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Piano accordion tuning

Hello Garry. Do you want to evaluate the tuning or tune a specific accordion? You may get better answers if you include more information and post on either the “How do I …?” or the “Accordion Chat” sub forums.

I’m an accordion beginner, far more versed in the piano. To see the calculated frequencies you can do a google search for something like “frequency chart of musical notes” or search for one of the note frequency calculators. But if you want more, I suspect tuning the accordion is somewhat similar to the piano where the notes are not necessarily tuned to the exact calculated frequency, for example they may be “stretched” on the high and low ends of the instrument. And depending on the instrument and your preference, identical notes in different reed blocks may be even be detuned somewhat on purpose.

If you want to work on the instrument yourself there is a lot of information on the accordionrevival web site, including this page specifically on tuning, maybe it will help:
 
The main issue is that accordions are tuned to several standard pitches - the frequency of A4 (A above middle C)
Historically the tuning ranges from about 439 to 443 Hz, with 440Hz being the 'modern standard' (but not always used).

To know how to tune it you're going to have to work out what the original A4 tuning was, or decide what you now want it to be.
You can do that by measuring the current tuning (both pull and push) and using a spreadsheet (or maths software) to fit a cuve to that given frequencies rise exponentialy.

Or you could just measure A4 and hope it's still fairly in tune.
 
New to the forum
Hi Garry,
Tuning an accordion isn't as simple as it looks.
It's not like turning a guitar or a piano.
It involved the destructive removal of infinitesimal amounts of metal from, often, inaccessible places: you can do a lot of damage in a short time. ( And that's just the beginning!)
Unless you want to take up accordion tuning as an art or an occupation, you may be better off getting some professional help .🤔🙂
 
In the equal tempered schromatic cale, each consecutive note is the 12th root of 2 times the previous lower pitched note. for example C# is the 12th root of 2 times the pitch of adjacent C.
 
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