Petrof Grands

[Erwinspiano at aol.com]

Hi RIc
   The short version is that the geometry is really good.   It's like 5.2 to 
1.  Problem is they then over tax the system with a hammer  that weighs way 
too much.  ie.  Note 4- 12.5 grams note 40.--8.5  grams.
   Then they compensate with lead & wippen helper springs so  they end up 
having an action that feels like to much intertia. Mostly with the  springs
  The real fix is to lighten or replace the hammers.  I vote  replace as the 
old ones are funky.
  reweigh the keys without the helper springs hooked up but  allow  some 
effect in your touch weight equation so that they only lift  about 10 grams.  This 
will solve your problems & make the action play  like butter.  As far as I 
can tell by they old & new examples I've  worke on personally, they have always 
done it this way. GO figure.
  Dale

   
Hi List,
I am trying to find out more about Petrof grand actions and what  appears to 
be a problem with their setting-up/geometry etc.  I recently  came across a 12 
year old large grand which has potentially very good sound  qualities but a 
lousy feel to the touch.  Whilst I need to go back and  carry out an in-depth 
inspection to make further judgement, my limited  experience of Petrof grands 
is that they generally have a question mark over  the touch.  There are some 
quite negative comments on the web,  particularly from a team from a music 
institution who tried out several  instruments.
Have any of you action geometry guys had experience of analyzing the  Petrof  
action and doing any re-thinking on it?   This  particular one is quoted as 
having a Renner action.
I would appreciate any leads on this before I venture quite a long  distance 
to see it again.
 
Thanks,
 
ric




 
 
Dale  Erwin--Piano Restorations
4721 Parker Rd.
Modesto, Calif 95357
Shop  209-577-8397
cell 209-985-0990 
_http://www.Erwinspiano.com_ (http://www.Erwinspiano.com)  Specializing in 
the Restoration,  Service & Sales of
Steinway, Mason & Hamlin, & other fine  pianos
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