wonder about the conventional wisdom that a pitch-raised
> > tuning is less stable.
> >
>
> You wont be the first to wonder about this...
>
> > Could it be that the use of the RCT negates the instability issue by
virtue
> > of getting the piano so close to pitch after the first pass?
>
> Doubtfull, at least not more then any reasonably well done pitch raise is
capable
> of. I think there are a lot of variables here that get into the picture to
some
> degree or another. Different pianos, condition, local climate, and age
among some
> of the more important ones.
>
> I have always felt, and personal observation seems to bear this out, that
a
> stable environment will result in a stable pitch raise every time.
>
> >
> >
> > Any thoughts?
> >
> > Tom Sivak
>
> --
> Richard Brekne
> RPT, N.P.T.F.
> Bergen, Norway
> mailto:rbrekne@broadpark.no
>