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Music 01
Music 01
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Tuning

Find out about pianos and piano tuning here!

Sound

Pitch

A440

Tuning

Types of tuning

How often should a piano be tuned?

Why does a piano go out of tune?

Caring for your piano and prolonging a stable tuning

Professional cleaning

 

Sound

The musical tones of a piano are produced by felt-clad hammers striking steel wires (strings), which are stretched tightly over a wooden structure called the bridge, which is fixed to the soundboard, which in turn amplifies the sound. Typically, in the low bass, the tones are produced by single strings. (monochords) The middle bass section has two strings per note (bichords), and the treble normally has three strings per note (trichords). The felt-clad hammers, referred to earlier, are an integral part of the action (our word for the mechanism between the keys and the strings). The action is a very complex subject, and one I do not propose to cover in this document but, put simply, the action changes the simple downward stroke of the key, and converts it to a very controlled swing of the hammer.

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Pitch

To produce the different pitches, the strings vary in thickness and length. The Bass strings are long and thick, and the Treble strings are short and thin. In addition to thickness and length, the last variable in the equation is the tension which is applied to each string. The strings are anchored at one end and coiled around a special pin, which we call the "Wrest Pin" or" Tuning Pin". This pin can be turned up or down by the tuner, and adjusts the tension on the string. As the tension on a string increases so it vibrates more quickly, and the pitch is raised. Conversely, as the tension is lessened, so it vibrates more slowly, and the pitch is lowered

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A440

We often hear musicians mention A440, but what does it mean? The "A" refers to the note "A" above middle "C", and the 440 indicates that the string producing that note is vibrating at 440 Hz. (Hertz - cycles per second). This is the standard pitch for this note in Britain today, so if you want to play your piano with the radio, or play along with other instruments, it might be a good idea to ask your tuner to tune your piano to British Standard Pitch. See also Pitch raising or lowering

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Tuning

Tuning is a procedure whereby the string tension is adjusted so that every string is vibrating at the correct frequency, hence producing the right pitch to conform either to a concert standard i.e., A440 or in relation to the other strings if the piano is not tuned to British Standard Pitch.

On first seeing a piano, the tuner will determine what type of tuning is required. This will depend on the overall condition of the piano, the status of the existing tuning and the customer's wishes. The overall condition of the piano is checked to see that the strings, wrest pins, wrest plank (this is the plank of wood into which the wrest pins are driven), soundboard, bridges, keys and action are all in good order. From this examination the tuner will know if a tuning is possible, and if so, what kind of tuning the piano will sustain.

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Types of tuning

Fine-tuning:

This type of tuning is fairly self-explanatory. This is where the tuning pins only need a slight adjustment to put the piano in tune. This procedure takes from about forty minutes to an hour.

A fine-tuning is performed when the piano is tuned at a regular interval of about 4 - 6 months. this is the best way to have your piano tuned, because the tuner doesn't have to turn the tuning pins very far. The piano will stay in tune much better than it would if the instrument were left a long time, and the tuner needed to turn the pins a long way.

Rough and fine-tuning:

When a piano has been neglected, it is often necessary for the tuner to tune the piano twice before a quality tuning can be achieved. The first rough tuning prepares the piano for the second fine tuning. The need for this double tuning is due to the nature of piano wire. Suffice to say, if the tuner attempted to tune such a piano in one stage, the resulting tuning would be very unstable.

Pitch raising or lowering:

I'll offer a couple of examples to explain raising or lowering the pitch of a piano using two fictitious characters.

Example 1. Jenny's piano is in tune, but is nearly a semitone below, A440. so she can't play along with the radio or join in when her friends bring their instruments round for a musical evening. She asks me to tune it to British Standard Pitch, A440, and, having first inspected the piano to see if it can sustain the higher pitch, I would give her my opinion of the likelihood of success in the form of a percentage, for example, "There's an 80% chance of success with no broken strings or other problems". I would have to advise in this manner, as there are no guarantees. All reputable piano tuners are trained to minimise string breakage, but occasionally a string will break, even during a fine-tuning, and, of course, as raising the pitch puts more tension onto a string, the risk of broken strings increase slightly during a pitch raise. Having discussed the pros and cons with Jenny, a decision would be made whether to go ahead with the work or not.


