Intermittent ZINGing Chopin on M&H 1923 model AA

[Keith Roberts]

I agree with Mike. Start with the condition of the guide bushing. If the
wire has been  over bent, or under bent, the damper drives to one side or
the other as it lifts.
It could be wearing the bushing down. To bend it right, you might have to
change the top offset. That's the first two bends above the string. When you
pull the damper, rough up the felt to make sure a chunk of dirt or something
isn't stuck in the felt.
If the damper is sitting on a harmonic, regulating it differently might
help, such as favoring the front felt a little more.
Listening through a hose will pin point a wire noise but your pianist is
going to have to be pretty good to get it to zing while you're standing over
the piano.
Keith Roberts

>     Dave, I ran into this once and found the damper wire was too close to
a
> string and at certain times a buzzy zing would occur.  Maybe?
>     Mike Kurta

> > Meanwhile, owner complains of a buzzing or zinging sound on G#6 which is
> > intermittant and only appears once in a while in a certain Chopin Etude.
> > Sure enough, no amount of my playing around with this or adjacent notes
> > caused the problem, but I did hear it when she played the Chopin.  Very
> > short ZINGing sound as if a small screwdriver momentarily touched the
> > string.  Damper felt looks normal.   Damper adjustment seems right.  I
> could
> > see nothing out the the ordinary, at least to my eyes.  I removed the
> action
> > and checked the damper wire screw for this note, it was tight.  I did,
> > however, notice that by manually lifting and dropping each damper lever,
> the
> > one for G#6 caused a more metallic  sound when dropped than did its
> > neighbors.  Could not figure out why.  Need to be able to fix this noise
> > upon returning next month.
> >
> > I have read the archives on damper zing.  Dont think it is damper felt
> > problem in this case.  Wondering if loose damper lift flange or a flukey
> > damper spring maybe could cause this sound?  If so, the damper flange
> screws
> > on this model appear to be inaccessable, as they are vertical.  Looks as
> if
> > the entire damper assemply would have to come out just to check lift
> flange
> > screws.
> >
> > It's likely I've missed some basic thingee that everyone else knows.
Hope
> > so!  I would appreciate any thoughts on troubleshooting this noise, as
> well
> > as any insight on how the damper lift flange screws can be tightened,
> short
> > of removing entire damper assembly.
> >
> > Dave Smith
> > SW FL
> >
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> >
>
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