[pianotech] Was high and outside now silent pitch lowering

[paul bruesch]

Terry,

Which Sanderson do you use? With the SAT3 you only have the option of 25%
or 33(?)%.

In most pianos, for smaller pitch raises I hardly overpull the bass at all.
If it's a big PR (e.g. 40c-50c or more) even then 25% is too much in the
bass.  I find that the 33% overpull in the top two octaves or so is
oftentimes not enough. In order to compensate for these, I usually
compensate on the "Msr" by going more flat (treble) or less flat (bass)
before having it calculate the overpull. I re-"Msr" every C#, F, and A
(M3's)

I strip mute, A0 - C8, unisons (center, previous note right, current note
left, next note center, etc.) as I go... someday I'll get brave and try a
single mute. Maybe.

I've always been tempted to investigate this, but does it really overpull
that much at the very top? In other words, if I overpull C8 by 33%, what's
to pull it flat, besides the other two C8 strings? Or are the other two
strings enough to drag it back down?

Paul Bruesch
Stillwater, MN

On Tue, Oct 30, 2012 at 6:22 AM, Terry Farrell <mfarrel2 at tampabay.rr.com>wrote:

> I find it curious how folks find differing overpull percentages working
> for pitch raises. For me, I've settled on 16% in the bass, 28% in the tenor
> and 38% in the treble. Seems to work just about right on most any piano. I
> use the Sanderson method: A0 to C88, unisons as you go.
>
> Terry Farrell
>
> On Oct 30, 2012, at 12:44 AM, Cy Shuster wrote:
>
> > Good question! Answer is rarely.
> >
> > TuneLab has a safety limit for maximum overpull percentages. You tell it
> where the treble bridge starts, and you get one limit for the bass, another
> for the treble (slight differences between old Windows and new iOS/Android
> versions). I limit the bass to 10%, and treble to 25%.
> >
> > --Cy--
> >
> > Cy Shuster, RPT
> > Albuquerque, NM
>
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