[pianotech] Sub Harmonic "buzzing" in Treble Intervals

[Paul T Williams]

Also check for bad damper felts.  Something might be "leaking" down lower. 
 Not only check the board for "stuffs", but check all the screws and make 
sure they're tight.  The whole thing,....action case, lyre, etc.  Amazing 
how one screw can screw up your whole day! Also things around the 
piano....lamps, electrical outlet plates, overhead lights, etc.  Try to 
have help locating the sound.  It could be anywhere...

Paul




From:
tnrwim at aol.com
To:
pianotech at ptg.org
Date:
02/16/2011 12:37 PM
Subject:
Re: [pianotech] Sub Harmonic "buzzing" in Treble Intervals



Jeff
 
Sound like a sympathetic vibration from another source, other than the 
soundboard.
 
There are lots of possibilities, but start with looking all over the board 
for a foreign object. It could even be under the plate, which makes it 
difficult to see.  Is the buzz still there with the lid completely closed? 
Because another source might be the short stick on the prop.
 
Wim




-----Original Message-----
From: Jeff Atkisson <jeffkiss at sonic.net>
To: pianotech <pianotech at ptg.org>
Sent: Wed, Feb 16, 2011 8:24 am
Subject: [pianotech] Sub Harmonic "buzzing" in Treble Intervals

Hi, you all don't really know me - but maybe you have a quick answer 
for me.

It's a Stenway M.
Octave 6 and 7 (mainly)
Play a fourth or a fifth say from E6.
Strange (to me) "buzzing' or humming sound at a lower harmonic (i.e. at 
approximately E5 when playing E6-B6).
Piano is in tune. (does it with single strings)
Only does it it with intervals (not single notes).
Lasts for around a second or two ...
Does it with most of the intervals played in this range (not in high 
treble or below about C6).
It  muddies the sound of  chords and intervals there.

It seems like its the board but I can't seem to stop it by pressing on 
ribs - although I haven't done extensive searching in this regard.

You all know what this is?

Please don't tell be its my ears or my imagination ...

pretty sure I could catch it with a mic if I could post the sound clip.

Thanks

Jeff




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