This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Dear colleagues -=20 The piano is a 1972 S&S Hamburg B. It was restrung about 5 years ago, = and had the pinblock replaced (Falconwood, unfortunately), and also had = new hammers (S&S - Hamburg), shanks & flanges installed. The company = that did the work is an experienced rebuilding outfit. The piano came back "dead". Very limited sustain - less than 5 seconds = in octaves 6 and 7 (many notes). Extremely dead rear duplex - less than = 2 seconds in top two sections. Weak upper partial volume and sustain = throughout. Bass is tubby. False beats throughout; weird out-of-tune = partials in the bass. All these tonal phenomena occur whether the string = is struck by a hammer, or is plucked. After racking my brains about this piano (I service it about 2x per = year), I finally had the idea to measure the height of the bridge cap = above the soundboard, on both the speaking length side, and on the rear = duplex side. The rear duplex side is anywhere from 2/32" to 6/32" inch = _higher_ than the speaking length side.=20 The piano is extremely unstable. It is impossible to get absolutely = beatless unisons for more than 2 - 5 mf to ff hammer strokes. The = beating that does creep in is very slight, but noticeable to my nearly = 28 years of tuning experience ears (credited tuner by name on many = Grammy Award-winning recordings, as well as concert piano factory = trained by Yamaha, Steinway & Baldwin; occasional tuner at Carnegie Hall = and Lincoln Center).=20 Although I really dislike Falconwood blocks, this one is measuring an = average of 140 inch/lbs. Not too tight. 2/0 pins with about 3/8" = clearance between the bottom of the coil and the plate. I have squeezed = the wire gently around the hitch pins so that the strings are parallel = to each other. I have also used CLP at the capo, agraffe, understring = felt, and the apex of the rear duplex, and at the raised projection that = terminates the upper duplex in the top two sections.=20 No or maybe a little improvement in stability.=20 All plate perimeter screws are tight, as are webbing screws. Does this sound like a rolled bridge? How is a rolled bridge caused? Is = there an accurate way to diagnose a rolled bridge? Can it be fixed in = the field?=20 Thank you very much in advance for your comments and advice! See you in Reno!?!?!?!?!?!!!!! Sincerely, Tom Sheehan, RPT NYC Chapter ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/a2/6f/62/15/attachment.htm ---------------------- multipart/alternative attachment--
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