[pianotech] pitch raise

[Floyd Gadd]

Using Tunelab Pocket, I overpull 15% in the bass, to a maximum of 5 cents, 25% in the midrange and 32% in the treble, with a maximum overpull of 25 cents in both these ranges.  I've done a couple of pianos in the past few weeks that were more than a semitone flat.  In these cases, I simply set an offset of 5 cents in the bass and 25 cents in the rest of the piano, and didn't bother to measure individual notes for overpull.  I find it interesting how much of many of the notes end up very close to the final target, even with such an unrefined initial pass.
Floyd Gadd
Manitoba Chapter
Original message.
I have tuned pianos that were a hole step flat.   I don't think I would like to pull them a third that over 440.   Just my feeling"  I usually go about ten or 15 beats over.

William



  ----- Original Message ----- 
  From: pianolover 88 
  To: pianotech at ptg.org 
  Sent: Saturday, December 12, 2009 7:57 PM
  Subject: Re: [pianotech] pitch raise


  Pretty basic stuff. When pianos are pitch raised, they will typically drop by about 1/3 of the overpull. So if a piano is 100 cents flat, you would want to raise pitch about 33 cents past A440, since it will drop about that much after the PR. I find that bass strings typically drop far less than rest of the piano, and so they don't require as much overpull.

  Terry Peterson
  Accurate Piano Service
  UniGeezer.com
  "Over 50, and not "2" Tired!" 
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