Back checking Height and an incredible help

[Isaac OLEG]

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Hi !

Then why the tone is changing so much with changes in aftertouch (on
properly voiced hammers ?)

We check that the tails aren't rubbing so I don't believe it it the reason.

Again I believe a better energy transfer towards the action, and the same
effect occurs in verticals to some point.

Best
Isaac OLEG

Entretien et reparation de pianos.

PianoTech
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94400 VITRY sur SEINE
FRANCE
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  -----Message d'origine-----
  De : pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]De la
part de David Love
  Envoye : jeudi 29 mai 2003 10:08
  A : Pianotech; Richard Brekne
  Objet : Re: Backchecking Height and an incredible help


  My guess is that if the hammer is checking so high that the tail rubs on
the backcheck on the way up (just slightly) it will diminish hammer speed
and the volume will be thus diminished making it seem like it is the close
checking that is the cause.   Otherwise, I put this in Carl Sagan's "Demon
Haunted World".

  David Love
  davidlovepianos@earthlink.net


    ----- Original Message -----
    From: Richard Brekne
    To: Pianotech
    Sent: 5/29/2003 12:34:58 AM
    Subject: Re: Backchecking Height and an incredible help



    BobDavis88@aol.com wrote:


      Hafta say I ain't buying this. The excursion of the string is so
slight that I can't believe that an object 1/2" away could cause air to
offer much impedance. I'm willing to bet if I held my thumb 1/2" from the
string right above the strike point, no one could tell me when it was there
and when it wasn't, blindfolded.
    Cant say I blame you. Does sound a bit fantastic.... to put it mildly.
But next time you run into a grand that has obviously high checks you can
try this out.
    Take any old note...maybe say A4 :), get a sense for its volume and
compared with its neighbors. Run a few chromatics up and down. Then lower
its back check to exactly 2 mm under the tail at drop and listen again.

    See what you think. I dunno, maybe you wont buy it then too. Maybe its
like the proverbial green light at that last millisecond of sunset at
sea..... But I do know what I heard.

      Sorry I don't have something more positive to offer as an explanation
for optimal checking=louder tone. I'll be watching this space anxiously.
      Bob D

     RicB
    --
    Richard Brekne
    RPT, N.P.T.F.
    UiB, Bergen, Norway
    mailto:rbrekne@broadpark.no
    http://home.broadpark.no/~rbrekne/ricmain.html
    http://www.hf.uib.no/grieg/personer/cv_RB.html


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