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<DIV><SPAN class=375353706-12072005><FONT face=Arial color=#0000ff =
size=2>I
mentioned the plastic jacks because it was the only difference that I =
could see.
I don't see why they would make any difference either, though I have not =
actually taken one out and held it side-by-side a wooden
one.</FONT></SPAN></DIV>
<DIV><SPAN class=375353706-12072005><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=375353706-12072005><FONT face=Arial color=#0000ff =
size=2>Loose hammer flanges sounds like a real likely culprit. =
How many
times have we checked the pinning on a brand-new hammer flange only to =
see eight
or ten swings? Since this is dealer prep I think I was actually avoiding =
that as
a possibility. However, now that it's been suggested as a possible
solution I can take that back to the dealer and find out how =
much they
want to invest. </FONT></SPAN></DIV>
<DIV><SPAN class=375353706-12072005><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=375353706-12072005><FONT face=Arial color=#0000ff =
size=2>Springs will be the test after that. All I need to do is slip =
it out from
under the loop and stretch it out a bit, right?</FONT></SPAN></DIV>
<DIV><SPAN class=375353706-12072005><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=375353706-12072005><FONT face=Arial color=#0000ff =
size=2>--
Geoff</FONT></SPAN></DIV>
<DIV><SPAN class=375353706-12072005><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>Susan Kline<BR><B>Sent:</B> Monday, July 11, 2005 11:29 =
PM<BR><B>To:</B>
Pianotech<BR><B>Subject:</B> Re: Mysterious unsolvable Yamaha =
double-striking
uprights<BR><BR></FONT></DIV>Interesting about the plastic jacks, =
though I
don't see what difference it would make. <BR><BR>For some kind of =
relief, you
might try repinning the hammer flanges firmer. Also make sure there =
isn't a
rail set up to stop the motion of the jacks too soon. <BR><BR>If it's =
still
driving you crazy, you might widen the letoff a hair, and maybe =
strengthen the
hammer springs a little bit. <BR><BR>Good luck - I've seen this on =
Yamaha big
uprights and also on Kawai big uprights, though not all of them, or =
this bad.
For some reason, I haven't found it on consoles or short uprights. =
Maybe I
just didn't look ... <BR><BR>Susan<BR><BR>At 11:04 PM 7/11/2005 -0700, =
you
wrote:<BR>
<BLOCKQUOTE class=cite cite="" type="cite"><FONT face=arial =
size=2>Greetings
--</FONT><BR> <BR><FONT face=arial size=2>I did a dealer =
prep on a
brand new, fresh out-of-the-box, Yamaha MX500 P upright today. Every =
single
note double-struck when played softly. I checked regulation and had =
to
adjust lost motion on every key. Let-off also needed to be adjusted, =
but
only on about 10 keys. When I finished these two adjustments the =
regulation
may not have been perfect but it was certainly close enough. Still, =
every
single note was double striking when played softly. (Definition of =
"softly":
Playing the note faster then when you are checking let-off but =
slower than
it takes to actually check.)</FONT><BR> <BR><FONT face=arial
size=2>What I am witnessing is this: When I play the note, just =
before the
jack releases from under the butt the hammer jumps off the jack =
prematurely
and strikes the string. After striking the string the hammer then =
bounces
back onto the jack, which is still in it's pre-release position. =
Continuing
through the keystroke results in the hammer striking the note a =
second time
as the jack finally releases from under the butt. =
</FONT><BR> <BR><FONT
face=arial size=2>This was something new to the store manager so =
I called an
associate. He suggested I go through the routine I had just =
completed, but
otherwise could offer no further suggestion. OK, so I decided to =
tune the
thing while I pondered the matter further. =
</FONT><BR> <BR><FONT
face=arial size=2>Aha! Tuning finished. Let's see what the other =
Yamaha
uprights are doing. I checked six other, (not used), Yamaha uprights =
on the
floor, (none of which I had prepped, but all of them allegedly =
prepped), and
every single one of them exhibited the same double-strike behavior. =
For
comparison I then checked some NON Yamaha uprights and they all =
behaved
properly. I finally checked the showroom Yamaha action model, and =
it, too,
was behaving correctly. BUT... It was then that I noticed that all =
the
Yamahas used in this test had plastic jacks. The Yamaha action =
model, as
well as the non-Yamaha uprights used in this test, all had wooden =
jacks.
</FONT><BR> <BR><FONT face=arial size=2>That's all the =
clues I have.
Anybody have any idea what's going on, and what can be done to =
correct
it?</FONT><BR> <BR><FONT face=arial size=2>Geoff =
Sykes</FONT><BR><FONT
face=arial size=2>Assoc. Los Angeles
Chapter</FONT></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>