false beats from ?? -...

[Don]

Hi,

If the cause of the false beat is the pin moving in the wood then CA serves
more than just one purpose. It tends to fill any gaps, it tends to fill and
voids, it tends to size the hole, AND it increases the density (hardness?)
of the wood.

If, on the other hand, it is a "wood problem" CA may help to reduce the
false beat--even if the pin appears to be "tight", because it may increase
the "firmness" in some manner.

This may also explain why Ric B. had no false beat results with "sloppy"
pins where he deliberately tried to "induce" a false beat. The wood was
"firm" and the side bearing was great enough to keep the pin "still"
against the "support" from the bridge, providing a "beat free" termination.

Why does the pin move? Because the support is insufficient.

I'll have some results in about 3 months from a Damppchaser install (on a
grand piano of famous make) where one bridge pin on A4 is causing a false
beat. If it clears up I'll be very happy. I already know that in this case
that "mass loading" the pin quiets the false beat. I'll take along some CA
just in case the DC doesn't have the desired effect.

At 08:27 AM 12/18/2005 -0800, you wrote:
>The cause would be an oscillation of the pin creating, in effect, a changing
>speaking length and an irregular wave pattern in the vibrating string.  Or
>something like that.  
>
>David Love

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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