This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Hello All, the energy of the hammer returned to the backcheck and the energy of the = key to the keyframe become synchronous with the said 2 milimeters. If = this two blows are synchronized, there is a higher pulse wave running = through the instrument giving more additional energy to the string than = when this two blows are time offset (and may cause phase losses when = reaching the string). As a second effect of this two blow synchronization at the 2 milimeters = s that the player gets the impression when he reach the key bottom (what = produces a reaction force on his finger) and the blow of the hammer = backcheck (what produces also a reaction force on his finger) that he = touches the string with his fingertips what gives him more inspiration = while playing. kind regards, Bernhard Stopper ----- Original Message -----=20 From: antares=20 To: Pianotech=20 Sent: Monday, August 16, 2004 9:36 PM Subject: back check, a magical mystery tour. Hello List, Avery, Stephane and Richard, I have written about this mystery issue before a long time ago. I = personally have no explanation for it. I just learned this from a very gifted Japanese teacher. he introduced = me to "the one and only right position" of a back check versus hammer = tail. According to him (Tsuji-san), there should be a space of 2 mm after = drop between hammer tail and back check. Indeed that is true, and it is a mighty weapon. Throughout the years, there have been many miracles described on this = list to improve tone and action. If we delve into all what has been said, we must come to the = conclusion that, to achieve the very best in regard to the way an action = performs and to get the ultimate outcome...the tone, our profession is = extremely complex. The mystery of the back check has not been solved yet. I have as of = yet not heard an explanation that totally convinces me. Nor was = Tsuji-san able to explain it to me. A very powerful regulation is one thing, to make a fantastic tone = another. Among the weapons we are able to employ are :=20 1. Our experience, talent, knowledge and understanding first of all 2. The use of high quality materials like : the best felt and the best = front punching (indeed heavily underestimated) 3. A thorough understanding of the use of anti-friction material, and = what it really means 4. The ability to make a superb concert tuning 5. The ability to bring a voicing to a high standard. As described above, the back check height belongs to this list. It is = a very handy help in the voicing process. We start this process with the usual list, like anti-friction = treatment, regulation, tuning and voicing, but we can improve the final = outcome with the help of this back check phenomenon. To give you a clear example : A long time ago I had to prepare a number of instruments for customers = in the showroom of Yamaha in the Netherlands. After a few rounds, one C5 grand was their favorite, but they = explained to me that still something was missing.... it was just not = powerful enough. My piano instinct told me to do the one and last thing : I told them = to have another cup of coffee (yes Huber Liverman!) and I also told them = that I knew exactly what they meant. This was partly true, but also bluff on my side, but under the = circumstances, my professional life was on the block. I got out my Japanese tool to change the height of the back checks and = I started twisting and turning the back checks to the desired height. On the way I broke one of the back checks but was so extremely lucky = to be able to replace it immediately and without their seeing any of it = (they were busy slurping their adrenalin). After 10 minutes, I wiped the sweat from my brows and joined them for = my round of the brown stuff, and I told them that I thought I had = successfully solved their complaint. They went back and played the C5, and bought it immediately!! Thanks to the generous lesson of Tsuji-san. Andr=E9 Oorebeek On 16-aug-04, at 8:27, Richard Brekne wrote: Hi Avery In the case of the grand at the University, they were higher then = what turned out to be best for the sound. I am not sure whether they can = be too low in this regard. Andre is following the whole thread so I am = sure he can answer better. btw... I've heard the standard set both 2mm above and 2mm below the = hammer tail at let-off through the years. Quite a few times both ways = actually. It would be nice to hear what the consensus is here. Cheers RicB Avery Todd wrote: Ric, Just curious. Is Andre referring to the backchecks being higher = than normal (2 mm below the hammer tail at let-off), or lower? Avery This brings me to another one of Andre's suggestions... that = about the height of the backcheck having an impact on tone. Now this one = is just plain weird sounding... I'll be the first to admit it... but = there it was. When Andre was up here a couple years back he demonstrated = it to 5 of us, and no one could avoid admiting that he'd changed the = tone... the openess of the tone on the notes he'd adjusted. I asked the = famous Japanese pianotechs Mr. Ono and Mr. Takahara about this too = whilst I was in Japan this summer, and they both immediatly responded = along the lines... "but of course-- didnt you know that ???"... tho to = this day I have yet to find a satisfactory explaination for why the = height of the backcheck can influence the openess of the tone of the = piano. _______________________________________________ pianotech list info: https://www.moypiano.com/resources/#archives _______________________________________________ pianotech list info: https://www.moypiano.com/resources/#archives friendly greetings=20 from Andr=E9 Oorebeek Amsterdam - The Netherlands www.concertpianoservice.nl www.grandpiano.nl "where music is, no harm can be" ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/91/81/76/ca/attachment.htm ---------------------- multipart/alternative attachment--
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