Stéphane, before you go through the trouble of re-hanging the hammers while taking off too much felt off the top, I would try some thin CA right above the top of the molding. You will be amazed at what it will do the perk up the last 6 notes. Al Guecia -------------------------------------------------- From: "Stéphane Collin" <collin.s at skynet.be> Sent: Friday, June 13, 2008 5:41 PM To: "'Pianotech List'" <pianotech at ptg.org> Subject: RE: Getting the high trebble right > Hi John. > > At the moment, there is 5 mm felt between the molding and the crown at > hammer 88. On the older hammers, though, there was nearly nothing left. > Yet they sounded very well, musical and all. That might very well be a > start point for experiment. But if I reduce the felt layer by 3 mm , I > will > have to re hang my hammers, not ? If so, well that is life, as someone > recently told me. I spent some time in checking the right angle condition > between hammer and strings at contact time, as you convinced me that this > condition is absolutely crucial, certainly in the treble. (I'm convinced, > certainly). > What is your favourite dope ? I indeed am always deceived by the > acetone-key top mixture, as it brings some high partials at the cost of > colour shades dynamics (who disappear), and no more question of fine > voicing > after. But I always put the mixture from top. I will certainly try at > the > moulding next time. > I like your idea of letting the different hammers bounce on a hard > surface. > Makes so much sense, as always. > > Thanks for your valuable input. > > Stéphane Collin. > > -----Original Message----- > From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On > Behalf > Of John Delacour > Sent: vendredi 13 juin 2008 23:06 > To: Pianotech List > Subject: Re: Getting the high trebble right > > At 20:58 +0200 13/6/08, Stéphane Collin wrote: > >>Old hammers were lighter than the new ones, but new ones (Renner Wurzen >>AA) > > What thickness of felt have you between the strike point and the > moulding wood? Quite often Abel gives you too much, which means you > get far too long a contact with the string. You can either inject a > hard-setting dope at the point of the moulding or reshape the top of > the hammer. Applying dope from the top downwards will not achieve > the effect you want. Let the old hammer and the new bounce on a hard > heavy surface and see how differently they behave. > > JD > > > > > > >
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