Sympathetic vibration (was Re: cellophane)

kam544@flash.net kam544@flash.net
Mon, 25 Mar 2002 13:27:19 -0600


 >    I too would like to learn how to find  noises.
>My piano has a small rattle that only happens on G# .
>I've  fished under the plate for a long time,
>tried knocking the soundboard, holding  my hand
>on different places, and still it rattles Gerald

Gerald, List,

Unfortunately, fishing alone won't do it on grands, as any veteran angler
will testify. It requires a mirror, an adequate flashlight, another person,
a listening ear that can focus on direction and patience.

As an excellent example of elusive sounds and necessary persistance, I just
found this year a sympathetic vibration in a Bosie grand that had been
eluding me for several past tunings. The owner never seemed really bothered
by it, but it certainly aggravated me to a point where I said this far, and
no further.

Oddly, it also was G#, G#5 that is.

I got together with the owner and said I had to find this elusive object.
As it turned out, it was a remmant of music wire from a previous breakage
that occurred years ago. It had lodged ever so neatly between the piano rim
and the soundboard where the tail curves around to meet the straight side.

It took several, looking passes before I finally saw the rascal.

What a great feeling I had. Talk about feel like a champ!

Good luck on your search,

Keith McGavern
Registered Piano Technician
Oklahoma Chapter 731
Piano Technicians Guild
USA





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