Well, OK, but I was actually replying to David Nereson as to why, after inputing the FAC numbers, his A4 was reading slightly flat. William R. Monroe On Tue, Aug 4, 2009 at 9:43 AM, David Ilvedson <ilvey at sbcglobal.net> wrote: > Yes, you missed something...I'm offsetting the pitch, i.e A4 will not be > A440. The FAC numbers are entered and stored on a page of memory. At > that point I offset the pitch, then pull up the page for that piano... > > David Ilvedson, RPT > Pacifica, CA 94044 > > > >David, > > >Don't forget that after you've offset the pitch, you've then gone through > >the FAC procedure which requires you to tune A4 at it's second partial > (A5) > >and then read it at A6 to get the A offset. In other words, you've > changed > >that A4 that you measured to offset pitch when you established the FAC > >numbers. So, the fact that A4 is now flat is because you've changed it > from > >where it was, no? Did I miss something? Hope that helps. > > >William R. Monroe > > > > >On Mon, Aug 3, 2009 at 3:41 PM, David Nereson <da88ve at gmail.com> wrote: > > >> First of all, I did call Inventronics about this first, but just > couldn't > >> seem to get "on the same page." > >> This time of year, most pianos are sharp from summer humidity. Rather > >> than lower them all down to A440, knowing they'll need a pitch raise in > >> November if I do, I just tune them sharp. This requires offsetting the > SAT > >> to a sharper pitch. > >> Following the outlined procedure in the instruction manual, I turn the > >> unit on, press Tune, then play A4 on the piano, then press the Cents Up > >> button on the SAT (III) until the lights stop, then press Shift, Reset. > The > >> unit should now be offset to the higher pitch. Then I go ahead and > measure > >> the SAT numbers and store them to a page in memory. Before starting in > to > >> tune, I go to A4 on the SAT and play A4 on the piano to make sure the > lights > >> are still stopped, i.e., that the unit is offset to the pitch of A4. > >> Here's the problem: the lights are never stopped at A4 after > performing > >> the offset. They're always rotating counterclockwise, indicating that A4 > is > >> flat! Well, I don't want to raise the piano any sharper! Why, after > having > >> supposedly offset the unit's reference point, does it still show A4 as > flat? > >> Should I have A5 or A6 in the window when I offset? (I've tried both, > and > >> it doesn't seem to make any difference.) The guy at Inventronics said to > >> "drop down a couple cents," or to "leave off a couple cents" or > something > >> like that, but I'm not sure what he meant. > >> In reality, I don't raise the whole piano to the sharpness of the low > >> tenor, which is usually the sharpest area of the piano. I'll lower the > low > >> tenor some, leave the treble where it is, and maybe pull the bass up a > tad. > >> On older pianos, I don't like to have to pull the bass up ANY, because > of > >> possible string breakage, but if I don't then I have to lower all of the > >> tenor and treble, and do a pitch raise when November comes along. And > these > >> school systems don't want to tune more than once a year if they can get > away > >> with it. > >> But I digressed. Why don't the lights stand still after having > >> supposedly offset the pitch? > >> --David Nereson, RPT > >> > >> > >> > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20090804/9d96a909/attachment.htm>
This PTG archive page provided courtesy of Moy Piano Service, LLC