Mutiple bouncing

[Clyde Hollinger]

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For a company with as good a reputation as Yamaha, don't you think it's 
about time they redesign their actions to get rid of this problem?

Regards,
Clyde

Dave Nereson wrote:

>----- Original Message ----- 
>From: "Jere Fryett" <jfryett@minot.ndak.net>
>To: <pianotech@ptg.org>
>Sent: Wednesday, May 26, 2004 7:56 PM
>Subject: Mutiple bouncing
>
>
>  
>
>>Dear List,
>>
>>Several of the new Yamaha P22's and M600's that have been coming into the
>>store here in Minot have terrible multiple bounce problems on very soft
>>playing.  I have tried several things and nothing seems to work for
>>me.  The specs seem to be on or at least fairly close.  For key height I
>>get 58mm from the key bed but only 19mm from the top of the key slip to
>>    
>>
>the
>  
>
>>top of the key.  The hammer strikes the wire before the jack is halfway
>>out.  Loud playing or even moderately loud playing gives no problem, it is
>>just that very soft, light touch that gives the problem.
>>
>>What should I do short of a full regulation?  Is there a quick fix?  I
>>    
>>
>have
>  
>
>>some luck increasing the key dip but not a lot.  There are people looking
>>at these pianos but they bounce so badly they are getting turned off.
>>
>>Thanks for your help.
>>
>>Jere
>>    
>>
>
>    I worked for a Yamaha dealer for 7 years and Yamahas, especially
>consoles, have had the double-striking problem for a long time.  It's partly
>due to the Schwander-type butt spring rather than the old type (not as
>strong), sometimes the hammer-butt pinning (but I forget if too tight or too
>loose makes it double-strike -- probably too loose), and, apparently, the
>damper spoon regulation (I hadn't heard that one before).  Yamaha admits to
>this and usually advises to make sure there's no lost motion and that key
>height is not low and dip is not too shallow.  They also used to tell you to
>tell the owners/players to make sure they're striking the keys with blows
>that don't hesitate in the middle of the stroke, in other words, make sure
>they're not "trying to get it to double-strike"  (I'm sure most of them are
>not).  You can try bending the butt spring a little stronger (take it out of
>its loop, bend up, put back).  If the blow is a bit wide, you can shorten it
>a bit and take out the resulting lost motion.
>    Sometimes everything's a little tight when new, on purpose, since they
>know it will wear in and loosen up with playing.  But if its hurting sales,
>you should call Yamaha and tell them that and ask what to do.  Ask about the
>butt flange pinning and whether too tight or too loose helps cause
>"bobbling."
>    I've encountered many Kawai consoles with the same type butt spring that
>have the same problem.  I know that's not the only culprit, but . . . (?)
>    Make sure the jacks are coming away from the butt leather and not being
>hindered by the regulating rail (let-off rail).
>    --David Nereson, RPT and Little Red Schoolhouse alum
>
>
>_______________________________________________
>pianotech list info: https://www.moypiano.com/resources/#archives
>
>  
>

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