PRs climbing sharper

[David Ilvedson]

Yeah, you've introduced a large amount of excess tension in the wire somewhere and it evens itself out over time...pitch goes up

David I.



----- Original message ---------------------------------------->
From: <Tvak@aol.com>
To: <pianotech@ptg.org>
Received: Tue, 29 Oct 2002 09:11:03 EST
Subject: PRs climbing sharper

>Here is something I've never seen mentioned in books or on the list but is a
>consistent phenomenon to my experience.  When I return to a piano which had a
>big pitch raise, I find that the piano is sharper than where I left it.  For
>instance, yesterday, I returned to a piano that I raised 6 months ago from
>100 cents flat to A438 and found it at A440.  You could explain that by
>factoring in the summer humidity in this case, but I find this to be true no
>matter what time of year.  Tune it in the fall, come back in the spring
>before the windows open up and it's still sharper than where it was tuned to.
> This phenomenon is so consistent that I now tune really flat pianos to A438.
> Otherwise, I play tag with A440 and have to lower the pitch on my return
>visit.

>This only happens after big pitch raises, of 35 cents or more.  I use RCT to
>pitch raise; whether it takes two passes or one, either way, my last pass is
>on a piano that is very close to the target pitch level.

>Comments?

>Tom Sivak
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