maddening dampers

John Delacour JD@Pianomaker.co.uk
Wed, 21 Nov 2001 11:35:28 +0000


At 2:55 AM -0700 11/20/01, Dave Nereson wrote:

>Damper not damping.  Grand or upright?  Doesn't matter -- happens on both....

Your question is too general, and to say that your damper is not 
damping is also an exaggeration, you will admit, since everything is 
"OK".  So it is damping some partials, including the first, quite 
effectively but leaving some high partials undamped, and your damper 
is probably in the bass or the tenor.  Some expensive German pianos 
(and probably some American - eg. old Steinway uprights for 8 notes 
in the tenor)  have a fly damper above or below the main damper to 
kill these overtones and I have even come across a piano (Kaim of 
Stuttgart) with a full overdamper (birdcage) action throughout the 
bass in addition to the underdampers.  There have been many 
inventions to overcome this problem.

If lengthening or repositioning the main damper block does not solve 
the problem, find out where the fly dampers are needed and add these 
to the section giving the problems.  The problem should not arise on 
a grand if the dampers are properly positioned.

JD



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