[pianotech] yamaha C6

[Leslie Bartlett]

Hmmm hadn't thought of pin block. I'll give it a look.     I expect the
piano was 10+ years old when I started tuning it.

Les

 

 

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From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Joe DeFazio
Sent: Thursday, September 08, 2011 9:27 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] yamaha C6

 

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

Date: September 8, 2011 6:34:47 PM EDT

 

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

 

Hi Les,

 

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

 

Have you checked the plate flange/block fit with a mirror, a flashlight, and
a feeler gauge?  If you don't have a set of feeler gauges at hand, you can
us paper, of course.  What you would be looking for is a fairly consistent
gap between the plate and the flange in either the bass or the treble (which
would allow the pinblock to rock as you added tension to one side or the
other;  a touching section the tenor flange/block interface would 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 with changes
in humidity.  I have half-assumed that this was because those tenor 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 C6 with a very fast pitch adjustment before tuning.  If you are able to
float the pitch a bit (measure the pitch of about the third-highest bichord,
and then tune the rest of the piano to that pitch), you may be able to
safely get away with 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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