Tension Difference between 435cps and 440cps

[Delwin D Fandrich]

----- Original Message -----
From: "Farrell" <mfarrel2@tampabay.rr.com>
To: <pianotech@ptg.org>
Sent: September 18, 2001 2:15 PM
Subject: Re: Tension Difference between 435cps and 440cps


> Are you saying to rescale with A440 in mind, but keeping all tensions
close
> to that of the original design? That would mean using slightly thinner
wire
> for each respective note?
>
> Terry Farrell
>

A really good rule of thumb here--if you have any reservations at all about
the structure of the piano, whether it be square, triangular or rectangular,
analyze the original scale as if it were tuned to A=440 (because sooner or
later it will be no matter what it says on the plate) and rescale dropping
the overall tension by 5% to 10% (depending on your evaluation of the plate
and structure. Make sure you don't have the tensions of any one section any
higher than they were originally.

Who knows--it might even sound better at the lower overall tension.

Del