Mason&Hamlin A board replacement

[Erwinspiano@AOL.COM]

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In a message dated 8/7/2002 5:35:26 PM Pacific Daylight Time, 
mcpiano@globetrotter.net writes:


> Subj:Mason&Hamlin A board replacement 
> Date:8/7/2002 5:35:26 PM Pacific Daylight Time
> From:<A HREF="mailto:mcpiano@globetrotter.net">mcpiano@globetrotter.net</A>
> Reply-to:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
> To:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
> Sent from the Internet 
> 
>            Marcel

        It would be simple enough to discard the apron and move the bass 
bridge forward as far as the plate will allow  which would allow the 
backscale length some improvement. Yes, the bass strings would be a bit 
shorter but you'd gain back scale length. The mono chord section which needs 
it most desperately.
     On one of the two As I did last year I did what I call a partial float 
at the end of the tenor bridge which was done by drawing a line from one end 
of the maple cap piece on the board to the other end, installing a small rib 
on the bottom underneath the line and a thin maple strip over it on the top 
for a little reinforcing. I made the cut after the auxiliary ribs were on.
     As clarification the piece I'm referring to is the maple piece at the 
tail of the piano that sits on top of the board and is screwed into the rim. 
That piece IMO is there because there is a good deal of bending strain 
required to get the tail to sit down on the rim there at glue in and this is 
their insurance it won't surprise them.
    Any way the modification allowed this area to be free of that strain and 
the improvement in the bass, even though I did not change the bass bridge 
config. was very noticeable in the sustain and overall sonority of the bass. 
On the next one I'll add about 4 bi-chords to the bottom of the tenor or add 
a supplemental bridge and move the bass bridge forward
   On the other A I used the same materials, ribbing, but no float. I liked 
the sounds of the floated board better, the sustain through out was greater.
    I'm not advocating any one do this but just sharing my own journey. I'm 
sure there are other ideas and methods that have more merit "floating" around 
in cyber space.
      Dale Erwin
   

> 
> Hi!
> 
> I've just taken out the board of the above mentioned piano. It's the
> first time I see a board that was so well glued and screwed down.
> Would it be better to float the bass end of this particular model? And
> isn't the ribbing a little too stiff in the treble?
> 
> To me there are a lot of ribs in the treble. Would I just be looking
> for trouble if I were to try to improve it? And if I did, I surely
> would like to have some previous experience feedback from some of you
> PLEASE.
> 
> Marcel Carey, RPT
> 2852 Dussault
> Rock Forest  QC
> J1N 2V6
> (819) 564-0447
> mcpiano@globetrotter.net
> 


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