Alan and David on F3/A4

[Joe And Penny Goss]

Hi, I am assuming that the piano is at least close to pitch and not 100
cents low <O(:
Joe Goss RPT
Mother Goose Tools
imatunr@srvinet.com
www.mothergoosetools.com
----- Original Message ----- 
From: "Alan Barnard" <tune4u@earthlink.net>
To: "ed440@mindspring.com, Pianotech" <pianotech@ptg.org>
Sent: Monday, January 09, 2006 8:44 AM
Subject: RE: Alan and David on F3/A4


> Glad to help, but please post this slightly corrected version. I got out
> the ol' Coleman Beat Locator cards and found a couple of corrections to
> make:
>
> When you tune with a fork, electronic or otherwise, you are tuning A4 to
> the fundamental of that fork, i.e., 440 bps.
>
> F2 works for the test because the 5th partial of F2 is A4, where it
> coincides with the fundamental of the fork.
>
> B1 works because the 7th partial of B1 is A4, where it likewise coincides
> with the fundamental of the fork.
>
> F3 is a poor choice because it has no partial at A4! It has a 5th partial
> that coincides with A5 which is, of course the 2nd partial of A4.
>
> So if F3 is used, the beats that you are counting are at A440 (the fork)
> and A880+, i.e., the inharmonic 2nd partial of A4.
>
> Therefore, if you very accurately match the beat rates of F3-Fork and
> F3-A4, you will tune A4 sharp every single time!
>
> The Yamaha example doesn't really bear on this discussion because they are
> talking about an altogether different approach (and shouldn't the #1
> example be tuning A49 instead of A47?). F3 is only mentioned in relation
to
> the 3rd-10th test of the octave, which is only to ensure that you have the
> A3-A4 octave expanded, or at least not contracted, which has nothing to do
> with the dead-on-ness of A4 at 440 bps.
>
> Here is another logical way of seeing this. When we tune an interval 5th,
> we are comparing a 3rd partial to a 2nd partial. Likewise, when tuning an
> interval 4th, we are comparing a 4th partial to a 3rd partial. In the case
> of setting A4 to the fork, we are tuning a UNISON where the interval
ration
> is 1:1 and we must, therefore, compare beat rates arising from the exact
> same partial. Because the fork is only sounding (for all practical
> purposes) at its fundamental, we must use comparison intervals that have a
> coincident partial at A4. Hence B1 or F2.
>
> But not F3; it has no coincident partial at A4.
>
> Alan Barnard
> Salem, Missouri
>
>
> > [Original Message]
> > From: <ed440@mindspring.com>
> > To: <pianotech@ptg.org>
> > Date: 01/09/2006 6:58:13 AM
> > Subject: Alan and David on F3/A4
> >
> > Alan Barnard and David Renaud:
> >
> > Your posts on this topic are beautifully written.
> > Thank you.
> > I hope you don't mind if I repost them to ExamPrep.
> >
> > Ed Sutton
> > _______________________________________________
> > pianotech list info: https://www.moypiano.com/resources/#archives
>
>
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