Ahh Ha! I got an answer for you. "Why would you have any overpull at all at 88?" Ya don't. Example: Piano is 50 cents flat A0 to C88. Start pitch raise (PR) @ A0. Use about a 17% (or so) overpull for bass. Up from the bass break, use 25% overpull (of course now, the next string you PR will actually be starting from about 70 cents flat) for all tenor strings (a teeny tiny bit less for a few wound strings in tenor, if present). Start with a 33% overpull with the first treble tricord (the first ones will be about 70 cents flat to start). Continue with 33% overpull, remeasuring (more frequent remeasuring with an unevenly flat piano) at reasonable intervals (I find that by the last octave I might be starting with an 80 + cents flat string). The last few notes, I will not overpull quite as much as the SAT is suggesting. I turn the PR overpull off when I get to A#86, B87 or C88 (it's a critical calculation based on moon phase, earth's magnetic field polarity fluctuations, etc.) and maybe pull them a few cents sharp. The last unison on C88 gets NO overpull. I find that on 80%+ pianos that start off 50 cents flat or less, the above method will get me within 2 cents on 80%+ of the notes (less in hi treble) (I am estimating the percentages - but I don't think I am exaggerating too much - at least it seems that way ;-). In bass and tenor especially, I will often find a dozen center strings that I do not move on my tuning pass, and often find a good dozen or so unisons that I do not touch (not always, but often - of course more often on a 10-cent PR than a 50 cent PR). Of course, if my foot switch breaks and my auto-stepping goes crazy and sneaks to a point half an octave away and I gotta retune a whole bloody *&%$ half a piano AGAIN (after of course ANOTHER pitch adjust), I just give up. BUT don't ask, because I love my SAT III and I would never say anything bad about it. :-( Terry Farrell Piano Tuning & Service Tampa, Florida mfarrel2@tampabay.rr.com ----- Original Message ----- From: "Ron Nossaman" <RNossaman@KSCABLE.com> To: <pianotech@ptg.org> Sent: Saturday, September 09, 2000 12:38 PM Subject: Re: Pitch Raise Sequence > >Hmmmm. This is not my observation. The SAT recommended overpulls of 25% in > >tenor and 33% in treble generally work well for me. That would suggest more > >overpull in treble (larger pitch correction plus larger overpull). :-) > > Hmmmm again. I guess I really don't know what the actual overpull is in the > treble doing it aurally. All I have to go on is overpull relative to what > I've already overpulled an octave down, so I don't have numbers. The aural > process requires a progressive lessening of overpull (relative to an octave > down) as you go up the treble, ending with a very nearly pure octave at 88. > OK, I have a question. If you SAT pitch raise from the bass to treble, > tuning unisons as you go, why would you have any overpull at all at 88, > since the rest of the piano should be all nicely compressed and at pitch > and that last unison shouldn't knock the adjacent notes down appreciably? > Doesn't compute, unless I'm not understanding how the overpull estimate is > stated. > > > Ron N >
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