[CAUT] Agraffe noise

[Robert Callaghan]

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Dear List,

I just started at the local college.  There is one grand piano there
where many plain wire strings and a few bass have a very loud hiss or
sizzle.  If is was a bass string you'd think the copper wrap was loose,
but twisting the string didn't help.  It is the worst case of this I've
ever seen.

The piano has signs of being worked on.  Beside pieces of felt stuck
here and there trying to get rid of the zinging,  there are Pin-Tite
stains on the plate and rock hard, overly lacquered hammers.  On other
pianos I've had good luck tugging upwards on the string, or cleaning out
the hole in the agraffe.  But that hasn't helped in this case.  If I
push down firmly on the string on the tuning pin side of the agraffe it
stops.  There is felt there so it isn't a vibrating string.  In my
research I found a Journal article that mentions that maybe the agraffe
itself is loose.

I wanted to run this by you all before I began testing this theory, or
perhaps someone knows exactly what the problem actually is.  (And
because I have the piano faculty looking over my shoulder I  want to be
right the first time!)

Thanks for any insights.

Bob Callaghan

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