[pianotech] Steinway A Bass String Rescaling

JUDE REVELY juderev at verizon.net
Fri May 22 18:18:18 MDT 2009


> Hi Jude,
> Explain, please. Too little inharmonicity by what standard, and arrived at 
> how?
>
> Ron N
>

Hi Ron,

Sure, I'll try. Too little inharmonicity by the standard of what is 
generally considered to be good strong fundamental bass tone, and arrived at 
according to Dr. Sanderson's formula. I stick to the ranges that he 
originally presented in his handout. I'm not saying it's the Holy Grail but 
that it's a reasonable parameter to observe. Dr. Sanderson did an experiment 
where he designed a set of strings with 0 inharmonicity. I was unfortunately 
not a primary aural witness to the end result so my "observations" are 
hearsay. So I, too, ask myself, well if this set of strings sounded so bad, 
what were the other factors (T,Z, S, NT/H etc). I'm thinking that I can 
repeat the experiment for a few unisons on one of my own pianos and let my 
own ears be the judge.

Will,

The other factor that I was thinking about today was the load on your bass 
bridges. These cantilevers prefer a particularly light load. I'm finding 
that on a healthy board, you have to set the distance bearing so that the 
string just barely misses contacting the bridge by the time it contacts the 
counterbearing. When the treble bridge is loaded, the bass bridge will rise 
a bit to give you that ever so slight bearing angle. Maybe you can get your 
Wixey gage on it.

Jude 



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