Ok, here's a question on how to do pitch raises (provided the piano can take 440:) Here's the methods I can come up with on how to do it -- can anyone point out any errors in my ways? up to 10 cents flat -- tune. 10 to 50 cents flat -- pull up with overpull, then tune (2 passes) 50 to 200 cents flat -- pull up to pitch, then overpull, then tune (3 passes) 200 to 400 cents flat -- pull to 1/2 step flat, then to pitch, then overpull, then tune (4 passes) 400 cents flat or more -- pull to 1 step flat, then to pitch, then overpull, then tune (4 passes) Or, is it... regardless of pitch (over 50 cents flat) -- pull to pitch (even if 500c flat), then overpull, then tune (3 passes)? --- Farrell <mfarrel2@tampabay.rr.com> wrote: > I'm surprised no one has questioned this post. > Terry, are you suggesting > that you did a one pass pitch raise with overpull > from 170 cents flat? If > you start in the bass, the treble would be even > flatter by the time you get > there, so you were likely raising the treble from > 200 to 250 cents flat. > That would require an overpull of approximately 75 > cents. I think most > opinion suggests that pulling a string more than > about 25 cents above pitch > may permanently damage the tonal qualities of the > string. > > In the future, with any piano more than about 50 to > 75 cents flat - and > certainly any piano 100 cents flat, you may wish to > consider a first pitch > raise pass only targeting pitch with no overpull, > and then a second pitch > raise pass (usually from 25 cents flat or so) with > appropriate overpull. > This not only helps to save the strings from damage, > but also gets your > rough tuning closer for the final tuning pass. > > Terry Farrell > > ----- Original Message ----- > From: "pianolover 88" <pianolover88@hotmail.com> > To: <pianotech@ptg.org> > Sent: Wednesday, January 09, 2002 9:48 PM > Subject: Re: Pitch Raise Experiment K&Cambell > > > > Did a HUGE pitch raise on a 60's Kohler & Cambell > spinet that was as much > as > > 170 cents flat. hadn't been tuned in more than 20 > years. Luckily, the pins > > and strings were surprisingly free of even a hint > of rust. Pulled it > > completely up to pitch in one pass, then fine > tuned. Also removed action > to > > take to shop for hammer filing/reshaping. Brought > it back, voiced it and > it > > sounded terrific! no broken strings, customer > elated! Fun job too! Of > > course, i informed the customer that her piano > will need a follow-up > tuning > > in 2-3 months to stabilize it. She gladly agreed. > > > > > > Terry > > > > > > > _________________________________________________________________ > > Send and receive Hotmail on your mobile device: > http://mobile.msn.com > > > __________________________________________________ Do You Yahoo!? Send FREE video emails in Yahoo! Mail! http://promo.yahoo.com/videomail/
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