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The overpull on the RCT is set according to a curve for every note on the
scale, from as little as 12% in most of the bass to as much as 38% in some
parts of the treble, with a major transition between the wound and plain
strings. Furthermore, RCT computes a trailing average of six notes,
which is calculated into the overpull percentage for each note, so that
anomalies do not skew the figure. The percentages can also be tweaked
for the technician's individual tuning style.
<p>The result is that pitch raises of up to 20 cents rarely require more
than touchup, and up to ten cents not even that. If there is a risk
of string breakage, I often use the fine tune mode to get it close to pitch
without overpull, then use the pitch raise mode as a final tuning.
<p>Paul S. Larudee
<p>DGPEAKE@AOL.COM wrote:
<blockquote TYPE=CITE><font face="arial,helvetica"><font size=-1>In a message
dated 12/2/00 12:23:06 PM Pacific Standard Time,</font></font>
<br><font face="arial,helvetica"><font size=-1>larudee@pacbell.net writes:</font></font>
<br>
<br>
<blockquote TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">
<p><font face="arial,helvetica"><font size=-1>Agreed, but there is a big
difference between having no problem and having</font></font>
<br><font face="arial,helvetica"><font size=-1>a pitch raise so accurate
that all it needs is a little touchup. Paul S.</font></font>
<br><font face="arial,helvetica"><font size=-1>Larudee</font></font>
<br><font face="arial,helvetica"><font size=-1>Richmond, CA DGPEAKE@AOL.COM
wrote:</font></font>
<blockquote TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px"><font face="arial,helvetica"><font size=-1>I
believe the overpull is 25% of the 2nd partial. Someone please correct</font></font>
<br><font face="arial,helvetica"><font size=-1>me</font></font>
<br><font face="Arial"><font color="#000000"><font size=-1>if I am wrong.
(Jim, please pitch in). The SAT 3 is the same. I usually</font></font></font>
<br><font face="Arial"><font color="#000000"><font size=-1>measure the
lowest note of the plain wire, offset for pitch raise, and</font></font></font>
<br><font face="Arial"><font color="#000000"><font size=-1>re-measure every
octave or so. I have no problems with doing a pitch raise</font></font></font>
<p><font face="Arial"><font color="#000000"><font size=-1>using this method.</font><font size=+0>
</font><font size=-1>Dave Peake, RPT</font></font></font>
<br><font face="Arial"><font color="#000000"><font size=-1>Portland Chapter</font></font></font>
<br><font face="Arial"><font color="#000000"><font size=-1>Oregon City,
OR</font></font></font>
<br><font face="Arial"><font color="#000000"><font size=-1>www.davespianoworks.locality.com</font></font></font></blockquote>
</blockquote>
<p><br><font face="Arial"><font color="#0F0F0F"><font size=-1>Really? 100%
of the time? Yes, sometimes it is so close that I hardly move</font></font></font>
<br><font face="Arial"><font color="#0F0F0F"><font size=-1>the pins. Other
times it is still a little flat or a little sharp.</font></font></font>
<p><font face="Arial"><font color="#000000"><font size=-1>Dave Peake, RPT</font></font></font>
<br><font face="Arial"><font color="#000000"><font size=-1>Portland Chapter</font></font></font>
<br><font face="Arial"><font color="#000000"><font size=-1>Oregon City,
OR</font></font></font>
<br><font face="Arial"><font color="#000000"><font size=-1>www.davespianoworks.locality.com</font></font></font></blockquote>
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