String noises revisited

[Kerry]

What was the difference? And was it consistent in all the agraffes?

 

 

Kerry Kean

Kent, Ohio

 

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From: BobDavis88 at aol.com [mailto:BobDavis88 at aol.com] 
Sent: Thursday, July 10, 2008 1:33 AM
To: pianotech at ptg.org
Subject: String noises revisited

 

 

 

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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