Bill, Is there a coil spring on the damper lifter tray? My first guess, Jon Page At 10:45 PM 7/11/99 -0400, you wrote: >I'd been listening to a grunting sound, like a fallboard-to-front-stretcher >or loose metal lyre brace, during the tuning of a Falcone 74, sympathetic >to F4. In trying to chase it down, the best I could come up with was that >it was coming from inside the action cavity (loud and clear). So I fastened >anything inside I thought could be making noise: damper upstop rail, damper >assy mounts, action brackets to key frame, the rails on the key frame. At >first it seemed to go away when I pried downward on the action brackets >from the pinblock. The key frame bedding was quite solid. I could not >follow the sound over the strings, or under the keybed. > >But for all this screw-tightening, I never had direct access to the sound, >because it required the action being in place to play F4 (348 Hz). > >What I needed was a signal generator, tunable to any pitch in the hearing >range which could drive a speaker magnet to inject 348 Hz onto various >spots inside the action cavity. It would sure excite the sympathetic >vibration. > >Has anybody ever done this? Would a Dremel tool on a rheostat do this? (My >first thought was a vibrator, but I would have no idea whether they are >tunable or not). > >Bill Ballard, RPT >New Hampshire Chapter, PTG > >"If we see you SMOKING we will assume that you are on fire and will take >appropriate measures".......Sign in a Music Dept. Hallway > Jon Page, Harwich Port, Cape Cod, Mass. mailto:jpage@capecod.net ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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