Yamaha jumping jacks

[Geoff Sykes]

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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.
=20
-- Geoff Sykes
-- Assoc. Los Angeles
=20
=20

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On =
Behalf
Of Annie Grieshop
Sent: Tuesday, November 01, 2005 6:01 PM
To: Pianotech
Subject: Yamaha jumping jacks


Good evening,
=20
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. =20
=20
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!
=20
Annie Grieshop
in the wilds of balmy Ioway, where winter is still in our future.....


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