WHAT IS HUMIDITY?
The idea of moisture in wood is often misunderstood. It is true that it is a much less noticeable
sensation than temperature. However, everyone can notice the condensation that is deposited on a
cold bottle straight out of the refrigerator. This is water vapour present in the air and becoming liquid
again on the cold surface. This capacity of air to absorb water is the property that dries our clothes!
The quantity of water air can absorb depends on the temperature: warm air absorbs a greater
amount of water than cold air.
Like air, wood contains water. In its green state, wood contains a large amount of water, often over
half its weight. During the drying of the wood, the water it contains evaporates. Once the wood
and air have reached the same level of moisture, there is a balance that stabilises the wood. If the
ambient air becomes more humid, the wood gets wetter. If the air becomes dry, the wood becomes
drier. This shows that the wood absorbs or returns the water into the ambient air according to the air
humidity level.
Air seeks moisture wherever it is. This is the classic problem of heating a home in winter. It is not
uncommon to have a moisture level of 23% in a modern house. This low value is comparable to that
found in deserts. Very dry air seeks to absorb water to regain balance. It acts as a powerful blotting
agent and absorbs water found in wood with the potential to cause great instability in your piano.
The age of a Yamaha piano can be found thanks to the serial number inscribed on the frame.
It is easily accessible by lifting the top lid. It is always the right of the piano, in the treble register.
You can use the vintage production Pianos Yamaha schedule guide.
TECHNICAL INFORMATION
1312 YAMAHA PIANO BUYERS’ GUIDE
WHAT IS REGULATION?
The piano action is a set of interrelated “levers”.
Constant playing over an extended period of time can wear the felt and leather parts in the piano
action. Similarly, expansion and contraction of wooden and metal parts because of humidity and/
or temperature change may also cause the levers to move out of alignment. As result, the piano’s
action can produce a slower response than normal.
Regulation is the adjustment of these levers to ensure the action continues to work responsively,
smoothly and in a uniform matter. This gives evenness of touch and performance.
WHAT IS VOICING?
Frequent playing may compact and compress the hammer felt. Subsequently this leads to hardened
and grooved hammerheads resulting in a loss of resilience, thereby producing poor tonal quality.
Voicing is the treatment of the hammerheads to improve or adjust the piano tone. It is an intricate
and highly specialised procedure of controlling the way the string vibrates by adjusting the density
of the felt in each hammer, and to some degree, the shape of each hammer. This type of service
requires care and expertise from the qualified piano technician as one wrong application can
damage the tonal quality of your piano.
CARING FOR YOUR PIANO
To find out more about the care we take in producing the entire Yamaha piano range, why not
download one of our Yamaha - The Key Advantage iBooks.