Doug, Your right, that also should be in the test along with Newton's "thicknessing" the felt block under the keybed. Sincerely, David Ilvedson, RPT Pacifica, CA > Date: Sat, 18 Jul 1998 09:59:08 -0700 > From: Douglas Hershberger <dbhersh@home.com> > Organization: @Home Network > To: pianotech@ptg.org > Subject: Re: Sticking Steinway dampers > Reply-to: pianotech@ptg.org > David, > There is another test that might explain the problem you've > described. Depress the sostenuto, then randomly hit forte blows within > the damper area and if any dampers hold up it is because the knife is to > far away but not so far that the sostenuto won't work, although not at > its best. I always check this as well as the test you mentioned earlier. > Doug Hershberger,RPT > > David ilvedson wrote: > > > > Which also reminds me...the test for a properly regulated > > sostenudo is to depress the sustain and while holding it depress > > the sostenudo. The Sostenudo should lift all the dampers > > slightly and hold them up when the sustain is released. Then > > with slow release of sostenudo the dampers should fall randomly. > > Of course depressing the sostenudo should not engage any > > dampers. I have observed that sometimes the sostenudo won't lift > > the dampers after the sustain is depressed but will sustain > > individual dampers when used with the keys...I haven't thought > > this one through but does anyone know why the sostenudo will > > still work when it doesn't pass the classic test? > > > > David Ilvedson, RPT > > Pacifica, CA > > > > > Date: Fri, 17 Jul 1998 17:45:51 -0400 > > > From: nhunt@jagat.com (Newton Hunt) > > > To: pianotech@ptg.org > > > Subject: Re: Sticking Steinway dampers > > > Reply-to: pianotech@ptg.org > > > > > David Ivedson wrote: > > > If this happening regulate Sostenudo! Make sure the > > > dampers are not raising too far. They should just raise to > > > slightly above the height of the dampers raised by the sostenudo > > > pedal. If raising to high they can bind in the guide rail > > > bushings. > > > > > > This statement could confuse some people. The proper procedure (one > > > that works) is to regulate the timing of the dampers the the sustain > > > pedal so that there is a small amount of lost motion between when the > > > pedal is depressed and when the dampers begin to move. Next set the > > > sustain lever stop block so that the dampers are raised the same height > > > as the sharp keys. Next regulate the damper stop rail so the dampers > > > have but a tiny amount of lost motion after the pedal (not the key) is > > > depressed. > > > > > > Finally you can regulate the sostonuto. Set the blade so it is at about > > > 45 degrees to the vertical, set the height of the blade tip to the same > > > height as the tip of the tabs. With the action in and blocks in place > > > depress the sustain then the sostonuto, release the sustain and tap the > > > damper heads. If any fall through the blade needs to be moved toward > > > the dampers. Next depress the sostonuto several times to check if any > > > tabs are being touched. If so tap the blade bracket toward the font of > > > the keys. > > > > > > This should make all work well. > > > > > > Newton > > > nhunt@jagat.com > > > > > > > > > > > > > > David Ilvedson, RPT Pacifica, CA ilvey@jps.net
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