[pianotech] after ring on bass damper

[Gerald Groot]

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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