---------------------- multipart/alternative attachment The more I read about this issue, the more I come to the conclusion=20 that : There is actually a discussion going on between the inhabitants of two=20= different continents, The USA and Europe. For some reason, there has been created a difference in the making of=20 hammers. I do not know why. This difference in making hammers and at the same time making use of=20 separate felt markets, has created different methods in making hammer=20 felt, hammer heads, and ultimately a different piano sound. Roughly speaking, we may now say that there are piano's with doped=20 hammers, and there are piano's with non doped hammers. Both continents make use of a kind of hammer dope, but the difference=20 in the use of said hammer dopes is caused by the different felt makers,=20= the different hammer makers and finally the difference in sound,=20 favored by the different kind of pianists, depending in which continent=20= they live. For years, I have spoken about an old/new felt that came back after=20 more than 40-50 years. It is of course the Wurzen felt, brought back to=20= us by Jack Brand, the owner/director of the Wurzen factory in Wurzen,=20 Germany. Together with Richard Brekne we explored the latest AA Wurzen quality=20 on an older Yamaha C3 grand. I dare say the fine result we achieved was=20= most certainly due to the improved quality of the hammer felt. At the same time, we now see that very same felt being sold in the US=20 and Canada, and we notice that that very same felt is treated in a=20 completely different way, namely with hammer dope. It shows clearly that we can have a discussion for sure, but methods=20 differ, and tastes too. How can we talk about a difference in taste? Andr=E9 Oorebeek On 14-mei-04, at 20:58, Richard Brekne wrote: > Grin... prodding is what I do best me thinks... so let me prod once=20= > more. > > You seem to make the clear statement that internal friction moments=20 > are critical to the sound resulting in the piano when a felt hammer=20 > hits the strings.... tho you dont go much into detail as to the=20 > hows/whats/whys... perhaps understandably so... but since this tangent=20= > of the discussion seems intent on comparision (for not to say=20 > competition) between <<lacquered up>> and <<needled down>> hammers it=20= > seems central to ascertain whether or not either approach results in=20= > anything particularilly negative in relationship to this internal=20 > friction capacitance > > The following quote from Bernhards last claims authority on a a=20 > related issue of this subject matter... > > "Measurements on hammers parameters has been done by Anatoli = Stulov, > where he measured felt stiffness and rebound time.He found > differences of a factor of about 100 % in the rebound time between > different new hammer sets made by diverse makers. (Abel, Renner, > Imadegawa) > The rebound time is in correlation with the felts /inner friction > losses/ (or imaginary part of elastic modulus) , not to = /stiffness/. > > Which states outright that rebound time is not correlated to hammer=20 > stiffness. > > So my prodding leads me to ask do you agree with the quote... and=20 > would you say that the addition of lacquer has any affect on this=20 > internal friction, and if so what... and the same question again with=20= > respect to needling. > > Cheers > > RicB > > > > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives > > friendly greetings from Andr=E9 Oorebeek Amsterdam - The Netherlands 0031-20-6237357 0645-492389 0031-75-6226878 www.concertpianoservice.nl www.grandpiano.nl "where music is, no harm can be" ---------------------- multipart/alternative attachment A non-text attachment was scrubbed... Name: not available Type: text/enriched Size: 3604 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/26/11/e2/e1/attachment.bin ---------------------- multipart/alternative attachment--
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