On Tue, 14 May 1996 jpiesik@arinc.com wrote: > Can anyone help me with a damper problem? > > The piano is a 1991 Schafer and Son 4'7" grand. The first two bi-chord > notes in the bass scale (C2 and C#2) continue to sustain after the > dampers have settled onto the strings. > > The dampers are in perfect alignment in all dimensions. There is plenty > of damper follow. There is nothing binding in the back action. The > damper wires move freely through the guide rail. The felt wedges are > rather wide at the point and settle very near the top of the bi-chord > strings; however, they look similar to all the other bi-chord wedges. > The sustaining sound is definitely coming from C2 and C#2 and is not a > sympathetic vibration from somewhere else. It seems like the dampers > are coming down at a node on the strings because the sustaining sound > appears to be a partial or harmonic of the fundamental. > > Do I need to needle the damper felt? Is this a job for damper pliers? > Do the dampers require some modification? Would more weight on the > underlever help? Is this a design flaw the customer must live with? > Any help is greatly appreciated!! > > John Piesik > San Diego Chapter PTG > JPIESIK@ARINC.COM > > John, I have always been told to do whatever it takes to stop the string from speaking. Needleing if you have to. The 2nd to the last thing would be replace damper felt and the last thing would be add weight to the underlever. Just as long as you can stop the string fron speaking. Good Luck, Clark Hale
This PTG archive page provided courtesy of Moy Piano Service, LLC