[pianotech] Echo issue

[Paul T Williams]

Matthew, did you check to see if the dampers "follow" the strings when 
pressing on the strings away from you? Could be a regulation problem as 
well.  I can't explain why there is black sticky stuffs on your fingers 
off the strings....weird.  Try putting on new damper felt after cleaning 
the strings somehow with a soft brass wire brush and a bit of Naptha.  Is 
it a mold of some sort?  New felts seem to be a probable fix with good 
regulation.

I've found a lot of old uprights seem to have that "resonance" after a 
song, piece, note, etc is played.  I think some of that was favorable in 
those days.  Our harpsichord rebuilder mentioned that when he brought back 
one of ours after a rebuild.  Apparantly, it was popular in the day for 
the instruments to resonate a bit after playing...not like, say, Yamaha's, 
that stop immediately, which seems to be the expected these days.  Just 
more thoughts....BTW, Nobody liked this dwindling sound, so I and Richard 
West had to reconfigure the dampers on it. Ugh! That was a pain after 
$7,500!! (lots of other stuff was done, though).

Good luck!

Paul




From:
David Boyce <David at piano.plus.com>
To:
pianotech at ptg.org
Date:
03/01/2011 01:47 PM
Subject:
Re: [pianotech] Echo issue



Matthew, I notice from your photos that the discolouration is severe on 
only the first of the three sections of felt on these bass dampers. 

This could mean that only that first section on each damper, is in contact 
with the strings, if the discolouration arises from some cehmical reation 
between the strings and something in the felt.

It's possible, if that's the case, that it is simply this lack of complete 
contact with the strings, that is leading to the "ringing on" of the bass 
strings, and that the chemical discolouration is a completely separate 
issue.

Just a thought.

Best regards,

David Boyce

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