False Beats in high treble after stringing

[Greg Newell]

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Dave,
         Re-reading your original post, which you were kind enough to copy=
=20
in this reply to mine, I see that this piano is a grand. Before stringing=20
did you polish the capo d' astro bar? I certainly hope so. If not you could=
=20
try letting down the tension a wee bit and sliding the new strings from=20
side to side in an effort to lessen the effect of the grooves that were=20
worn into the underside of the bar from the old strings. If the problem is=
=20
in the agraffe section then you could try similar action or even replace a=
=20
few agraffes and re-string that part to see if the problem goes away. If=20
you sure that the problem is not at the bridge end this is the only contact=
=20
area left to look at. You could also try muting off the waste end of the=20
strings on both sides before attempting a new agraffe or two. Hope this=
 helps.

Greg Newell



At 12:03 AM 6/10/2003, you wrote:

>Greg, I am not sure of very much.  What do you suggest?
>
>Dave Smith SW FL
>----- Original Message -----
>From: <mailto:gnewell@ameritech.net>Greg Newell
>To: <mailto:pianotech@ptg.org>Pianotech
>Sent: Monday, June 09, 2003 11:52 PM
>Subject: Re: False Beats in high treble after stringing
>
>Dave,
>         Are you sure that the false beats are coming from the bridge end=
=20
> o the string?
>
>Greg Newell
>
>
>
>At 09:09 PM 6/9/2003, you wrote:
>
>>Just finished stringing my Wing and Sons upright piano project and have=20
>>quite a few false beats in the last two octaves of treble in single=20
>>strings.  My first restringing project.  Phil Bondi suggested that I ask=
=20
>>on-list for advice.  The treble bridge seemed (to me anyway) to be in=20
>>pretty good shape.  About 1/3 of the bridge pins were loose and I had=20
>>removed and replaced after putting epoxy on the ends of the pins.  Also a=
=20
>>little epoxy whereever there appeared to be any hints of small cracks=20
>>near the pins.    Great results, except in certain strings of the high=20
>>treble. Other than there, the piano sounds great.   I don't see anything=
=20
>>different about these strings or the bridge from other strings, but I=20
>>think I need to fix if possible.  For example, B6 center string has a=20
>>beat of about 2 bps.  Not as loud as a real beat between two strings, but=
=20
>>still THERE.   Some higher strings beat faster.
>>
>>I have experimented with seating the strings with my copper rod, at each=
=20
>>bridge pin.  Also tried tapping each bridge pin in a small bit.  Doesnt=20
>>seem to help, except in certain strings.  I did lightly sand and buff the=
=20
>>v-bar before restringing, and think I have the right adjustment on the=20
>>pressure bar.  I've been reading the archives and the PTG CD articles re=
=20
>>false beats, but the number of "hits" for this search term is=
 overwhelming.
>>
>>Can anyone offer me advice on what to do next to reduce the false beats,=
=20
>>short of unstringing and recapping bridge, etc?  I would appreciate your=
 help!
>>
>>Frustrated in Florida,
>>
>>Dave Smith
>>SW FL
>>
>>---
>>
>>Checked by AVG anti-virus system (http://www.grisoft.com).
>>Version: 6.0.486 / Virus Database: 284 - Release Date: 5/29/2003
>
>Greg Newell
>Greg's piano Fort=E9
>mailto:gnewell@ameritech.net
>
>
>----------
>
>---
>
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>Version: 6.0.486 / Virus Database: 284 - Release Date: 5/29/2003
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>
>----------
>_______________________________________________
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>
>
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Greg Newell
Greg's piano Fort=E9
mailto:gnewell@ameritech.net=20

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