Yamaha Jack issue

[Avery Todd]

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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