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<DIV><FONT face=Arial size=2>Doesn't sound right. When doing the PR, are you
using an ETD? Unisons as you go? 41% is very large percentage for overpull. Most
ETDs recommend between 20% and 35%, depending on the area of the
scale.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Immediately after the PR, do you check the middle
section for pitch? If it is at or near target, there is no reason for it to
creek up. How large a pitch gain are you talking about? I've never noticed such
a phenomena.</FONT></DIV>
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<DIV><FONT face=Arial size=2>Terry Farrell</FONT></DIV>
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<DIV><SPAN class=114315606-07072006><FONT face=Arial size=4>
I do many many many pitch raises -- almost every piano I tune, for the last 27
years. (Almost everybody lets them go too long.)</FONT></SPAN></DIV>
<DIV><SPAN class=114315606-07072006><FONT face=Arial size=4>
I've found that the ideal average overpull is halfway between 1/3 to 1/2 the
amount sharp as it was flat. In other words, a 41% overpull of the
amount it was</FONT></SPAN><FONT face=Arial><FONT size=4><SPAN
class=114315606-07072006><FONT size=+0> flat. For an easy-figuring
example, say the piano is 18 cents flat. Half of that is 9 cents and a
third of that is 6 cents. Half-way between 6 and 9 is 7.5, so I pull it
7.5 cents sharp, and almost invariably A4 ends up right on 440 Hz, or very
close. </FONT></SPAN></FONT></FONT></DIV>
<DIV><SPAN class=114315606-07072006> <FONT face=Arial
size=4>However, if the piano is a half-step flat, I don't pull it 41
cents sharp. That would be too much. There's some degree of
flatness where the usually-id</FONT></SPAN><SPAN
class=114315606-07072006><FONT face=Arial size=4>eal 41% overpull has to taper
off. For a half-step pitch raise, I usually overpull so that A4 is
beating about 5 beats sharp. That's approximately 20 cents, I
believe. Sometimes more is required, sometimes less. It
varies. That's here in Denver -- probably different elsewhere.
</FONT></SPAN></DIV>
<DIV><SPAN class=114315606-07072006><FONT face=Arial
size=4> But what I often experience is: even
though after the pitch raise, A</FONT></SPAN><SPAN
class=114315606-07072006><FONT face=Arial size=4>4 is at 440; after I've
gone through the fine tuning and
</FONT></SPAN><SPAN class=114315606-07072006><FONT
face=Arial size=4> pulled in unisons, when I go back to do the final check and
touch up anything that has slipped, I find that the whole middle section
is sharp! Why?</FONT></SPAN></DIV>
<DIV><SPAN class=114315606-07072006><FONT face=Arial
size=4> --David Nereson, RPT</FONT></SPAN></DIV>
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