During the warmer months the atmosphere is quite humid and 'water laden' and the wood absorbs this and swells. The steel strings bear down on this soundboard through 'bridges' which in turn allows their vibrations to be amplified.ДЄtmospheric changes - Due to the very nature of the whole construction, pianos are very sensitive to atmospheric changes in temperature and barometric pressure. Spruce is used because of its elastic nature the more elastic the soundboard the more pleasant the tone. This board is made of spruce and is responsible for the resonance of the piano. Another primary cause is the movement in the soundboard. In older pianos, the primary cause of strings slackening is the tuning pins which are embedded in the wrest plank (or pinblock) become loose either due to general wear and tear over the years, or (more commonly) because the wrest plank has developed splits across or around the pin holes due to the wood drying out. When these strings slacken naturally their tension reduces and the piano then becomes out of tune Why do the strings slacken? The entire piano is under continual stress to a varying degree and it is the fluctuations in these stresses that cause the piano to go out of tune.Д¬onsidering the 230+ steel strings that are strained to between 150 - 200lbs each means the cumulative total on the iron frame, and the solid wooden 'back', are subject to stresses of between 18 - 20 tons. There are a multitude of factors which affect the tuning and the stability of a piano. Why does my piano go out of tune ? Keep your piano at pitch Service / Support Advice / Buying / Tuning.Piano Hire / Rental Long Term and Event Hire.

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