"Bobbling" hammers on a new Yamaha U3. ( Please help! )

[Greg Newell]

Cy,
         I'm entering this late but, is there a chance that the jack is 
dragging on the let off rail. If the rail is too close this can happen as 
the jack pops out from under the butt.

Greg Newell



At 04:04 PM 4/13/2004, you wrote:
>I had the same problem with my 1982 U1.  I had broken hammer spring cords,
>fixed them, and still had the problem.  It's on soft play, especially when
>your fingers move up the tail of the key (as in "Moonlight Sonata", where
>you're in C minor, and don't have much choice of where to play the E).  I've
>shimmed the balance rail to no help.  Key dip is right.
>
>It's just some notes in the middle.  I wonder if it's a warped key bed or
>something like that?
>
>--Cy Shuster--
>Rochester, MN
>
>----- Original Message -----
>From: "pianolover 88" <pianolover88@hotmail.com>
>To: <pianotech@ptg.org>
>Sent: Tuesday, April 13, 2004 12:20 PM
>Subject: Re: "Bobbling" hammers on a new Yamaha U3. ( Please help! )
>
>
> > Of course, the U3 you're working with is apparently new, but I encountered
> > the same "Multi" striking problem on a U3; but it was about 30 years
>older.
> > The reason: Broken hammer butt spring cords, in addition to needing many
> > points of regulation, including backchecks too far from catchers. But then
> > again, sometimes the hammer butt spring simply gets disengaged from the
> > cord, causing bubbling.
> >
> > Terry Peterson
>
>
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Greg Newell
Greg's piano Forté
mailto:gnewell@ameritech.net