tension change amount

[PNOTNR@aol.com]

I read the post asking what the difference is in tension when you raise the
pitch of a piano 1/2 step.  I've always wondered about this too.

Using Parson's PSCALE program, I was able to calculate the change in tension
on the original scale of a Mason & Hamlin Grand Model A, (original scale) from
42,821.65 lbs. at A440 to 38,093.73lbs. at A415 1/2 step lower.  This is a
change of 4727.92lbs. (or if I devide by 2.2 for difference in kilograms,
about 2149kg)

I don't know what kind of piano you were talking about, but with the PSCALE
program it's pretty easy to figure out.

Is that more info then you were after?!

Gordon Large, RPT
Maine