<!doctype html public "-//W3C//DTD W3 HTML//EN"> <html><head><style type="text/css"></style><title>Yamaha CP70</title></head><body> <div>><font face="Arial" color="#000000">What does plate compression have to do with pianos going out of tune?</font></div> <div><br></div> <div>I was referring to a large pitch change. The 'musician' in question told</div> <div>everyone I was a conscientious tuner because I retuned (gratis) the piano</div> <div>a week later after 'tuning' it not-so-well.</div> <div><br></div> <div>At the time I was under the impression that sound board deflection resulting</div> <div>from the increased tension was what caused instability on a pitch correction.</div> <div>SO without a sound board... no deflection...  hence no problem...</div> <div>The guy was such a jerk that I never bothered to explain pitch change instability.</div> <div>That was a live and learn situation.</div> <div><br></div> <div>That was the last time I ever placed a tuning hammer to one,</div> <div>next one will be a sledge hammer.</div> <div><br></div> <div>Now I explain the instability of pitch correction multiple times to a customer</div> <div>but it still seems to cause their eyes to glaze over. </div> <x-sigsep><pre>-- </pre></x-sigsep> <div><br> Regards,<br> <br> Jon Page</div> </body> </html>