Yamaha bobbling

vince mrykalo madvinmryk@yahoo.com
Wed, 14 Apr 2004 17:04:28 -0700 (PDT)


---------------------- multipart/alternative attachment
I know this may be more work than you want to do for this, but a thicker butt felt is also a solution.


David Graham <dcgrpt@earthlink.net> wrote: Hi all: I tune a LOT of new Yamaha uprights, and they all do this to some
extent. You have to check two things: the lost motion-as soon as there is
more than enough,the problem will occur; and you have to weaken the damper
return springs. They are too tight, and "push back" on the key at the bottom
of the stroke, jamming the jack as it tries to escape. I don't see too many
U#s, but it certainly happens a lot on P22s,U1s and the T series pianos. I
weaken the spring by pushing it against the damper lever with the Hart
spring tool. Well, now that I think of it, there is one other potential
cause- many times the shoe at the bottom of the balance hole is too thick,
and the key will bind as it rocks, even though it seems free when you lift
it. Pianotek makes a chisel tool that goes inside the key and removes some
of the wood.
-- 
---
David Graham 


_______________________________________________
caut list info: https://www.moypiano.com/resources/#archives


Vince Mrykalo
University of Utah
		
---------------------------------
Do you Yahoo!?
Yahoo! Tax Center - File online by April 15th
---------------------- multipart/alternative attachment
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/caut.php/attachments/b8/67/7d/9b/attachment.htm

---------------------- multipart/alternative attachment--

This PTG archive page provided courtesy of Moy Piano Service, LLC