tuning instability/plate struts

[Phil Frankenberg]

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It's always been my impression that tuning instability around the lower =
tenor(treble bridge) is due to the soundboard expansion and contraction =
caused by changes in humidity. That this area of the board is sort of a =
peak. Anyone care to illuminate me. It's a dark and foggy day here.

Phil Frankenberg
CSUC Chico, Ca.


----- Original Message -----=20
  From: Tvak@aol.com=20
  To: pianotech@ptg.org=20
  Sent: Saturday, January 17, 2004 12:17 PM
  Subject: tuning instability/plate struts


  List

  Certainly I think we can agree that strings near the plate struts go =
out of tune more than those in the center of their sections.  And when =
it comes to the tenor break, I think I can understand why this would =
happen.  The treble bridge ends there, often the stringing scale goes to =
copper-wound strings for the last couple of unisons and I imagine the =
tension of those strings differs from their steel neighbors.  And right =
on the other side of the break, the strings are strung across in another =
direction; all of those things could probably contribute to instability, =
although I say this not out of knowledge of the situation, but just =
looking at it in a logical (but basically uninformed) way.

  But why does this also happen in the treble break?  Often there's one =
continuous bridge.  Steel strings on both sides.  All strung parallel.  =
And yet notes on either side of this break generally go out quicker and =
farther.

  Why should those strings be less stable? =20

  Tom Sivak 
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