[pianotech] yamaha C6

[Alan Eder]

When did Yamaha start fitting their pinblocks snugly up against the plate flange?


Alan Eder


-----Original Message-----
From: Leslie Bartlett <l-bartlett at sbcglobal.net>
To: pianotech <pianotech at ptg.org>
Sent: Thu, Sep 8, 2011 4:35 pm
Subject: Re: [pianotech] yamaha C6



Hmmm hadn’t thought of pin block. I’llgive it a look.     I expect the piano was 10+ years old when I started tuningit.
Les
 
 



From:pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Joe DeFazio
Sent: Thursday, September 08, 20119:27 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] yamaha C6

 


From: "LeslieBartlett" <l-bartlett at sbcglobal.net>

Date: September8, 2011 6:34:47 PM EDT

 

I’ve been tuning a C6 for 7 years or more, and it has everytime been h*** to tune, and a 3-hour job. Nothing will stay stable. I’ve beendoing it every two months now for awhile and today was the second time I didn’thave to go through each string on second pass.  Is it possible that theagraffes have been ground so sharply that one can’t get a stable terminationpoint?.....

 

Hi Les,

 

I would be very surprised if the agraffes are the problem.

 

Have you checked the plate flange/block fit with a mirror, aflashlight, and a feeler gauge?  If you don't have a set of feeler gaugesat hand, you can us paper, of course.  What you would be looking for is afairly consistent gap between the plate and the flange in either the bass orthe treble (which would allow the pinblock to rock as you added tension to oneside or the other;  a touching section the tenor flange/block interfacewould act as a pivot).

 

I will be somewhat surprised also if that turns out to be the problem,as most C6 pianos I service seem to be fairly carefully constructed. However,it is certainly something to check.

 

The tenor on some C6 pianos does seem to move more than average withchanges in humidity.  I have half-assumed that this was because thosetenor strings were at a lower percentage of their breaking point than average(for tenor strings), but I have not scaled or rescaled one, so this is just speculation. In any case, I do quickly knock down (or lift up) the tenor of the C6with a very fast pitch adjustment before tuning.  If you are able to floatthe pitch a bit (measure the pitch of about the third-highest bichord, and thentune the rest of the piano to that pitch), you may be able to safely get awaywith just moving the tenor and then doing one pass at the floated pitch. That might save you some time.

 

Joe DeFazio

Pittsburgh



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