BUYING NEW
In general, if you find a reputable piano retailer, buying a new piano should be no problem. The choice of piano is yours, and the amount you pay will in general determine the quality of the instrument. When you find a piano that satisfies your needs, purchase the one you have tried, as another of the same make and model could be quite different in touch and tone.
BUYING SECOND HAND
Once again, buying from a reputable retailer should not be a problem, as the piano will have been professionally restored where necessary, and it should be covered by a warranty. However, beware of poorly restored pianos, or instruments with only 'cosmetic tidying up' sold as'fully restored'.
STRAIGHTSTRUNG OR OVERSTRUNG?
Straightstrung or Overstrung: In a straightstrung piano, the strings run parallel to one another throughout. An overstrung piano has the bass strings running diagonally across the piano, crossing over the treble strings - hence overstrung. Overstringing is preferable, as the strings are longer than is possible otherwise, and this produces a much better tone. If a straight strung overdamper piano is in good condition, it can be satisfactory.
OVERDAMPENED OR UNDERDAMPENED?
Overdamper or Underdamper: In an overdamper action, the hammers (the action parts which strike the strings) are obscured from view (when looking into the top) by a wooden rail holding the dampers (the action parts which press on to the strings to stop them from sounding). An underdamper action has the dampers located beneath the hammers and they are usually much more effective than overdampers.
SOUNDBOARD AND BRIDGES
Soundboard and Bridges: The soundboard is the varnished wooden panel which can be seen underneath the strings. The bridges are lengths of wood, glued to the soundboard, into which metal pins are driven. The strings run over the bridges and between the pins. The vibration of the strings is transmitted to the soundboard by the bridges, and this produces the sound you hear.
all information taken from http://www.pianotuner.org.uk
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