Yamaha U1 - spongy, lack of repetition...

[Jay Mercier]

Hi all,

Wow, great response here.  I'll get to work - then let you know what I find. 
  Could be a week or so.

Jay Mercier

>From: Clyde Hollinger <cedel@supernet.com>
>Reply-To: pianotech@ptg.org
>To: pianotech@ptg.org
>Subject: Re: Yamaha U1 - spongy, lack of repetition...
>Date: Tue, 05 Feb 2002 07:09:57 -0500
>
>I question the packing and grooving theory.  After all, the piano is three
>years old or less, and it's a Yamaha.  How likely is that?  But you may be
>right.
>
>Here's a long shot, but there's a small maybe that it will steer you in the
>right direction.  I had this feel in one single key a couple weeks ago.  A
>tiny screw had fallen behind the hammer flange and was obstructing its free
>motion.
>
>I am thinking that maybe something is causing an obstruction somewhere in 
>the
>action, but on a more widespread nature than the example I've just given.  
>For
>example, if the dampers have no play when the key is fully depressed (the
>damper wires bump against the hammer spring rail maybe?) it could cause 
>this
>feel.  I had that happen once, but it was an older piano, and the hammer
>spring rail was warped toward the damper wires.
>
>Regards,
>Clyde
>
>Keith Roberts wrote:
>
> > > Regulation looks good, very good & uniform.  There is only slight 
>excess
> > > lost motion.
> > >
> > > The symptons get better with left pedal depressed.
> >
> > You said it right there. The hammer rail felt has packed and the hammers
> > have grooved and the rail has settled so the strike distance needs to be
> > set. That's the first thing to check.
>




Jay Mercier
Associate member,
Twin Cities Chapter PTG
Glenwood, MN


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