Unstable regulation

[Jerry Cohen]

Greg,

This sounds like a classic case of growing action brackets. For some period
of time, Young Chang used an improper mixture of metals for the action
bracket castings. This causes them to keep expanding, causing you to
continuously turn the let-off dowels down. The only solution is to replace
the brackets.

In the past, Young Chang would cover the cost under warranty (if less than
10 years old). Perhaps others can chime in, and provide the current contact
names, numbers at Young Chang.

Jerry Cohen, RPT
NJ Chapter

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf
Of greg hollister
Sent: Friday, July 01, 2005 7:13 PM
To: pianotech@ptg.org
Subject: Unstable regulation

I have been tuning a mid-sized Young Chang grand for a
serious client for several years now. Each time I go
to tune it I find the hammers blocking at the strings.
I'll turn down the let-off dowels to some degree of
let-off to get me through the tuning. But each year I
go back to her house the condition is the same, the
hammers are blocking again.  I want to regulate this
piano as it should be but I am concerned that I will
be frustrated by whatever it is that causes the return
of this blocking condition. 
Does this sound familiar to anyone? Could this be a
loose let-off rail? I have marked the capstans to see
if they were turning on their own and they don't
appear to be.







__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 
_______________________________________________
pianotech list info: https://www.moypiano.com/resources/#archives