Bosendorfer dampers

[David ilvedson]

Also in the future...consider making a test with "one" damper.  
Mute off all the strings and change one especially problem 
damper felt and see what happens.  

David Ilvedson, RPT


Date sent:      	Fri, 26 Mar 1999 21:04:39 -0500
From:           	nhunt@jagat.com (Newton Hunt)
To:             	pianotech@ptg.org
Subject:        	Re: Bosendorfer dampers
Send reply to:  	pianotech@ptg.org

> I would suggest two things before doing anything drastic.
> 
> 1.  Pluck each string to see if one or more is better muted than the
> others.  If the outside strings are more open than the inside string
> then it is likely that the cuts in the felt are not deep enough to
> allow the wedging effect needed for effective dampening.  Use a very
> sharp blade and cut the felt in the center deeper.
> 
> 2.  If one string is more open than the other two then the one wedge
> is thicker than the other and will need to be thinned with pliers to
> make them match and mute.
> 
> Trim a little off the length of the wedges so they do not bow the
> strings on their way up.  Cut at a slight angle to the inside to
> provide an open wedge which allows the felt to guide itself down
> between the strings easily.
> 
> Lightly tap the front and the back of the damper and see if one moves
> down more than the other and bend the wire at the block to adjust
> this.
> 
> The quality of the felt is critical to it's functioning well.
> 
> Make certain there is not sluggishness in the damper levers and that
> the damper wire moves freely in the guide bushings and that the wire
> is not binding in the bushing.
> 
> Also make certain the damper lever is not touching anything when it is
> at rest, like another damper lever or the lift tray.
> 
> Hope this is helpful.
> 
> 		Newton Hunt
> 		New Jersey USA
> 


David Ilvedson, RPT
Pacifica, CA
ilvey@jps.net