[CAUT] Fiberboard

[Richard Brekne]

Hi

I would tend to agree with both of Dougs points here. I dont think 
friction at or close to the agraffe gets into this picture... tho 
increased friction may have some influence on how the string renders 
over the felted area... still thats something else.  From the capo 
discussions dealing with the front duplex subject, we have heard many 
times that some combinations of lengths and offset angles for this front 
string segment will start causing noise. Off hand it would seem to me 
that an agraffe would be more susceptible to this kind of problem then 
the capo bar.  I would tend to want to keep the distance between the 
string bearing on the felt and the agraffe pretty short.

Cheers
RicB


    Doug Wood writes:

    I believe it is about clamping/damping the string close to the  
    agraffe. The distance can make a difference. There is a local tech  
    who likes to put a brass rod under the strings at about 3/8 to 1/2  
    inch from the agraffes when restringing. I had a customer with one of  
    these pianos who was VERY displeased with the sibilance this  
    produced, so after setting everything else up as well as I could  
    (regulating, voicing, etc.) I still got to extract the rod.  Fun. But  
    the customer was much happier. My impression was that having that  
    whole section undamped made far more difference than I'd guessed  
    based on just one note. But do listen to individual notes with and  
    without your finger pressing close to the agraffe for the general  
    effect.

    Doug



On May 17, 2007, at 4:46 PM, Jon Page wrote in reply to:

         >> Doug Wood writes:
         > >the back side of this (closest to the agraffe) needs to be
        high  enough that you
         > >cannot get your fingernail between the strings and the
        cloth. It does seem
         > >to me that those pianos that do not meet this criterion tend
        to have
         > >more agraffe noise in an unpleasant way.


     > The two I've done so far have had no problems but that's not a  
    large sampling.
     > But I don't see the advantage to a friction point so close to
    the   agraffe.
     > --
     >
     > Regards,
     >
     > Jon Page

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