[pianotech] Tuning Forks and their origin & calibration

[Tom Driscoll]

How bout' these?

http://www.onlinetuningfork.com/

http://www.seventhstring.com/tuningfork/tuningfork.html
  ----- Original Message ----- 
  From: Paul T Williams 
  To: pianotech at ptg.org 
  Cc: caut at ptg.org 
  Sent: Friday, January 21, 2011 5:07 PM
  Subject: Re: [pianotech] Tuning Forks and their origin & calibration


  OK...I'm warped on a Friday afternoon.   I took my fork and; and 64 degrees compared to the "phone dial", it is close to A440...a little flat. I warmed the fork for a few minutes in my pocket to probably A-440.5. My fork was flat as I first thought on the first try.  The second try was only a minute later, so probably not up to 68.5, so what a thing!  I think the phone dial is really at 440! (or very close to it). Susan, nice job! :>)  Do we really have nothing else to do ;>). What if someone walks into our shop while doing this crazy experiment?? Wow!  Nobody here while doing mine, thank, God!!....it's gotta look strange. 

  I don't have a calibration tool at the handy, but strange if this is so.....and why it is so... 

  It must be the government implanting frequencies in our brains!! lol 


  Nice to know. 

  Paul 



        From:  Rob McCall <rob at mccallpiano.com>  
        To:  pianotech at ptg.org  
        Date:  01/21/2011 03:48 PM  
        Subject:  Re: [pianotech] Tuning Forks and their origin & calibration 


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  WWV still exists although you won't get it on your AM radio station.  If you have a shortwave radio, you can find it at 5 10 or 15 Mhz on the dial.  So depending on the time of day, solar flares, and your location, you should be able to get one of those. What usually works for me is the higher the sun, the higher the frequency. 

  I believe they also have a phone number you can call to get the tones.  Don't quote me (unless I'm right :-)  ), but I think Tunelab uses this phone number to calibrate their program. 

  Regards, 

  Rob McCall 

  McCall Piano Service, LLC
  www.mccallpiano.com 
  Murrieta, CA 
  951-698-1875

  On Jan 20, 2011, at 20:48 , Bill Fritz wrote: 

  Well, I didn't quite find what I was looking for... but in the 1930/40's, the USA had a radio station (WWV) that actually added the output 440Hz for use in calibration. 
    



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