bobbling hammers-1993 Kranich&Bach

[Lance Lafargue]

John,
This makes a lot of sense on this one.  I will check it out.  When you play
it the point of let-off has a lot of resistance and that is why it is
sometimes unnatural to continue down to the bottom of the keystroke.  Under
normal play, many notes sound without getting to the bottom of the front
punching.  Thanks.  I'll let you know.  
Lance Lafargue, RPT
New Orleans Chapter
Covington, LA.
lafargue@iamerica.net

----------
> From: John McKone <mckonejw@SKYPOINT.COM>
> To: pianotech@ptg.org
> Subject: Re: bobbling hammers-1993 Kranich&Bach
> Date: Monday, February 02, 1998 7:13 PM
> 
> Lance,
> 
> I don't about the K&B you're working on, but one thing that seems to
> contribute to this problem on Yamaha's (particularly the P22) is the
> relationship between let-off and damper lift.
> 
> These pianos sometimes are set up so that the let-off button and the
damper
> spoon are contacted simultaneously.  This produces enough friction to
> create a "false bottom" to the key stroke, particularly on a soft blow.
> The "false bottom" causes enough hesitation in the key to allow a bobble
> before the jack can get through let-off.
> 
> 
> John Mckone, RPT
> 
> >Dear List,
> >I GIVE UP!  I've been trying to help a customer of mine who bought a
cheap
> >Kranich & Bach (made in Europe, 1993, sold by Baldwin) 42" upright. 
This
> >piano had double striking or bobbling hammers when I first saw it.  To
be
> >brief and to the point; I added let-off distance and dip, still some
> >bobbling on soft blows, added more, still bobbling at times, then I
added
> >key height/dip, adjusted checking, and unless you are VERY deliberate
and
> >get to the very end of each key stroke, IT STILL DOES IT occasionally.
> >Maker won't help, they said (basically) that's what you get for buying a
> >cheap piano.  Now, the piano is no fun to play and you still get the
> >occasional bobble if you're not careful.
> >
> >I have come across this problem hundreds of times over the years and
have
> >always been able to regulate it out, but I can't seem to get this one to
> >stop without regulating it out of the comfort zone.  I remember some
> >Samicks and Yamahas in the low tenor had this problem due to the angle
of
> >the surface on the butt where the jack contacts.  Any ideas?  Thanks
very
> >much!
> >Lance Lafargue, RPT
> >New Orleans Chapter
> >Covington, LA.
> >lafargue@iamerica.net
> 
> John McKone, RPT
> St. louis Park, Minnesota
> (612) 280-8375
> mckonejw@skypoint.com
> 
> 
> 
>