[CAUT] question

[Porritt, David]

Bob:

The riblets helped both power and sustain.  To be sure I was going to be screwing the anchor screw into the bridge I drilled a very small pilot hole down through the bridge.  I put both holes spaced between two ribs and drilled so the screws would go between unisons and would not interest bridge pins.  Then from underneath I scrapped the lacquer off the sounding board where the riblets would be glued to it.  I then applied glue and screwed them on.  The hardest part is getting this old body in the right position and lying on the stage truck.  I used to be younger!

If the sounding board is flexing where it shouldn’t flex then hammers, doping etc. won’t really help.

dave

David M. Porritt, RPT
dporritt at smu.edu

From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Bob Hull
Sent: Tuesday, March 31, 2009 10:21 AM
To: caut at ptg.org
Subject: Re: [CAUT] question

David,

Did the riblets help the sustain or the power or both?

Did you install them beneath the bridge?

I have been wanting to try them for my Kawai GS-60 which is about 13 years old and has lost sustain in the 5th octave especially, also on a S&S D in the university chapel, which seems to be powerless overall except the bass.  I put new hammers on a few years ago and lacquered them well but still it is weak.

Bob Hull

________________________________
From: "Porritt, David" <dporritt at mail.smu.edu>
To: "caut at ptg.org" <caut at ptg.org>
Sent: Monday, March 30, 2009 10:45:55 AM
Subject: Re: [CAUT] question
Ray:

I’ve heard good things about them but have not heard one myself.  I did improve that area of one of our Ds by putting on a couple of Darrell Fandrich’s “riblets”.  I installed 2 between two regular ribs in that problem area.  It’s a tough area to work on - particularly lying on your back under the piano and probably would be easier with the piano on its side.  The downside of that would be hearing the difference the riblet made without putting the piano back on its legs.  In this case people who had no idea that I had done anything, noticed the change and commented (positive comments!).

dave

David M. Porritt, RPT
dporritt at smu.edu

From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Breakall, Raymond
Sent: Monday, March 30, 2009 10:30 AM
To: caut at ptg.org
Subject: [CAUT] question

Fellow techs,

I have a S&S D that has a weak melody octave and wondered about opinions of the “treble tone resonator” that Pianotek sells for a solution to the problem. Thanks

Ray

Ray Breakall
Piano Technician
University of Richmond
(804) 287-6342



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ptg.org/pipermail/caut_ptg.org/attachments/20090331/ffd8fb2e/attachment.html>