To Pitch Raise or Not to Pitch Raise
It is an interesting case for a piano tuner to ponder. A pitch raise is usually a quick preliminary tuning in which the piano is brought up to pitch A=440 hz in a rough fashion. The tuning is done quickly so that the tension the strings exert on the sound board is evened out. After the pitch raise, the tuner must then do a proper tuning and he is able to do that because the strings are closer to where he wants them to be. It is certainly not the best scenario. The fact that the piano is in need of a pitch raise means that the piano has not been maintained. The piano is essentially used to being out of tune. That has become it’s natural state. Suddenly the owner now wants the piano in tune and so the tuner is fighting an uphill battle. He is trying to change the natural state of the piano. The tuner is trying to change the pianos habit of being out of tune.
The other difficulty with pitch raises is that strings may break. A tuner can usually tell before he exerts too much pressure on the tuning pin that the string is on the verge of breaking. If this happens the tuner has no choice but to leave that string well enough alone.
The other option to a pitch raise and the one I usually suggest is that the piano be brought up to pitch slowly over the course of 3 or 4 tunings. The piano will still be in tune with itself but may be unable to be played with other instruments. In this way the piano has time to adjust to it’s new tension. The tuning never comes as a shock and so it tends to stay in tune longer.
Conclusion: A rapid pitch raise can be done but the piano will have the tendency to want to go back to it’s natural state of “out-of -tunedness”. On the other hand, a piano can be slowly brought up over the course of 3 or 4 tunings and will maintain its tunings throughout until it reaches A=440.