Jim, If it's a grand with a sostenuto rod, the damper upstop rail could be set so high that the damper underlevers are hitting the sostenuto rod. -John Parham > -------- Original Message -------- > Subject: [pianotech] wooden click at letoff?...reprise > From: Jim Ialeggio <jim at grandpianosolutions.com> > Date: Fri, January 04, 2013 9:19 pm > To: pianotech at ptg.org > > > An unsuccessful followup on this post from November... > > Got back back to this 10 year old Renner action with a recalcitrant > click at and after letoff. There are now 2 of them, F1 & G#1. > > I had thought originally that the sound was from the shank assembly, so > I appeared armed and ready for knuckle changing or shank changing. > Removed and re-glued both knuckles, then set about putting in a Dampp > Chaser. Finished the DC and listen for the click...still there...rats. > > Swapped a nearby quiet shank, and carefully regulated the swapped shank > so I got the full and proper letoff/aftertouch event. The swapped shank > produced the same click as the original shank. So my original assumption > that the shank was the culprit was too hastily decided. Started looking > around. > > -F1 had an anamolous geometry issue. JAck was smacking the jack stop > felt, while all the other notes including the other offending note, > G#1, were just fine at the jack stop felt. Removed half the jack stop > felt from F1...click remained. The jack toe is definitely set at a lower > angle than the other whips, and jack travel is more than the other > whips, but it doesn't seem to be the source of the sound, as I removed > enough felt to leave some clearance. > > -looked for flange issues on two whips (turbo). G# cracked on one side > of the flange, but F1 fine. > > -Then in messing around, I lifted the dampers with the pedal, and tried > both notes again. This time the click on both notes disappeared! I > suspected a loose lead in the damper levers. Took out the action played > with the offending damper levers, but as time was way past up, and had > to clear out, I couldn't remove the levers to check the weights on this > visit. In moving the levers there was no noise, but I don't think that > is a fair indication of anything, since connection to the back of the > key is their path to the click amplifying keyframe/keybed...though there > is a felt interface beween damper lever and key which I would think > would mitigate at least some noise. > > Question?...does this sound like the modus operandi of loose damper > lever weight? Why would damper lever weights click at and after letoff? > Let off does impart a kick to the key, which might rouse the offending > leads, but I'm still somewhat sceptical...but running out of ideas. I > scheduled a DC followup tuning in 3 weeks, so I have an imminent rematch. > > Jim Ialeggio > > > > > > -- > Jim Ialeggio > jim at grandpianosolutions.com > 978 425-9026 > Shirley Center, MA
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