Example 2. John's Victorian piano is incapable of sustaining British Standard Pitch, so he asks me to tune it down so that the note "A" plays "G". In this way he could play along with a recording of music by transposing the piece, whereas before, whatever he tried to play along with resulted in hideous discord. As with Jenny, I would examine the piano and discuss the pros and cons with John, and a decision would be made.

So what could Jenny and John expect to happen if an alteration of pitch was agreed? The procedure for either a pitch raising or pitch lowering is very like a rough and fine-tuning in that it requires two tunings to achieve a decent result. In addition to the double tuning, which is normally done in one session, it is highly recommended that the piano be tuned again in a month's time, just to settle the piano and work for a quality tuning. Thereafter, it is very important to have the piano tuned regularly to ensure that the pitch does not drift so far as to make another pitch raising or lowering necessary.

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How often should a piano be tuned?

Deciding how often a piano should be tuned depends on its condition, it's location and, to some extent, what use you make of it. I usually advise a schedule of tuning based on this information. Most of my clients have their pianos tuned every six months.

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Why does a piano go out of tune?

Pianos go out of tune because of the following factors:

 

Changes in humidity are the main factors in sending a piano out of tune. Ever since its invention in 1709, the piano has been constructed mainly of wood. this material gives the piano its unique tonal qualities, but being wood it tends to take in moisture when the atmosphere is humid, and gives it up again during a dry spell. In doing this the wood expands and contracts. If you consider that the strings are stretched over the bridges and soundboard, it follows that if the soundboard expands during a humid spell, the strings will be pushed up and so will the pitch. Then, when the atmosphere is dry, the soundboard will give up it's moisture and so contract, lessening the push on the strings, and therefore the pitch will drop.

Changes in temperature will contribute a little to the instability of the tuning, but are not nearly as great as the effects of humidity changes.

Piano playing will have a small effect on the stability of the tuning. Exactly how much will depend on the condition of the tuning pins and strings.

New pianos may tend to go out of tune quite frequently for the first few years. This is because the strings are new and have a natural tendency to stretch. however, this will pass and, provided you have the piano tuned regularly, this should not be a big problem.

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Caring for your piano and prolonging a stable tuning.

Here are some suggestions on piano care. If you follow them to the best of your ability, it should reduce tuning instability and the instrument may need less frequent repairs.

POSITION

It is VERY IMPORTANT to correctly position your piano within your home.

Position your piano:

 

Central heating can damage your piano

IMPORTANT If you have, and use, central heating in the room housing the piano, seek the tuner's advice. He may recommend the use of a humidifier, or other steps to avoid irreversible damage caused by a dry atmosphere.

Damp conditions can damage your piano

IMPORTANT If the room housing the piano is at all damp, seek the tuner's advice. He may recommend the use of a special piano heater to protect the piano from excess moisture, which can cause serious damage if allowed to go unchecked

CLEANING

Follow the manufacturer's instructions when available.

Avoid spray polishes as they can, in some cases, break down the traditional polished finish. It's best to use the more traditional wax polishes. If in doubt, ask the tuner. Most tuners can also advise about cleaning keys. They can supply special polishes and preparations for cleaning casework and keys. Cleaning inside the piano is best left to the tuner/technician (see professional cleaning).

GENERAL

Avoid using the piano top as a shelf because heavy items accidentally falling onto the keys may cause a broken hammer, or chip the key covering.

to avoid damage to the casework, or accidental spillage, Do not place drinks or vases on the top of the piano. Spilled liquid that may seep inside the piano can cause a lot of damage which can be expensive to put right.

Only fully qualified piano technicians should carry out piano repairs. NEVER attempt a repair unless you are qualified to do so. Not only do the professionals have the experience, they also have the specialist tools.

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Professional Cleaning

Over the years the inside of your piano will attract a lot of dust and grit. A continuous build-up of this kind can cause excessive wear and tear of the felts, effectively shortening their useful life.

So what can be done to keep your piano clean inside?

Do not attempt to clean the inside of your piano unless you are trained in piano maintenance.

Having your piano tuned regularly will help, as most tuners carry a duster and will normally give accessible surfaces a wipe over. However, every five years or so you should consider having the interior of your piano professionally cleaned. This involves a thorough cleaning of the interior of your piano even extending to inaccessible places such as underneath the keys and under the strings.

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