False Beats in high treble after stringing

[Dave Smith]

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Re: False Beats in high treble after stringingThanks for the thoughts given so far.  I will attempt to achieve a "quiet mind" and then go after the false beats again in a more methodical manner.  

Dave Smith
SW FL
PTG Associate

  ----- Original Message ----- 
  From: Paul McCloud 
  To: 'Pianotech' 
  Sent: Tuesday, June 10, 2003 10:20 AM
  Subject: RE: False Beats in high treble after stringing


  You might check to see how much downbearing there is over the bridge.  A rocker gauge may not show it, but a bubble gauge or other more sophisticated tool will.  It's likely that there isn't much downbearing in that area.  I rebuilt a Ste. M some time ago, and was similarly disappointed with the result, with all the false beats and such.  I used CA instead of your epoxy, but did all the same things to get rid of the false beats, to no avail.  When I used my Lowell gauge to check that area, there wasn't much downbearing at all.  I had to let it go at that.  FWIW.

              Paul McCloud

              San Diego





  -----Original Message-----
  From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of Keith McGavern
  Sent: Tuesday, June 10, 2003 6:07 AM
  To: Pianotech
  Subject: Re: False Beats in high treble after stringing



  At 9:09 PM -0400 6/9/03, Dave Smith wrote:

    ... Can anyone offer me advice on what to do next to reduce the false beats, short of unstringing and recapping bridge, etc?  I would appreciate your help!



  Dave,



  I am no expert in this area, but will offer some thoughts has to how I would attempt to troubleshoot this matter in my mind.



  To hopefully discover the cause:

  1) pick the worst offender

  2) mute the non-speaking sections of that offender, listen.

  3) if false beat still there, determine that there is side and down bearing

  4) if there is, determine that the string equally leaves the both the bridge pin and the bridge

  5) if it does, determine that there is absolutely no movement in the bridge pin

  6) if all these prove to be okay and the false beat has not dissipated, the way the string contacts the pressure bar is certainly a possibility for inducing a false beat.

  7) And if after verifying all these conditions are as they should be, replacing the string is another option.



  You might not be able to eliminate all of the false beats, but it is very possible they can be blended so that no one false beat stands out above the others. When tuning pianos in the field, blending is utilized by me quite often to mask inherent discrepancies that will never be properly addressed.



  These are my thoughts on the matter, Dave, on chasing down the worst offending false beat situation.



  Rest easy in this matter. Frustration in not the master, you are.



  Keith McGavern


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