<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; =
charset=us-ascii">
<TITLE>Message</TITLE>
<META content="MSHTML 6.00.2900.2769" name=GENERATOR></HEAD>
<BODY>
<DIV><SPAN class=500552218-02112005><FONT face=Arial color=#0000ff =
size=2>I
brought this same question up a month or so ago. I still experience this =
phenomenon on almost every new, or not too old, Yamaha upright. The =
response I
received here indicated that this wasn't so much a manufacturing =
problem or
a regulation problem as it was a leftover artifact from =
a design
change to take care of something else. The consensus here was that =
the
double-striking occurs when the key is pressed slower than would =
normally occur
during actual play. Such as when setting let-off. In other words, yes =
the
double-strike is there, but it happens outside the window of normal =
playing
dynamics. It is therefore to be considered within the acceptable, (if =
not a
little annoying), range of performance. I've learned to ignore it under =
these
circumstances.</FONT></SPAN></DIV>
<DIV><SPAN class=500552218-02112005><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=500552218-02112005><FONT face=Arial color=#0000ff =
size=2>--
Geoff Sykes</FONT></SPAN></DIV>
<DIV><SPAN class=500552218-02112005><FONT face=Arial color=#0000ff =
size=2>--
Assoc. Los Angeles</FONT></SPAN></DIV>
<DIV><SPAN class=500552218-02112005><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=500552218-02112005><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr =
align=left><FONT
face=Tahoma size=2>-----Original Message-----<BR><B>From:</B>
pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] <B>On =
Behalf Of
</B>Annie Grieshop<BR><B>Sent:</B> Tuesday, November 01, 2005 6:01
PM<BR><B>To:</B> Pianotech<BR><B>Subject:</B> Yamaha jumping
jacks<BR><BR></FONT></DIV>
<DIV><SPAN class=312035601-02112005><FONT face="Comic Sans MS" =
size=2>Good
evening,</FONT></SPAN></DIV>
<DIV><SPAN class=312035601-02112005><FONT face="Comic Sans MS"
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=312035601-02112005><FONT face="Comic Sans MS" =
size=2>I had
two tuning jobs yesterday that involved relatively new Yamaha =
verticals - an
M500 and an M450. Both have very jumpy jacks (or, at least, =
that's my
analysis of why they're tending to double-strike, even when =
well-regulated),
and I'm wondering why. </FONT></SPAN></DIV>
<DIV><SPAN class=312035601-02112005><FONT face="Comic Sans MS"
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=312035601-02112005><FONT face="Comic Sans MS" =
size=2>Both
have plastic jacks and synthetic buckskin. The M500 had been =
treated
with something that looked graphite-like and was less jumpy than =
the
M450, which leads me to believe that the proper lubricant (or other =
treatment)
might solve the problem. I would very much appreciate any =
suggestions as
to how to proceed. Thanks!</FONT></SPAN></DIV>
<DIV><SPAN class=312035601-02112005><FONT face="Comic Sans MS"
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=312035601-02112005><FONT face="Comic Sans MS" =
size=2>Annie
Grieshop</FONT></SPAN></DIV>
<DIV><SPAN class=312035601-02112005><FONT face="Comic Sans MS" =
size=2>in the
wilds of balmy Ioway, where winter is still in our
future.....</FONT></SPAN></DIV></BLOCKQUOTE></BODY></HTML>