[pianotech] Interesting action on Yamaha YUA

[Ed Sutton]

Ryan-

As you play more and more softly, every action reaches a failure point where the response becomes erratic, so there is a limit on how quietly you can play dependably. Alexander and I are wondering if this action is different from a standard Yamaha vertical action in this respect. Perhaps it repeats faster at a cost of less pianissimo response range?

The purpose of weights in the back of vertical keys is usually to get the key back down so that the jack can reset. If you add keyweight to increase touchweight, you are pumping lead that doesn't do anything to the overall action response. If you add a small amount of weight to the hammer, it will increase the dynamic touch of the piano, and perhaps improve the sound as well, even thoughj the static downweight will still measure low.

Ed
  ----- Original Message ----- 
  From: Ryan Sowers 
  To: pianotech at ptg.org 
  Sent: Tuesday, July 07, 2009 6:12 PM
  Subject: Re: [pianotech] Interesting action on Yamaha YUA


  It does have a very light touch. I just took some downweight measurements and it's around 43-45 grams. Upweight is around 23 grams so the friction is around 10. I'm contemplating adding some weight at the back of the keys but I kind of like how it plays. If somebody is looking for a light action this would be the one. 

  Alex: I don't understand your analogy to the grand action and feeling of lack of gravity. When you refer to spring tension being neglibible, do you mean the hammer return spring or the jack spring?


  On Tue, Jul 7, 2009 at 10:49 AM, Alexander Lass <lasspiano at gmail.com> wrote:

    Ed,

    This is the first question that came to mind when I saw the design.  To make it analogous to a grand action, I think the feeling would be similar to not having any gravity acting upon the hammer assembly until the point of let-off.  Perhaps the spring tension is such that any sensation is negligible, but it does pose an interesting question.

    Ryan, any thoughts?

    Alex


    On Mon, Jul 6, 2009 at 9:38 PM, Ed Sutton <ed440 at mindspring.com> wrote:

      Ryan-

      What is the effect on pianissimo playing?

      Ed Sutton



  -- 
  Ryan Sowers, RPT
  Puget Sound Chapter
  Olympia, WA
  www.pianova.net
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