Piano Pitch Raises are used to bring your piano up to concert pitch A-440 tuning. If you haven't had your piano tuned regularly and would like your piano to play in concert pitch you may be in will need of a pitch raise. Chicago Piano Tuner has performed many pitch raises and has computer programs which help to determine the proper pitch raise. Pianos are intended to be tuned at A-440, a standard pitch, and if the piano hasn’t been kept in tune regularly, then over time it will gradually slip in pitch. Once this happens, the strings will need to be tightened back to their proper tension before the piano can be fine tuned. We call this process a “pitch-raise”.
Generally, a tuning after a "radical" pitch raise will not be quite as stable as a tuning on a piano that was only slightly out of tune. This is one reason to have your piano tuned regularly every 4-6 months. I do warn customers that there is always a chance with older pianos that strings may break. However, it is usually true that the strings will break in these pianos when the pitch is changed at all - not just during a pitch raise. Piano wire can become brittle after many decades, and any change in tension can cause it to break.