This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment I've got a similar Petrof, but smaller...5' 7" or so...same problem. = It does seem, to me you're going to have a really low upweight...? Wh= y not, as Dean wrote, remove weight from the hammer? David Ilvedson, RPT Pacifica, California Original message From: Erwinspiano@aol.com To: pianotech@ptg.org Received: 12/8/2005 10:40:48 AM Subject: Petrof Quality Listers After a recent encounter with a 10 year old 6 ft. Petrof ,my once fa= irly high opinion of them has sunk. I generally have liked the sound of= there bellies & the workamnship looked good but I had the following e= xperience. The action although upon examination had a nicely done 5.3 overall ac= tion ration the touch was extremely heavy high 60's down & below 20 up.= The problem is that the hammers were just way to heavy for example Not= e 16 was 10.5 grams. That's hammer wt. not strike weight. So extrapolate those heavier than normal readings thru the rest of th= e scale. Since the desired service was to make it play more like a Saturn than= a truck & no parts were being changed the original parts were used. T= he remdey was to add one lead to a sparsely leaded keyboard & then ad= just the wippen springs. Even at that the average down up weight was ar= ound 56 to 22 up which is a 39 balance weight. I believe the real solution was a lighter set of hammers & subsequent= even leading applied with springs detached to some higher than normal = nominal number down/up numbers & then re -tweaking the springs. for a l= ight bit of wippen weight removal from the system. This to me was a prime example of a nicely done leverage set up that = was doomed from the git go due to extreme hammer weights It seems all = grand piano actions fall within certain reasonable & typical leverages = that when exceeded are problematic until rectified by appropriate count= er measures. ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/a8/8b/bc/56/attachment.htm ---------------------- multipart/alternative attachment--
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