Pitch Raise Questions

[Kevin E. Ramsey]

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    David, that's good. I find that the bass needs about 20% overpull. =
When the machine finishes it's calculation it comes on at AO, right? I =
go up an octave to A1, look at the cents deviation, and measure how flat =
it is. Then I go to A2, which on most pianos is still on the bass =
bridge, and I measure how flat that note is. Then I do a quick =
calculation in my head to get the average cent value. Twenty percent is =
an easy figure to calculate. Say it's 32 cents flat; double that for a =
value of 64. Move the decimal point over one place and you have 6.4, =
which is twenty percent of 32. I adjust the machine to be 6.4 cents =
sharp, tune all the single strings and the non-muted bi-chords, pull out =
the strip and tune the unisons, and the bass will be dead on after the =
rest of the pitch raise process. (Of course, I always go through it a =
second time on the final pass, sheesh, I'm not a hack, after all.)=20
    Think about it, you might try it. Beats having the lights drift by =
an equal amount, but I know you've got your system too, and I respect =
that. This whole post was directly at the person who originally posted =
the question anyway.=20


Kevin E. Ramsey
ramsey@extremezone.com
  ----- Original Message -----=20
  From: David Love=20
  To: pianotech@ptg.org=20
  Sent: Monday, June 24, 2002 9:39 PM
  Subject: Re: Pitch Raise Questions


  Anything over 4 cents will require a second tuning.  I found with the =
SAT III (when I was using it) that the pitch raise function needs to be =
modified slightly to accomodate different areas of the piano.  The =
standard pitch raise function overpulls by about 25% (if I recall).  The =
bass and low tenor need only about 15% overpull and the upper treble =
needs about 30-35%, tapering off at the very top.  So when using the =
overpull function on the SAT III, let the lights rotate left slightly at =
the lower end of the piano, stop them in the middle, and let them rotate =
slightly right at the upper end.  You will end up much closer to your =
goal.  Tune unisons as you go.

  David Love

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