Hamburg Steinway "D" bass (wound string) Buzz

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I also have been surprised that the buzz is isolated in the bass strings and 
that all of the bass strings are producing a buzz.  The first thing I thought 
of was something loose on the soundboard, loose ribs etc but after numerous 
checks have just about decided it is the bass strings windings. When I twist the 
string or replaced a string there was a definite improvement but a buzz that 
sounds like loose winding is pronounced. >>

If the buzz is on all the strings, and after twisting one, there is still a 
buzz,  I would think it something other than strings.  Check the tightness of 
any soundboard buttons, (there is a hidden one a the very top of the bridge in 
most N.Y. Steinways).  
  Then, have someone play the bass so that the buzz is most audible and begin 
pressing on the soundboard from underneath.  Make sure that all cut-outs of 
the bridge are clear, if something gets trapped in them, or under them, it will 
always make noise.  
Good luck, 



Ed Foote RPT 
http://www.uk-piano.org/edfoote/index.html
www.uk-piano.org/edfoote/well_tempered_piano.html