String noises revisited

[BobDavis88 at aol.com]

Allen Wright writes:

Has anyone  working on Hamburg Steinway B's (or similar instruments)  
encountered  shimmery high partial noises (quite noticeable) at the  
level of 4  octaves up (perhaps at the major seventh pitch or  
thereabouts), in  the area around E3 in the plain wire tenors? Perhaps  
half dozen  notes stand out like this....
Allen, I'm still thinking about this, and, although I don't know if it  
relates to the Hamburg pianos, there was a run of New York pianos in the  seventies 
that had a poor agraffe profile. That is to say, the shape of the  inside of 
the agraffe did not make a good termination. I have a couple of D's  that 
exhibit this in the tenor. We restrung one, changing the agraffes, and  it really 
cleared up the high metallic whistle. Inspecting the old and new  agraffes 
under magnification really showed up the difference.
 
On the other D, increasing the draft angle slightly by putting a  center pin 
under the string (on the counterbearing felt) made a big improvement,  
although we'll still eventually want to replace the agraffes.
 
Let us know when you find out for sure what it is.
 
Bob Davis



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