[CAUT] brightening a Yamaha

[Fred Sturm]

	It's possible that filing with very fine paper, a la Kawai tech  
procedure (meaning 1000 grit plus) will help. This removes minimal  
material, and seems to pack felt at the surface, at least in my  
experience. Gives a subtle bit more "zing." Paddle or strip (backed  
with tape).
	There's also ironing. Using the brass fixture in a thermostatically  
controlled soldering iron (IOW, the keybushing ironing/sizing system)  
gives controlled results. One can vary temperature, time, and  
pressure applied.
	And then there is single needle deep probe in the shoulder. Straight  
toward the core, or perhaps angled a bit up toward the crown.  
Experiment, sometimes yes, sometimes no.
	Something Terry Otake showed us at the Shigeru Kawai one week  
seminar was a deep, multi-needle push from shoulder up toward the  
crown, using the metal needle fixture sold by Pianoforte Supply and  
Renner (Page 3-7 Renner catalogue, #1430D), intended for upright  
hammers. This is short enough that you can use it with fairly long  
needles and more or less "scoop them" from mid to deep shoulder so  
that the needle heads fairly deeply in the direction of the crown  
(easier to show than describe). The visualized concept is that you  
are pushing interior felt upward. I have had success to some extent  
with this.
	Oops, now re-reading your post I see it is an upright model. Well, I  
guess all but the last item apply, and the last item might work but  
only from the top, and no need for the special tool. A regular needle  
tool would work. The special tool is for doing it from the shank side  
on a grand, needed because there isn't much room. Can't get there on  
an upright unless you remove the whole butt assembly.
Regards,
Fred Sturm
University of New Mexico
fssturm at unm.edu



On Jun 14, 2007, at 10:17 AM, reggaepass at aol.com wrote:

> Hi Lists,
>
> A client with a two year old Yamaha U1F complains that the C5-B5  
> octave is not as bright as the rest of the piano.  I listenened,  
> and proposed to voice down the surrounding octaves.  He wants me to  
> brighten up the octave in question instead.  I've never had to make  
> a Yamaha brighter before.  I would probably be inclined toward some  
> slight of hand if not for the fact that he sits there and watches  
> the entire time I am working on his piano.
>
> I cannot imagine juicing Yamaha hammers.  Is there another way to  
> go other than filing the hammers in the C5-B5 octave?
>
> Thanks,
>
> Alan Eder
> ______________________________________________________________________ 
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