String noises revisited

[paulrevenkojones at aol.com]

 Bob:

Why replace them. The inside profile of all agraffes, including new ones, is a "mesa" shaped termination which needs to be reshaped into a proper curved profile. The old agraffes are still good; why pay for new ones that need the same treatment?

By the way, we are currently beginning an experimental process to (no pun intended) determine the tonal differences (more or less transient noise like this shimmer) between flat inner profile and curved inner profile agraffes. I'll let you know. 

Paul


 


 

-----Original Message-----
From: BobDavis88 at aol.com
To: pianotech at ptg.org
Sent: Thu, 10 Jul 2008 12:33 am
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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