Is A440 too much tension for old pianos? (was Old Bosie)

[Cy Shuster]

I'd like to know whether any pianos can't take the tension of A440 ("A435"
cast into the plate is a good sign, I understand)...

The complications I refer to are those during a pitch raise, where bringing
strings up to tension affects the pitch of strings you've already tuned.
Obviously you have to do two (or more) passes, but what's the best sequence
to get to stability fastest?  (I should have looked in the archives first).

--Cy--

----- Original Message ----- 
From: "Richard Brekne" <Richard.Brekne@grieg.uib.no>
To: "Pianotech" <pianotech@ptg.org>
Sent: Tuesday, January 06, 2004 8:54 AM
Subject: Re: Old Bosie


>
>
> Cy Shuster wrote:
> >
> > Is there really that much difference in cumulative string tension
between
> > A435 and A440?  (I know, I should do the math...)  I'm aware that A435
used
> > to be the standard.
> >
>
> There used to be lots of standards... and Vienna...where this instrument
> comes from has a history of dinking around with really high standard
> pitchs. At present the Vienna Symphony uses A444. When this piano was
> built pitchs around A453 were floating around. I dont know what the
> world record for the highest Apitch is ... but Vienna probably would
> hold it !
>
>
> > Also, since the treble strings have more tension than the bass, why does
> > tuning in order from A0 to C88 result in the least overall complications
> > when doing a pitch raise?
>
> What kind of complications are you refering too ? I think the idea
> behind that is that starting at one end and going to the other increases
> the tension from left to right (or right to left) which is supposed to
> be more predictable then starting in the middle, going up, and then
> going down... or around and around as it were. I also think there some
> room for discussion about the validity of the idea, and eventually just
> what is stretching what and how :)... usually is with these things.
>
>
> > (I read this in the TuneLab documentation).
> > Wouldn't you want to make the biggest tension adjustments first, and the
> > least last?
> >
> > --Cy Shuster--
> > Rochester, MN
> >
> >
>
> Cheers
> RicB
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