Pianotech

I work on a MH upright, newish, that has an annoying after-ring that clearly emanates from the monochords only.  I'm looking for solutions that folks have found to this issue by installing damper extensions.  There's plenty of force on the strings applied by the damper springs, in fact, more than is desirable in terms of touch characteristics, so it's not that and I'd prefer not to increase that force even if it were to have the desired effect.

It may be that the dampers are touching or are near a harmonic node but there aren't any realistic options to moving the dampers.  So the only options seem to be extending the existing dampers by installing longer dampers or adding a damper wire extension (see below).  What have any of you found to be the most effective and if it's the wire extenders where did you get those parts and how did you go about attaching them.  I'm thinking this type of idea though for the monochords (the picture below is for the low tenor),

Juergen had the extenders available through his supply company that Dale Erwin now operates: https://pianofortesupply.com/
Never seen them on monochords, though! I'd try the heavier brass barrels first, and then different felt &/or configuration of felt pieces.
Good luck!

I work on a MH upright, newish, that has an annoying after-ring that clearly emanates from the monochords only.  I'm looking for solutions that folks have found to this issue by installing damper extensions.  There's plenty of force on the strings applied by the damper springs, in fact, more than is desirable in terms of touch characteristics, so it's not that and I'd prefer not to increase that force even if it were to have the desired effect.

It may be that the dampers are touching or are near a harmonic node but there aren't any realistic options to moving the dampers.  So the only options seem to be extending the existing dampers by installing longer dampers or adding a damper wire extension (see below).  What have any of you found to be the most effective and if it's the wire extenders where did you get those parts and how did you go about attaching them.  I'm thinking this type of idea though for the monochords (the picture below is for the low tenor),

Jim Ialeggio demonstrated the effectiveness of adding a little lead weight asymmetrically on to the damper as well. This really quieted things down.

Peter Grey Piano Doctor 

Juergen had the extenders available through his supply company that Dale Erwin now operates: https://pianofortesupply.com/
Never seen them on monochords, though! I'd try the heavier brass barrels first, and then different felt &/or configuration of felt pieces.
Good luck!

I work on a MH upright, newish, that has an annoying after-ring that clearly emanates from the monochords only.  I'm looking for solutions that folks have found to this issue by installing damper extensions.  There's plenty of force on the strings applied by the damper springs, in fact, more than is desirable in terms of touch characteristics, so it's not that and I'd prefer not to increase that force even if it were to have the desired effect.

It may be that the dampers are touching or are near a harmonic node but there aren't any realistic options to moving the dampers.  So the only options seem to be extending the existing dampers by installing longer dampers or adding a damper wire extension (see below).  What have any of you found to be the most effective and if it's the wire extenders where did you get those parts and how did you go about attaching them.  I'm thinking this type of idea though for the monochords (the picture below is for the low tenor),

Juergen had the extenders available through his supply company that Dale Erwin now operates: https://pianofortesupply.com/
Never seen them on monochords, though! I'd try the heavier brass barrels first, and then different felt &/or configuration of felt pieces.
Good luck!

I work on a MH upright, newish, that has an annoying after-ring that clearly emanates from the monochords only.  I'm looking for solutions that folks have found to this issue by installing damper extensions.  There's plenty of force on the strings applied by the damper springs, in fact, more than is desirable in terms of touch characteristics, so it's not that and I'd prefer not to increase that force even if it were to have the desired effect.

It may be that the dampers are touching or are near a harmonic node but there aren't any realistic options to moving the dampers.  So the only options seem to be extending the existing dampers by installing longer dampers or adding a damper wire extension (see below).  What have any of you found to be the most effective and if it's the wire extenders where did you get those parts and how did you go about attaching them.  I'm thinking this type of idea though for the monochords (the picture below is for the low tenor),

I'll contact Dale.  I don't think I want to "try" things, I'm interested in what people have done that they know works.  I'm pretty sure an extension is the right answer here.  thanks

Juergen had the extenders available through his supply company that Dale Erwin now operates: https://pianofortesupply.com/
Never seen them on monochords, though! I'd try the heavier brass barrels first, and then different felt &/or configuration of felt pieces.
Good luck!

