[pianotech] after ring on bass damper

[Paul T Williams]

Alrighty then... replace the felt and check alignment.  Dampers are such 
tricky devils, aren't they?  I like one previous post of replacing with 
slightly longer felt and see if that works.

I doubt they used good felt. The better felt the better the results, eh?

Paul
 



From:
wimblees at aol.com
To:
pianotech at ptg.org
Date:
08/03/2009 01:14 PM
Subject:
Re: [pianotech] after ring on bass damper



Paul

This is on a brand new piano. 

Wim

-----Original Message-----
From: Paul T Williams <pwilliams4 at unlnotes.unl.edu>
To: pianotech at ptg.org
Sent: Mon, Aug 3, 2009 3:21 am
Subject: Re: [pianotech] after ring on bass damper

Wim, 

Are the damper felts crusty or have corrosion on them? Lifting straight up 
and down or twisting?  Maybe replace the felts. 

Paul 


From: 
wimblees at aol.com 
To: 
pianotech at ptg.org 
Date: 
08/02/2009 10:42 PM 
Subject: 
Re: [pianotech] after ring on bass damper




Jer

I don't think that's the problem, but I'll take a look and give it a try. 
Thanks 


Wim

-----Original Message-----
From: Gerald Groot <tunerboy3 at comcast.net>
To: pianotech at ptg.org
Sent: Sat, Aug 1, 2009 6:08 pm
Subject: Re: [pianotech] after ring on bass damper

Hi Wim, 
  
Have you tried checking the damper guide rail bushings?  I mean, very 
closely?  I had this once on a Yamaha 9 footer.  It was a constant 
problem.  Even though I had plenty of travel and I couldn't get the damper 
to seat any better than it did and even though it lifted and dropped very 
nicely through the damper guide rail bushing hole, (or so I thought) I 
finally removed the damper, cleaned the damper wire, checked it to make 
sure it was going straight up and down, it was, and then ever so slightly, 
I reamed out the damper guide rail bushing hole.  In this case, the 
problem vanished immediately.  Apparently, it was just tight enough, to 
hold up the damper wire enough to allow that tiny bit of ring though.   
  
Jer 
  
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On 
Behalf Of wimblees at aol.com
Sent: Saturday, August 01, 2009 11:04 PM
To: Pianotech at PTG.org; caut at ptg.org
Subject: [pianotech] after ring on bass damper 
  
I've got a Kohler & Campbell 5'9" grand that has very noticeable after 
ring on B1 and C2. At the convention I asked Roger Jolly about it, and he 
showed me how to "voice" the damper felt, by sticking a long needle into 
the felt, first from the front, and then from the back. He demonstrated 
this technique on several notes on a couple of different pianos, and it 
worked quite well. But yesterday I went to the piano in question, and 
tried to do the same thing. I got the damper to work a little better, but 
there is still a lot of after ring. 

This is not a sympathetic vibration coming from another string. The damper 
is properly seated, with plenty of follow through. The actual ring of the 
string stops, but there is excessive after ring. It goes away when I put 
just a little bit of pressure on the damper head.

I'm open to other suggestions. 
Willem (Wim) Blees, RPT
Piano Tuner/Technician
Mililani, Oahu, HI
808-349-2943
Author of: 
The Business of Piano Tuning
available from Potter Press
www.pianotuning.com 


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