Lance, I don't about the K&B you're working on, but one thing that seems to contribute to this problem on Yamaha's (particularly the P22) is the relationship between let-off and damper lift. These pianos sometimes are set up so that the let-off button and the damper spoon are contacted simultaneously. This produces enough friction to create a "false bottom" to the key stroke, particularly on a soft blow. The "false bottom" causes enough hesitation in the key to allow a bobble before the jack can get through let-off. John Mckone, RPT >Dear List, >I GIVE UP! I've been trying to help a customer of mine who bought a cheap >Kranich & Bach (made in Europe, 1993, sold by Baldwin) 42" upright. This >piano had double striking or bobbling hammers when I first saw it. To be >brief and to the point; I added let-off distance and dip, still some >bobbling on soft blows, added more, still bobbling at times, then I added >key height/dip, adjusted checking, and unless you are VERY deliberate and >get to the very end of each key stroke, IT STILL DOES IT occasionally. >Maker won't help, they said (basically) that's what you get for buying a >cheap piano. Now, the piano is no fun to play and you still get the >occasional bobble if you're not careful. > >I have come across this problem hundreds of times over the years and have >always been able to regulate it out, but I can't seem to get this one to >stop without regulating it out of the comfort zone. I remember some >Samicks and Yamahas in the low tenor had this problem due to the angle of >the surface on the butt where the jack contacts. Any ideas? Thanks very >much! >Lance Lafargue, RPT >New Orleans Chapter >Covington, LA. >lafargue@iamerica.net John McKone, RPT St. louis Park, Minnesota (612) 280-8375 mckonejw@skypoint.com
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