I work on a MH upright, newish, that has an annoying after-ring that clearly emanates from the monochords only.  I'm looking for solutions that folks have found to this issue by installing damper extensions.  There's plenty of force on the strings applied by the damper springs, in fact, more than is desirable in terms of touch characteristics, so it's not that and I'd prefer not to increase that force even if it were to have the desired effect.

It may be that the dampers are touching or are near a harmonic node but there aren't any realistic options to moving the dampers.  So the only options seem to be extending the existing dampers by installing longer dampers or adding a damper wire extension (see below).  What have any of you found to be the most effective and if it's the wire extenders where did you get those parts and how did you go about attaching them.  I'm thinking this type of idea though for the monochords (the picture below is for the low tenor),

I'll contact Dale.  I don't think I want to "try" things, I'm interested in what people have done that they know works.  I'm pretty sure an extension is the right answer here.  thanks

Juergen had the extenders available through his supply company that Dale Erwin now operates: https://pianofortesupply.com/
Never seen them on monochords, though! I'd try the heavier brass barrels first, and then different felt &/or configuration of felt pieces.
Good luck!

I work on a MH upright, newish, that has an annoying after-ring that clearly emanates from the monochords only.  I'm looking for solutions that folks have found to this issue by installing damper extensions.  There's plenty of force on the strings applied by the damper springs, in fact, more than is desirable in terms of touch characteristics, so it's not that and I'd prefer not to increase that force even if it were to have the desired effect.

It may be that the dampers are touching or are near a harmonic node but there aren't any realistic options to moving the dampers.  So the only options seem to be extending the existing dampers by installing longer dampers or adding a damper wire extension (see below).  What have any of you found to be the most effective and if it's the wire extenders where did you get those parts and how did you go about attaching them.  I'm thinking this type of idea though for the monochords (the picture below is for the low tenor),

I work on a MH upright, newish, that has an annoying after-ring that clearly emanates from the monochords only.  I'm looking for solutions that folks have found to this issue by installing damper extensions.  There's plenty of force on the strings applied by the damper springs, in fact, more than is desirable in terms of touch characteristics, so it's not that and I'd prefer not to increase that force even if it were to have the desired effect.

It may be that the dampers are touching or are near a harmonic node but there aren't any realistic options to moving the dampers.  So the only options seem to be extending the existing dampers by installing longer dampers or adding a damper wire extension (see below).  What have any of you found to be the most effective and if it's the wire extenders where did you get those parts and how did you go about attaching them.  I'm thinking this type of idea though for the monochords (the picture below is for the low tenor),

I work on a MH upright, newish, that has an annoying after-ring that clearly emanates from the monochords only.  I'm looking for solutions that folks have found to this issue by installing damper extensions.  There's plenty of force on the strings applied by the damper springs, in fact, more than is desirable in terms of touch characteristics, so it's not that and I'd prefer not to increase that force even if it were to have the desired effect.

It may be that the dampers are touching or are near a harmonic node but there aren't any realistic options to moving the dampers.  So the only options seem to be extending the existing dampers by installing longer dampers or adding a damper wire extension (see below).  What have any of you found to be the most effective and if it's the wire extenders where did you get those parts and how did you go about attaching them.  I'm thinking this type of idea though for the monochords (the picture below is for the low tenor),

I work on a MH upright, newish, that has an annoying after-ring that clearly emanates from the monochords only.  I'm looking for solutions that folks have found to this issue by installing damper extensions.  There's plenty of force on the strings applied by the damper springs, in fact, more than is desirable in terms of touch characteristics, so it's not that and I'd prefer not to increase that force even if it were to have the desired effect.

It may be that the dampers are touching or are near a harmonic node but there aren't any realistic options to moving the dampers.  So the only options seem to be extending the existing dampers by installing longer dampers or adding a damper wire extension (see below).  What have any of you found to be the most effective and if it's the wire extenders where did you get those parts and how did you go about attaching them.  I'm thinking this type of idea though for the monochords (the picture below is for the low tenor),

I work on a MH upright, newish, that has an annoying after-ring that clearly emanates from the monochords only.  I'm looking for solutions that folks have found to this issue by installing damper extensions.  There's plenty of force on the strings applied by the damper springs, in fact, more than is desirable in terms of touch characteristics, so it's not that and I'd prefer not to increase that force even if it were to have the desired effect.

