This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Hi Bob, Thats what i do also first. (A4-F2, 2 8aves +m3rd) I proceed then with the sixth F2-D3 to the same beatrate, what is = resulting in a pure 12th in D3-A4. Spacing this 12th equally results the P12 tuning. regards, Bernhard ----- Original Message -----=20 From: BobDavis88@aol.com=20 To: pianotech@ptg.org=20 Sent: Friday, August 20, 2004 8:52 AM Subject: Re: setting pitch with a fork "I strike the F below the A and listen to the fork A along with the = F. I count those beats. Then I remove the fork and play the F and the A = and count those beats. " I don't know if the writer really meant literally "the F below the A", = but I also saw a reference in another post to a "F2-A3" comparison with = the fork, so I just wanted to make it clear that although F2, F3, and F4 = will all beat against A4, only the F2 [2 8ves + M3rd] will give an = accurate comparison between an A4 fork and the A4 note on the piano. = Here's why: The 5th partial of F2 is approximately equal to the fundamental of A4. = In a tuned piano, it will be about 4 beats flat of both the fork and the = note, but it can be set anywhere comfortable. I like 5 or 6 beats even = better. When A4 on the piano is in tune with an A4 fork, the beat of = either against the F2 beat-producer note will be the same. This is such = a great method because, even as the notes become in tune, the beats = remain in a comfortable range [4 to 6/sec] in which the ear is amazingly = adept at comparison. On the other hand, in trying to match a note = directly to a fork, the closer the match, the slower the beat. And, it = never becomes completely clean, because of beating between harmonics of = the source and "inharmonics" of the piano. Just last Saturday, our = Chapter set an A as a group by the F2-A4 method, and were very quickly = able to agree on a setting which we then measured electronically as = being only 0.2 cents off. That's not bad. By the way, we used an = AccuFork. We had a grand with a sostenuto, which you can use to hold = down the F2, but I also demonstrated playing it and jamming a mute = between it and F# to hold it down, then tuning the A4. The 5th partial of ~F3~ on the other hand, is ~A5~, which matches the = desired A4 at its SECOND partial, A5 [a 5:2 match]. The A5 produced by = the fork is harmonic, but that produced by the piano is a little sharp. = Matching this coincidence causes the piano's A4 to be slightly flat. = F4-A4 [a 5:4 match, coincident at A6] would produce an even flatter A4, = with equal beats between the fork and piano. I hope that's clear. We're probably all on the same page, but I just = wanted to make sure everyone out there knows why only F2 works = accurately. Bob Davis ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/b6/8f/b3/2b/attachment.htm ---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC