I do many P.raises each week as a floor tuner, tuning mosly newer and some older pianos. I ALWAYS enter the overpull % manually, and also re-enter, or at least check to see if more is needed as i progress upward into the treble, where it is almost always flatter. For instance, if f5 is 30 C flat, then I add a +10 C overpull. I NEVER let the SAT dictate the % of overpull as it is rarely enough, just as the stretch in the treble (as input from the FAC mode) is usually not enough, and I end up adding more stretch manually. Terry Peterson Associate Member PTG Los Angeles, CA >From: "Jim Coleman, Sr." <pianotoo@imap2.asu.edu> >Reply-To: pianotech@ptg.org >To: pianotech@ptg.org >Subject: SAT II pitch raises >Date: Sun, 03 Dec 2000 16:48:07 -0700 (MST) > >Dave and Terry gave good basic answers about SAT pitch Raises. I will >add my 2 cents worth here: > >It is not necessary to measure each note during pitch raise, this takes >extra time. With the SAT, one can do the PR in 10 to 15 minutes and have >the results close enough for a good fine tuning to follow. If the piano >is more than 50 cents flat and string breakage is a possibility, I use 2 >PRs, the first time, just to A440, the second time I measure the pitch >of three A's, taking the rough average of them as the one upon which to >compute the PR for A3. I use a temperament strip throughout the piano >and tune only the middle strings, finishing up with clearing the unisons >roughly for the plain wire notes. If one string is left slightly high, I >will deliberately leave the next one deliberately low. I only desire to >balance the tension during a pitch raise. When I use this "quick and >dirty" method, the entire tuning including the pitch raises takes no >more time than an ordinary fine tuning. > >During the PR's the hand learns the tuning pin torque fairly well and >is able then to do a better tuning on the final pass. > >Just a note of caution when doing the rollover technique from MSR to SHIFT; >If you hold down the MSR button too long, it will not know that you >intend to do a pitchraise calculation and may measure some extraneous >sound in the room and give you weird results. So, once you have measured >the pitch drop, press the MSR button and quickly press the SHIFT or Green >SHIFT button quickly, release the MSR button, then release the SHIFT >button. >Just before you release the SHIFT button, you will notice the offset >amount in the right window. If you used the 25% overpull (MSR-BlueSHIFT) >the amount in the window should be approx 25% of the amount of flatness >which you had measured on the chosen sample note. Of course, one COULD >measure each note as some others prefer, but the results versus time are >not worth it in my opinion. > >My personal preference is to sample the treble only once or twice and >then after tuning the unisons, the Bass is tuned by ear to match >wherever the Tenor section fell. I can tune the Bass faster by ear than >with the machine. Whatever small variations you may find after the PR >are easily and stably corrected during the fine tuning. > >The SAT III processor runs at twice the speed of the previous models, so >it is important to do the rollover technique quicker to avoid picking up >odd sounds which could skew the results. > >Doing fast pitch raises helps develop hammer technique in both speed and >accuracy in the long run. > >Jim Coleman, Sr. _____________________________________________________________________________________ Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com
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