THUD

[John D. Chapman]

John,
I did tighten all the screws on the underside of the keybed.

However, you may be right about the jack slapping against the tongue of
the hammer flange.  That would produce the right kind of noise, and,
if the action rails were slightly out of line, would
explain why the noise is in those four consecutive notes at the end of a
section, and no other notes.  

The jack is not digging into the repetition felt when the key is fully
depressed, but it might still be slapping the flange tongue when the note 
is played.

How would you correct this problem?

John Chapman


On Sun, 3 Dec 2000, John Minor wrote:

> How about tightening all screws on the underside of the keybed?
> 
> I've found the jack can slap against the tongue of the hammer flange and
> cause a strange noise. It can be reproduced by pushing up on the jack
> with a snap as if you were attempting to block the hammer against the
> string.
> 
> Also, I've had loose drop screws,(if you can turn them by hand it's too
> loose) and had to shim them with small pieces of traveling tape.
> 
> Good luck.
> 
> John Minor
> University of Illinois
> 
>