chiffing attack sound in bass

[isaacah]

Robert,

I would soften the shoulders needling the flat side of the hammers. The idea
is to get the shoulders to move and absorb some of the impact.  I would try
to get some flexing from a bit below the shoulders (8 o-clock) right up to
11 o-clock on both sides leaving the outside untouched and needling from the
flat side with the needle going right through to the opposite side, doesn't
matter which side you go in from.
----- Original Message -----
From: "Robert Bussell" <rbussell@iquest.net>
To: <caut@ptg.org>
Sent: Friday, February 21, 2003 8:15 AM
Subject: chiffing attack sound in bass


> I have been asked by a pianist to voice out an attack sound she hears in
> the bass. The best that I can describe the sound is that it is like the
> chiff a pipe organ makes with the note starts.  I have heard this sound
> many times before in other pianos of different makes but have never been
> able to solve the problem.  This is the first time that  a pianist has
> brought it up.  It is not string leveling or hammer to string mating,
shank
> and hammer glue joints are good,  pinning is good, shape of hammer looks
> good.  I have tried switching out the hammer and shank with other notes
> that don't have the sound and it follows the hammer.  Another technician
> suggested that the hammer has been over voiced and to use a couple drops
of
> acetone and keytop on the strike point.  This gets rid of the chiff sound
> but then to note is too bright.  When I lightly file off the crust and
> needle the surface to even out brightness the sound returns.  I would
> appreciate any suggestions.
>
> Bob Bussell
>
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