Yamaha Jack issue

[jrpiano at win.eastlink.ca]

The plating problem was in some Yamaha Grands.
John M. Ross
Windsor, Nova Scotia, Canada
jrpiano at win.eastlink.ca
  ----- Original Message ----- 
  From: Greg Newell 
  To: 'Pianotech List' 
  Sent: Friday, March 21, 2008 1:08 AM
  Subject: RE: Yamaha Jack issue


  Avery,

                  Perhaps you're right. I thought I remember reading it about Yammy's too.

   

  Greg Newell

  Greg's Piano Forté

  www.gregspianoforte.com

  216-226-3791 (office)

  216-470-8634 (mobile)

   

  From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Avery Todd
  Sent: Thursday, March 20, 2008 11:51 PM
  To: Pianotech List
  Subject: Re: Yamaha Jack issue

   

  I've never heard of that on Yamaha's. I "think" it was Samick that had that problem. 

   

  Avery Todd

  Houston, TX 

  On Wed, Mar 19, 2008 at 10:34 PM, Greg Newell <gnewell at ameritech.net> wrote:

  Steve,

                  Are you sure this isn't a center pin plating issue? I recall reading somewhere that the plating comes loose and binds in the action center. The more you play it the worse it gets until you stop for a while.

   

  Greg Newell

  Greg's Piano Forté

  www.gregspianoforte.com

  216-226-3791 (office)

  216-470-8634 (mobile)

   

  From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Steve Blasyak
  Sent: Wednesday, March 19, 2008 12:29 PM
  To: pianotech at ptg.org
  Subject: Yamaha Jack issue

   

  Terry,
   
  I had the same problem with an M 500 a couple of weeks ago. I have had similar problems/ issues with consoles or uprights in the past usually in the high treble were the hammers are lighter. I always considered this a key weighting issue. This particular instance was at B 1. Checked all friction, whippen, jack and hammer. All good, in fact if anything they were pinned too loose. Tried more lost motion, lubricated jack, teflon on butt leather. Increased key dip. Increased jack spring tension. Nothing worked. Well in the end, with the damper pedal depressed and rapidly playing the note it would fail after about twenty repetitions. Under normal playing, if the jack failed to return under the hammer butt, as soon as you release the damper pedal the jack would slip back under the hammer butt. So I told the client "that's as good as it gets", and called it a day. Driving away, I tried to rationalize that it was an unexplained phenomenon. I could not escape the feeling of failure to solve the problem.
   
  One thing that was mentioned by someone I can't remember who. What would the key bed have to do with this phenomenon?  
   
  Steve Blasyak
  Orange County Ca.
   
  Pura Vida


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