False Beats in high treble after stringing

[Paul McCloud]

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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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