[pianotech] A432 Tuning Fork

[J Patrick Draine]

Wim,
Check your math! 6 cents FLAT of A-440 would be roughly 438.5 cps. (if it
was PLUS 6 cents it would be 441.5 cps).
Patrick (no math wiz) Draine

On Wed, Jan 19, 2011 at 1:24 PM, <tnrwim at aol.com> wrote:

> Jim
>
> An A fork that is 6 cents low is not at A432. At A, there are four cents
> per beat. So a fork that is 6 cents flat is at A442.5. It shouldn't take
> much to file throat of the fork to reach 440.
>
> Wim
>
>
>
> -----Original Message-----
> From: James Sasso <jwsasso at gmail.com>
> To: pianotech <pianotech at ptg.org>
> Sent: Wed, Jan 19, 2011 6:11 am
> Subject: [pianotech] A432 Tuning Fork
>
> Hello Everyone;
> I just bought a John Walker tuning fork from Schaff in preparation for my
> tuning exam. All electronic instruments indicate this fork is 6-8 cents flat
> at room temperature.  I'd like to get some feedback as to options. My other
> forks average average to within 2 cents of C5 and A4 but the A4 one is
> aluminum. I was thinking of keeping and filing the John Walker fork, but
> wouldn't 6-8 cents require an awful lot of filing and mutilation of the
> fork? Another option would be to return the current one and ask Schaff to
> send one closer to A440. A final option I've considered is to purchase a
> Sanderson Accu-fork ($165 Pianotek). Any comments would be appreciated.
> Thanks,
> Jim
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ptg.org/pipermail/pianotech.php/attachments/20110119/c2d30e6b/attachment.htm>