It's interesting to hear someone else talk about spending more time in the pitch raise sometimes than in the final pass. I have also found that sometime I can get through the final pass faster than the pitch raise if I am fairly careful doing the pitch raise/or pitch lowering. My pin setting during the pr is basically just going slightly above the pitch I want, and making sure I feel the bottom of the pin move in the block, and then easing it back down to the desired pitch. I am experimenting between fast and sloppier pitch raises versus careful ones to see which I really like best in terms of time and final accuracy. Bob Hull --- "pmc033 at earthlink.net" <pmc033 at earthlink.net> wrote: > David: > Since different techs use different pin setting > techniques, it's hard to say exactly how much over > pull will work for every situation. During the last > few weeks, there was a discussion of overpull > percentages with RCT users. Some had to adjust the > overpull because their pianos were coming out too > sharp using the default percentages. > For years, I had been using my SAT for pitch > raises using the single string method described in > the SAT manual. That is, doing the unisons at the > end. I would pull the bass 25%, and mentally > calculate the rest of the string overpull at 30%. I > would carefully set the pins as close as I could. > After pulling the unisons in, I would end up sharp > in the low tenor, less sharp in the rest of the > tenor section, and the treble came out ok. I used > to reduce the overpull in the tenor accordingly > (lots of mental gymnastics here). It seemed to work > for me. > Then, I got the Pocket RCT, and began doing > unisons as I went along. I found that doing this > produced a more accurate result. After a few months > of PRCT, I went back to my SAT and began using the > string by string method. The result was that my SAT > pitch raises began to come out much closer to pitch > than before. Since the SAT has a default 25% > automatic overpull, I use that in the bass. In the > low tenor, I use 25% also, maybe adding a few cents > more (maybe closer to 28% overall). Starting in the > treble, I go back to 30% for the rest of the > strings. > I spend much more time in the pitch raise than > the final pass because I find that the result is > much closer if I do that. If I spend less time on > the pitch raise, not being as careful, I have to > spend more time on the final pass. I do set the > pins while pitch raising. > Doing the unisons string by string may seem > tedious (which is why I resisted doing so for > years), but the result is more accurate in my > experience. YMMV. > Just my $.02. > > Paul McCloud > San Diego > > > ----- Original Message ----- > From: David Nereson > To: Pianotech List > Sent: 07/09/2006 4:58:54 AM > Subject: RE: post pitch-raise creep? > > > > -----Original Message----- > From: pianotech-bounces at ptg.org > [mailto:pianotech-bounces at ptg.org]On Behalf Of > Farrell > Sent: Friday, July 07, 2006 6:04 AM > To: Pianotech List > Subject: Re: post pitch-raise creep? > > > Doesn't sound right. When doing the PR, are you > using an ETD? > > Only to measure the amount it's flat and to tune the > initial A4 sharp by 40% of the amount it was flat. > > Unisons as you go? > > No. All the middle strings, then all the unisons, > then the bass, which sometimes needs very little > raising. I can do it fastest that way. > > 41% is very large percentage for overpull. Most > ETDs recommend between 20% and 35%, depending on the > area of the scale. > > And I say that's usually not enough. If it's 20 > cents flat, half of that (50%) is 10 cents, and a > third of that (33%) is about 7 cents. So I pull A4 > halfway in between those numbers, or about 8 1/2 > cents sharp, which is roughly 40% of the amount it > was flat. (I notice in other posts, some tuners use > up to 37% in some areas of the piano.) Then I do > the pitch raise, all the octaves, then all the > unisons. Almost every time, A4 ends up right on > 440, and the rest of the rough tuning is very close. > So I go ahead and do the tuning (fine tuning). > It's after I'm done with the fine tuning, when I go > back to check for anything that has slipped, that I > find the middle of the piano and the low tenor has > crept sharp by a beat or even two. > > Immediately after the PR, do you check the middle > section for pitch? > > Yes, and it's almost always right on 440, so I > proceed with the fine tuning. It's after the fine > tuning that I find it has crept sharp in the middle. > The low tenor is also quite sharp, so now I leave > that area a bit flat during the pitch raise. And > during the tuning (fine tuning), the SAT always > seems to "tune" the bass too flat, even if the bass > didn't need a pitch raise. > > If it is at or near target, there is no reason for > it to creek up. > > One wouldn't think so. > > How large a pitch gain are you talking about? > > Anywhere from just a few beats flat to a half-step > flat. > > I've never noticed such a phenomena. > > That's "phenomenon." Phenomena is plural. (Just > for your own info.) > --David Nereson, RPT > > Terry Farrell > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
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