stability of pitch raises

[Joe & Penny Goss]

Hi Paul,
In using a SATlll
I rarely start from A0 anymore like I use to.
Depending on the flatness of the piano and if it is mostly flat on the plane
wires.
Pianos that are evenly flat will get the A0 treatment.
 But most often, after setting the FAC. I will start at the first plain
string and tune to the top, checking at the break and if it is much flatter
when I get there I will use the 33% overshoot from just before the break say
at a C5  to the top. Returning to the bass and  tune going down to the A0.
Having had a lot of pianos end up with the top bass strings sharp due to too
much overpull,when going from A0 to the top, I started measuring the A2 and
using the 25%   overpull then starting on A0 tune to the the tenor break
before resetting the overpull.
The construction of the piano makes a huge difference in how much
overpulling it will need
The heavier the plate or large beams the less need for the 33%
Joe Goss
imatunr@srvinet.com
www.mothergoosetools.com
----- Original Message -----
From: "Paul Tizzard" <ptizzard@mweb.co.za>
To: <pianotech@ptg.org>
Sent: Saturday, September 01, 2001 4:33 PM
Subject: Re: stability of pitch raises


> Hi list
>
> I also thought I had seen something Al Sanderson had written about
starting
> a pitch raise from A0, and continuing onward and upward chromatically. I
had
> always started pitch raise's with setting a temperament, and tuning as per
> normal as quickly as possible. Obviously the only way to do the chromatic
> pitch raise is with an ETD. Can anyone expand on the chromatic technique?
>
> If one starts at A0, you're adding whatever extra "tension" there
> would be that occurs from a pitch raise, to the "middle" of the soundboard
> first? If I'm correct in assuming that, would that have any effect on the
> outcome of the tuning? Also, one is adding tension to the frame in a
> different sequence to the way you would starting with the temperament.
This
> should also have an effect?
>
> I mentioned this to an RPT ( the only one in the area ), and he said he
> hadn't heard of doing a pitch raise like this, which made me think I had
> misunderstood what I had read.
>
> Any comments would be appreciated.
>
> Paul Tizzard, Piano Tuner
> Cape Town
> South Africa
>
> ----- Original Message -----
> From: "Z! Reinhardt" <diskladame@provide.net>
> To: "Pianotech" <pianotech@ptg.org>
> Sent: Friday, August 31, 2001 12:22 AM
> Subject: Re: stability of pitch raises
>
>
> > One person you might want to talk to is Doc Sanderson (Dr SAT himself)
at
> > Inventronics.  He has done research on the effects of doing a pitch
raise
> > "piecemeal" (start with a temperament, tune single strings, then pull in
> > unisons) versus "brute force" (crank all pins from one end of the piano
to
> > the other).  If I remember correctly, he has found that the "brute
force"
> > method [my terminology] results in more stable tuning at pitch using a
> > smaller overpull than would be necessary to do a "piecemeal" pitch
raise.
> > He may have an explanation for this phenomenon.
>
>
>
>