Over sharp treble

[Don]

Hi Ron,

If this is so why are the tenor plain steel strings the very most affected
by humidity change?

At 10:11 PM 31/10/2004 -0600, you wrote:
>Hi Cy,
>Good observation. This, among other things, is why the assumption that 
>soundboard rise and fall is the primary reason strings go out of tune with 
>humidity swings doesn't make sense. The amount the soundboard would have to 
>rise and fall, and the deflection angle changes that would result just 
>don't happen to the degree necessary to produce the pitch changes we 
>observe. More than soundboard crown changes, bridge cap swelling pushing 
>the strings up the pins, which are slanted, making the string take a longer 
>path across the bridge, stretching it more, and raising the tension and 
>pitch. The string path in each unison will increase about the same because 
>the pin angles are usually the same throughout the scale, but the overall 
>string length in the treble is less, making the percentage of length change 
>greater, making the tension change greater, making the pitch change greater.
>
>That's what I think is happening.
>
>Ron N

Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
Non calor sed umor est qui nobis incommodat

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