[pianotech] Mason & Hamlin Random Resonator

[PAULREVENKOJONES at aol.com]

Will:
 
In line with your question, I have been wondering for a while, as I work on  
another M&H AA, whether there are any remaining factory specs or records of  
manufacture for the torque or number of turns on the turnbuckles, or  any other 
measure that was used to install these. No answer to your question,  just an 
extension of yours. 
 
Paul
 
 
In a message dated 3/11/2009 6:27:07 P.M. Central Daylight Time,  
surfdog at metrocast.net writes:

 
To all: 
I am finishing up a Mason  & Hamlin A 3 and will be delivering it in a couple 
of days.  It’s got  a new board, and I am doing the last of the voicing and 
tuning on the Weikert  hammers.  It sounds good, BUT for a very high pitched 
buzz (hiss) or zing  that I need to isolate and get rid of.  I’ve done the usual 
stuff – all  glue joints are solid, all screws snug, etc, etc.  I went over 
the piano  with a fine toothed comb and a microscope chasing the first bad buzz 
for over  a week – which turned out to be a plate bolt washer under the plate 
near the  treble end – I finally caught it when it glinted just right in my 
mirror with  LED light. 
Anyway, I believe this high  pitched overtone is likely coming from the 
tension resonator.  If I tap  it with my knuckle, I get the same sound coming off 
of it.  Checking the  two large bolts that attach the arms of the resonator to 
the inner rim, I  found that I could loosen them with my fingers.  It is my 
guess that they  were more than finger tightened in the factory in 1913. 
Obviously, I need to at least  snug these at a minimum.  My question is this: 
 Does anyone have any  experience with tightening, snugging these puppies?  I’
m not trying to  pull the rim in as they may have been doing in the factory, 
but I would like  to at least get an appropriate amount of tension on each of 
the bars, so as to  minimize any sympathetic (unsympathetic is  more like it!) 
 vibrations.   
Any help would be  appreciated.  Thanks. 
Will  Truitt


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