pitch lowering

[Alan R. Barnard]

Though it must have been a long time ago, I know I read something authoritative that said this issue had been studied by someone (Sanderson?) and it was demonstrated that all changes to system tension, torsion, etc., were instantaneous. I remember it because it certainly flew in the face of the conventional wisdom.
I think the article, or whatever it was, was on the topic of A0 to C88, bottom to top, over/under-pull pitch correction.
On the other hand, every time you move a piano it needs retuning, right?

Alan Barnard
Salem, MO
Joshua 24:15






Original message
From: "Joseph Garrett" 
To: pianotech 
Received: 02/06/2007 3:51:24 PM
Subject: Re: pitch lowering


My own theory on pitch raising and lowering has to do with the soundboard 
catching up with the pitch change in the wire. I believe the soundboard 
takes at least hours to conform to the new tension (whether higher or lower) 
and regardless of how much in one sitting you change the pitch to stabilize 
it will still change more because of the inability of the soundboard to 
adopt to the new tension level that quickly. That is why on pitch raises 
(over 25c) I come back in 2 weeks after to retune..
 
 
One should, also, take into consideration the de-compression of the plate and the rest of the structure. It is ALL connected, you know.<G>
 
 
Joe Garrett, R.P.T.
Captain of the Tool Police
Squares R I
 
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