Zoe, You must tune your tuning fork. If the fork is flat, as in your case, you must take a metal file and file the tines of the fork very slightly to shorten them until it is vibrating at the proper frequency. If the fork is sharp, file the crotch of the fork to lengthen the tines. It is important to take the preparation step of having the tuning fork at the temperature that you intend to use it. Different folks use different methods. Some leave the fork in their pocket for five minutes, some under the arm, some lay it on the plate to let it achieve room temperature. I prefer some variant of the body temperature for calibration. Whatever you use, though, be consistent, both when you calibrate/tune your fork, and when you tune the A (or C?) of the piano. If your fork is too hot, it will be flat, too cold, sharp. Have fun! William R. Monroe On Mon, Dec 28, 2009 at 2:01 PM, Zoe Sandell <yiddishtangofever at shaw.ca>wrote: > Hello, > > I have just completed calibrating my tuning device with NIST and the > Tunelab > demo-. When I call back the C5 500Hz marks as in tune- ie squares stay > still- but my tuning fork reads flat at A440 > > How then do I accurately tune the temperament octave to the tuning fork- > knowing this discrepancy? Get a new/better tuning fork? > > Thanks > Zoe > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20091228/56905a21/attachment.htm>
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