Is this your basic capsize? Is the jack resetting? Andrew Anderson At 11:08 AM 9/25/2006, you wrote: >List - > >I am having a puzzling problem with a M & H BB grand action that I >have never encountered. Complete regulation (w/new shanks& >hammers), everything works great with the exception of 3 notes - F6, >A#6, G7 - in the high treble. I cannot get this to happen on the >bench, and even in the piano when the notes are played softly, even >in a trill, they perform perfectly. However, under continuous mf - >ff blows, as in tuning, after anywhere from 1 to 10 strikes (letting >the key all the way up), the hammer will get caught on it's way back >up by the back check, thereby not allowing it to strike. > >I have tried numerous adjustments to the angle of the back check as >well as to the height of check for these 3 notes, to no >avail. Everything seems to be identical to the surrounding notes, >including jack reg - both in the window and to the knuckle core -, >rep spring strength, key dip, stroke, the arc of the tails, let-off, >drop, etc., etc... you name it. Keys are rebushed and moving freely. > >If anyone can shed some light on this puzzler I would be most grateful!! > >Mark Potter
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