[pianotech] A432 Tuning Fork

[Jim Moy]

On Thu, Jan 20, 2011 at 10:43 AM, Roge Domeny <rogerdomeny at att.net> wrote:
> ...Tests that rely on higher partials of A49 will
> not be accurate because the inharmonicity that is present in the piano will
> not be matched by the pitch source.

In general I agree with this, as it can be a source of confusion.

However, in the article I referenced, what Jim Coleman showed was that
over a broad set of piano brands and sizes (perhaps more diverse than
what will be encountered on the tuning exam?), the inharmonicity while
varying can be predicted to fall within a reasonably sized window.
That window, combined with the increased accuracy of listening at a
higher partial, leads to a very good method for setting pitch.

Before I took the exam I was confident in my preparation using the
traditional F2 method. However, with only a little bit of practice, I
found I was quickly more *comfortable* and *faster* using the 3rd
partial method. These days, on the job, I mostly set pitch with
Tunelab. But I still carry my SQ-50 and a Johnny Walker, for backup,
and for variety.

I do think it is a bit controversial, judging by some of the
discussions I've had (in particular, with respect to the unpredictable
inharmonicity values). So maybe enthusiasm for the technique takes a
bit of a renegade streak :-)

Jim Moy