THUD

[Horace Greeley]

Good Evening, John,

I like Roger's ideas a lot.

Also, could you describe "THUD" a bit more?  Does is vary with the 
blow?  Seem to center around any particular pitch/physical area?  If this 
is a fairly recent instrument (would seem to be a C&A D, from your note), 
the current state of forefinishing could easily leave odd and/or unusual 
areas of the keyframe and keybed in much too close proximity.

I think that the one thing the problem is not is probably hammers.

Please keep us on the edge of our seats!

Best.

Horace



At 07:17 PM 11/21/2000 -0600, you wrote:
>Hi John,
>              Is the rear of the key frame slapping up against the dag??? To
>check use a long thin bladed screw driver and press down on the rear of the
>frame, whilst playing the note hard. Also the top of the unacorda lever if
>it is too long can slap against the top of the keyframe.  Press the pedal
>firmly and listen for any changes. Smear a thin coat of white protech
>grease on to the top of the lever and check to see if any transfers to the
>under side of the frame.
>Just some ideas
>Roger
>
>
>At 08:02 PM 21/11/00 -0500, you wrote:
> >Just tuned a S&S D brought in by the dealership for a Brahms concerto with
> >the symphony.  Notes 50,51,52,&53 (last four in agraff section, just above
> >A440) had an unpleasant pronounced THUD when played above forte.  This is
> >the same THUD which is always there lurking behind piano tone but usually
> >not dominating it.  I checked keyframe front, back, and glides, checked
> >for loose hammers, held up dampers heads by hand and played the note to
> >see if it was a damper problem and it was  not, checked damper upstop
> >rail, seated strings on bridge, reshaped hammers to that nice S&S pointy
> >shape, tried needling, tried juicing, switched a couple of hammers from a
> >few notes below where the sound is good just to see if it was a hammer
> >problem and it was not.  What have I missed?  The one thing I didn't do
> >which might have help diagnose the problem was to pull the action in and
> >out to change the strike point.  What do you think?
> >
> >John D. Chapman RPT
> >Wake Forest University
> >Winston-Salem NC
> >
>Roger Jolly
>Saskatoon, Canada.
>306-665-0213
>Fax 652-0505