[pianotech] Echo Issue

[Greg Newell]

Matthew,

                It seems to me that someone tried cleaning something and
left a residue behind. I wonder if replacing the felt and cleaning the
affected area of the string with brake cleaner would help. I’ve never tried
brake cleaner on wound strings so I don’t know what the effect might be. Any
know?

 

Greg Newell

Greg's Piano Forté

www.gregspianoforte.com

216-226-3791 (office)

216-470-8634 (mobile)

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Matthew Todd
Sent: Tuesday, March 01, 2011 12:41 PM
To: pianotech at ptg.org
Subject: [pianotech] Echo Issue

 


Hi all,

 

I have a customer with a Kawai Upright BL-51, about 25 years old.  When you
play in the middle of the keyboard, there is a obvious ring, or echo after
you release your fingers from the keys.  The after ring lasts indefinitely
until the sound eventually dies off.

 

After spending some time troubleshooting where exactly the echo was coming
from, I isolated the problem to the bass end.  After playing the middle of
the keyboard, I placed my palm on the entire unichord bass section, and the
echo immediately vanished.  Everything else, damper alignment, etc seemed to
be in good order.

 

After removing the action, I discovered where the dampers rest on the bass
strings, there is a good amount of what appears to be black "gunk" on the
strings.  I say "gunk" because when I touch the affected areas with my
fingers, it is somewhat sticky.  The gunk is also on the dampers themselves,
but it looks more green when on the white damper felt.

 

So, before I run a quote to this customer, I am hoping to try and discover
what caused this problem in the first place, and find the best course of
action.

 

Any help from this list I am sure will be beneficial in aiding in this
diagnosis.  I hope the attached pictures go through as well.  Please let me
know, thanks!

TODD PIANO WORKS 
Matthew Todd, Piano Technician 
(979) 248-9578

http://www.toddpianoworks.com <http://www.toddpianoworks.com/> 

 

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