questions, etc.

[Annie Grieshop]

Hey James,

That makes good sense and could certainly help explain what I've observed.
It also leads me to questions about soundboards that I'd forgotten I wanted
to ask:
*  What is the shape of the crown in a soundboard?
*  Where is "the crown", and what is its general shape/dimensions?

If it's a soundboard-adaptation issue, then the percentage of pitch change
should be relative to the shape of the crown.  Yes?  No?  Or am I making
absurdly reductive assumptions about soundboards and their behavior?

Does that connect with my observation that pitch drops are less stable than
pitch raises?

Thanks, as always!

Annie

> -----Original Message-----
> From: Pianoman [mailto:pianoman at accessus.net]
> Sent: Tuesday, February 06, 2007 1:41 PM
> To: annie at allthingspiano.com; Pianotech List
> Subject: Re: questions, etc.
>
>
> Hi Annie,
> 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..
> James
> James Grebe   Piano Tuning & Repair   Member of Master Piano Technicians.
> Registered Piano Technician of the Piano Technicians Guild for over 30
> years.   "Member of the Year" in 1989
> Creator of Handsome Hardwood Caster Cups, Piano Benches, Writing
> Instruments,Table Timepieces
>  (314) 608-4137   1526 Raspberry Lane   Arnold, MO 63010
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