Treble resonator

[Isaac OLEG]

Joe,

Was for ease of installation

When the turnbuckle is tensionned, the little wooden plank that is
installed from the belly to the brace in not tensionned anymore.

The belly does not really move so much, the turnbuckle is adding
stiffness on a little part of the board, it strenghen 10 notes around
the last plate brace, nothing magical, just a little bit more body and
a fuller spectra.


Resonnator does not tell it indeed - here are instructions from Bob
Grijalva :


1.  If the bolt in the rim attachment is bent correctly and you have
attached the plate to the belly rail in a straight line, the
turnbuckle should not be too difficult to move slightly back and forth
with no tension.  But, if there is a tiny bit of tension, I don't
think this is something to worry about, because you will be placing a
great deal more tension on the turnbuckle when you really get down to
business.

2.  Do not pre-tension the device. Your ability to decide how much to
tighten it will depend upon listening to the piano with the device in
a neutral position first.  So, you must string the piano first. That
will also help to prevent the inversion of the soundboard you
mentioned.

3.  You must do whatever voicing you can to produce the best tone you
canget before you apply any tension to the device.  The intention of
the device is to create a new platform for further voicing.  So, you
must first voice the piano the best way you can before applying any
change with the device. You will hit the voicing "WALL", and that is
when you will apply tension to the device.  There will be that moment
in voicing when you know that the quality of sound is not improving
and the timbre is not smooth.  This is the WALL.  You cannot penetrate
it unless you apply tension.

Turn the device in small amounts...maybe 1/8 of a turn each time.
Then listen with great care.  You must always listen after each small
turn.
Listen to all the qualities of the sound that you can think of: impact
volume, clarity, bloom, length of decay and quality of decay (for
example,is the decay a smooth line, or does the decay drop in steps).
You will have to compare all the groups of notes in the capo to make
the best decision when to stop turning the device.

In my experience with Steinway, the area where the timbre improves is
usually from circa notes 60 to 75, across the capo d'astro break.


Good Luck.  Let me know how this works for you.


Robert Grijalva
Asst. Professor and Director, Piano Technology
University of Michigan School of Music


Isaac OLEG

Entretien et réparation de pianos.

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> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Joseph Garrett
> Envoyé : mardi 8 juillet 2003 17:48
> À : pianotech@ptg.org
> Objet : Re: Treble resonator
>
>
> Please excuse my ignorance, but I'm curious as to how the
> "turnbuckle" is
> used. Once the "resonator", (not a good term IMHO), is
> installed, does the
> turnbuckle draw inward or push outward. In my experience,
> (limited), the rim
> is extremely solid and the belly rail is very weak. It
> appears to me that,
> either pushing or pulling is going to traumatize the belly
> rail, not to
> mention, anything attached to the belly rail! To my way of
> thinking, a brace
> is a far better addition. This "brace" would need to be
> installed BEFORE the
> piano is brought to tension. Some clarification is needed,
> (at least for
> me).
> The photos provided by Isaac show the "resonator"
> installed. One item that
> caught my attention, was that the bolt for the "bell" was
> removed! Was the
> installation of the "resonator" in lieu of the "bell"
> function? Or, was this
> simply a photo taken during installation and the bolt was removed
> temporarily for ease of the installation?
> Too many variables/questions to be answered methinks.
> Best Regards,
> Joe Garrett, RPT, (Oregon)
>
> Been There, Didn't Like It, So I'm Here To Stay! [G}
>
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