Thanks for all the input and suggestions. I don't understand the math of the beats vs. cents ratio although I would like to learn more about that. There must be some mathematical formula. The fork (warmed to room temperature) beat 19 times in seconds or about 2 beats per second. How does that translate into cents in the A440 range? The fork is stamped A440. The fork was compared to Tunelab (calibrated via phone) and other cheaper tuning devices and all were 6-8 cents flat (if those numbers on the right side of the box in Tunelab equal "cents"). I value the suggestion to return it--I'm too busy to experiment with filing an expensive fork that far from appropriate pitch. Jim, I like your quartz suggestion; can it be used for the tuning exam as it can't be visual, only aural? Jim -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20110120/29188ff8/attachment.htm>
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