----- Original Message ----- From: "Roge Domeny" <rogerdomeny at att.net> To: <pianotech at ptg.org> Sent: Thursday, January 20, 2011 12:43 PM Subject: Re: [pianotech] A432 Tuning Fork > Jim is correct. They do not allow any devices with visual displays in the > exam room. I was allowed to keep my cell phone, but I assured them it > would > stay in my pocket while I was at the test piano. > > Make sure that you are using a test interval with coincident partials at > the > fundamental of A49, such as the F21-A49 M17 = F21-Calibrated Pitch Source > test, adjusting F21 to achieve a discernable beat rate if necessary. DO > NOT > use a test that has coincident partials at the second (or higher) partial > of > A49. For example, the F33-A49 M10 has coincident partials at A61, which is > the second partial of A49. Tests that rely on higher partials of A49 will > not be accurate because the inharmonicity that is present in the piano > will > not be matched by the pitch source. Learn to set pitch with a test > interval > that has coincident partials at the fundamental of A49 (such as the > F21-A49 > M17 test), and you will nail it every time, whether you use a fork or an > electronic pitch source. That is, as long as your pitch source is > accurately > calibrated. > > Roger Domeny > Domeny's Piano Service >
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