It may be that the dampers are touching or are near a harmonic node but there aren't any realistic options to moving the dampers.  So the only options seem to be extending the existing dampers by installing longer dampers or adding a damper wire extension (see below).  What have any of you found to be the most effective and if it's the wire extenders where did you get those parts and how did you go about attaching them.  I'm thinking this type of idea though for the monochords (the picture below is for the low tenor),

I work on a MH upright, newish, that has an annoying after-ring that clearly emanates from the monochords only.  I'm looking for solutions that folks have found to this issue by installing damper extensions.  There's plenty of force on the strings applied by the damper springs, in fact, more than is desirable in terms of touch characteristics, so it's not that and I'd prefer not to increase that force even if it were to have the desired effect.

It may be that the dampers are touching or are near a harmonic node but there aren't any realistic options to moving the dampers.  So the only options seem to be extending the existing dampers by installing longer dampers or adding a damper wire extension (see below).  What have any of you found to be the most effective and if it's the wire extenders where did you get those parts and how did you go about attaching them.  I'm thinking this type of idea though for the monochords (the picture below is for the low tenor),

I work on a MH upright, newish, that has an annoying after-ring that clearly emanates from the monochords only.  I'm looking for solutions that folks have found to this issue by installing damper extensions.  There's plenty of force on the strings applied by the damper springs, in fact, more than is desirable in terms of touch characteristics, so it's not that and I'd prefer not to increase that force even if it were to have the desired effect.

It may be that the dampers are touching or are near a harmonic node but there aren't any realistic options to moving the dampers.  So the only options seem to be extending the existing dampers by installing longer dampers or adding a damper wire extension (see below).  What have any of you found to be the most effective and if it's the wire extenders where did you get those parts and how did you go about attaching them.  I'm thinking this type of idea though for the monochords (the picture below is for the low tenor),

It's not a leak or a wobble or even a slow or inconsistent shut off. I believe it's a harmonic node issue as the ringing continues for several seconds before it finally, and slowly, dissipates. Therefore I don't think mass is the answer.  I think it's a design problem relating to the location of the dampers in that section. The problem is only with mono chords and pretty much all of them.

The answer, I believe, would be to move the damper so it's not on or near the node but since that's not so easy to do on an upright, a damper extension seems to be the logical solution. 

I'll report back once I've addressed it. The location of piano is such that I don't want to make more than one trip to resolve this if possible. 

I work on a MH upright, newish, that has an annoying after-ring that clearly emanates from the monochords only.  I'm looking for solutions that folks have found to this issue by installing damper extensions.  There's plenty of force on the strings applied by the damper springs, in fact, more than is desirable in terms of touch characteristics, so it's not that and I'd prefer not to increase that force even if it were to have the desired effect.

It may be that the dampers are touching or are near a harmonic node but there aren't any realistic options to moving the dampers.  So the only options seem to be extending the existing dampers by installing longer dampers or adding a damper wire extension (see below).  What have any of you found to be the most effective and if it's the wire extenders where did you get those parts and how did you go about attaching them.  I'm thinking this type of idea though for the monochords (the picture below is for the low tenor),

It's not a leak or a wobble or even a slow or inconsistent shut off. I believe it's a harmonic node issue as the ringing continues for several seconds before it finally, and slowly, dissipates. Therefore I don't think mass is the answer.  I think it's a design problem relating to the location of the dampers in that section. The problem is only with mono chords and pretty much all of them.

The answer, I believe, would be to move the damper so it's not on or near the node but since that's not so easy to do on an upright, a damper extension seems to be the logical solution. 

I'll report back once I've addressed it. The location of piano is such that I don't want to make more than one trip to resolve this if possible. 

I work on a MH upright, newish, that has an annoying after-ring that clearly emanates from the monochords only.  I'm looking for solutions that folks have found to this issue by installing damper extensions.  There's plenty of force on the strings applied by the damper springs, in fact, more than is desirable in terms of touch characteristics, so it's not that and I'd prefer not to increase that force even if it were to have the desired effect.

It may be that the dampers are touching or are near a harmonic node but there aren't any realistic options to moving the dampers.  So the only options seem to be extending the existing dampers by installing longer dampers or adding a damper wire extension (see below).  What have any of you found to be the most effective and if it's the wire extenders where did you get those parts and how did you go about attaching them.  I'm thinking this type of idea though for the monochords (the picture below is for the low tenor),