Hello everyone, the problem concerns a KAWAI upright piano mod. BL-12 serial number M798709.
After playing the B note on key 31 and the E note on key 32, the damper stops the string, but a thin harmonic remains vibrating. I have replaced the damper felt, I have aligned everything, but the disturbance continues. I also changed the type of felt, but it is the same thing. In particular, the first of the 3 strings continues to resonate.
What can I try?
On some instruments I have seen a supplementary damper, mounted on top of the standard one, ???
Are we by any chance in the intersection area? Try cutting the longer ribbon shorter relative to the small wooden piece, downwards if there is space (basically make use of the available space) and see if it improves.
You can also check the spacing of the strings; if the damping doesn't engage properly, they can be widened a little, or the unison can be tightened if too wide, or adjusted if not symmetrical relative to the central string... As a last resort, you could also try pricking the ribbon where it rests on the strings (the felt swells and generally works better).
There are many things to try; a new ribbon needs time to settle (imprints must form).
Avoid touching the wires; if you have already done so, you have done it incorrectly
HA
Historical author
Reply 3 by Historical author
Hello,
Have you tried replacing the spring?
If the problem is in the intersection area, a spring with a slightly larger diameter might help. In this case, however, you would have a slightly increased key dip weight...
The metal rod that supports the damper, it's better not to try to orient it differently after having ruled out everything else....eventually you can also try to put more load on the clip, but where the dampers are smaller, the problem is physiological.
Try to make the ribbon protrude from below, you will have a larger useful surface
Also for the gluing, first check the positioning of the small bow on the strings so that when plucking them, no harmonics or resonances are heard.... Then leave it in position and let the small wooden piece rest on top naturally; use a very thick white glue (just let it dry a bit in a glass) and you will see that this way it finds the right position, ok?
