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
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