> I thought the stretch numbers would vary depending on piano and/or scale design. < Absolutely >The person who sold me the SAT has over 90 different stretch tuning pages that have different deviations. < Yup, different pianos, different scales, different FAC #s, different stretch tunings, different deviations. >Wouldn't numbers also differ due to human error, such as imperfect tuning of unisons while in FAC mode, and/or not COMPLETELY stopping the light dots?< Well, one given piano should yield the same FAC #s (or very nearly so) when measured by different skilled technicians. One typically measure an inharmonicity value on only one string at a time because any one string from the same set of unisons can vary in its inharmonicity characteristics (ideally all three unisons would be the same for any given note, but not in the real world - this is why Dr. Sanderson suggests that for more accuracy, one may wish to measure three F #s and average them together, three A #s and average them together, and three C #s). >These may be silly questions, but I'm still learning.< Never silly, but studying the manual thoroughly is imperative to operating the SAT properly. >Also, could some SATs be in need of calibration? < You bet! Every time you turn the SAT on, you check the calibration. Press ON and make sure the lights are absolutely still - press CENTS UP or DOWN until the light pattern is absolutely still and then tune away - you are calibrated. If you are ever uneasy about your calibration, just get the 'ole fork out! Good Luck! Terry Farrell Piano Tuning & Service Tampa, Florida mfarrel2@tampabay.rr.com ----- Original Message ----- From: <pianolover@worldspy.net> To: <pianotech@ptg.org> Sent: Monday, January 31, 2000 12:39 AM Subject: Re: SAT FAC numbers > > Terry > > > On Sun, 30 January 2000, John Ross wrote: > > > > > Hi Terry, > > I used a SAT with FAC to get the figures I sent. (-11.2 and +21.4) > > When I used my SAT lll, I get -19 and +22.0, like you. I mostly use my SAT > > lll, > > the SAT with FAC is the one in my shop, which I used. > > I guess it needs a check up. > > Regards, > > John M. Ross > > Windsor, Nova Scotia, Canada. > > ----- Original Message ----- > > From: "Farrell" <mfarrel2@tampabay.rr.com> > > To: <pianotech@ptg.org> > > Sent: Sunday, January 30, 2000 8:09 PM > > Subject: Re: SAT FAC numbers > > > > > > > Woohhhaa! What is going on here? I punched in the three FAC numbers on > > both > > > my SAT I (FAC-equipped) and SAT III and got A0=19.0 and C8=22.0. This is > > > different from the previous two posts. How on earth can we be getting > > > different results? Is this the state of AccuTuner use? Am I doing > > something > > > wrong? Please reply prior to my heart attack. Thanks......Argh! > > > > > > Terry Farrell > > > mfarrel2@tampabay.rr.com > > > > > > > > > ----- Original Message ----- > > > From: "John Ross" <piano.tech@ns.sympatico.ca> > > > To: <pianotech@ptg.org> > > > Sent: Sunday, January 30, 2000 3:39 PM > > > Subject: Re: SAT FAC numbers > > > > > > > > > > Hi, > > > > I tried your FAC #'s and I don't get your results. > > > > Are you sure you are stopping the lights with the SAT set to F5, then > > > > changing the octave to F6, and stopping the lights with the cents > > button? > > > > Stop the lights on A5, change octave to A6, then use cents button. On > > the > > > > C6, stop then change to C7, and stop with the cents button. > > > > When you set the SAT to A4, it is actually reading A6, this is where > > your > > > > didcrepancy is coming in. I think if you tune it and check it with the > > SAT > > > > on page 0, and A4,it would show you the lights as being still. > > > > I get A0 -11.2 and C8 +21.4, using your #'s. > > > > Regards, > > > > John M. Ross > > > > Windsor, Nova Scotia, Canada > > > > > > > > ----- Original Message ----- > > > > From: <pianolover@worldspy.net> > > > > To: <pianotech@ptg.org> > > > > Sent: Sunday, January 30, 2000 3:43 PM > > > > Subject: SAT FAC numbers > > > > > > > > > > > > > hi all, > > > > > > > > > > > > > > > I just bought a used SAT II which has the FAC feature, > > but > > > > I'm a > > > > > little stumped. I set and stored my 3 FAC stretch > > numbers. > > > > After > > > > > that I strip muted my piano (Baldwin 40" console), and > > when > > > I > > > > got > > > > > to A4, I noticed the cents deviation was 5.8! Souldn't A4 > > > > ALWAYS > > > > > be perfect at 440? So I went back and re-entered the FAC > > > > again, (i.e., > > > > > tuning one string of A4 while the SAT is at "A5 and Zero > > > > cents", > > > > > the up 1 octave to A6 on the SAT, then playing A4 again, > > > but > > > > stopping the > > > > > dots with the cents buttons) but each time, A4 was > > > diviating > > > > about > > > > > the same amount: 5.8 cents sharp. Is this to normal for > > a > > > > stretch > > > > > tuning? Can I adjust the SAT to 0.0 at A-4 WITHOUT > > throwing > > > > all the > > > > > other calculations for the stretch out of whack? BTW, my > > 3 > > > > stretch numbers are: > > > > > F3= 17.1 > > > > > A4= 5.8 > > > > > C6= 3.6 > > > > > > > > > > -16 @ A0 to +32.4 @C8 is the low/high stretch. > > > > > > > > > > > > > > > Thanks. > > > > > > > > > > Terry > > > > > > > > > > > > > > > ______________________________________________________________ > > > > > Get free Internet service and email at http://www.worldspy.com > > > > > > > > > > > > > > > > > ______________________________________________________________ > Get free Internet service and email at http://www.worldspy.com >
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