On some pianos the coupling effect put the unisson sharp after 1 second ringing. the EDT will read an unison sharper than the one string alone sounding, because you have to wait to have a clear pattern. That can depend of the way the unisons are done too. Isaac OLEG > -----Message d'origine----- > De : owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]De la part > de Don > Envoye : samedi 23 mars 2002 07:30 > A : pianotech@ptg.org > Objet : Re: Muting high treble > > > Hi Jay, > > I have tried to measure the effect you are speaking of. It would be rare > for it to be as large 2 cents and it is inconsistant from piano to piano > even with the same make and model. I suspect if you are having > this sort of > pitch drop after doing a unison that plate flex (pitch correction) is > making the difference. > > At 03:03 AM 3/23/02, you wrote: > >I thought this phenomenon is just the opposite. The pitch > sounds 2-4 cents > >sharper when the strip mute is in, compared to when it's out and > after the > >unisons are tuned. Isn't this common and tuners must compensate? > The pitch > >difference is obvious when comparing a muted trichord - hearing just one > >string compared to the overall pitch after tuning its two unisons. > > > >Jay Mercier > > > Regards, > Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. > > mailto:pianotuna@accesscomm.ca > http://us.geocities.com/drpt1948/ > > 3004 Grant Rd. > REGINA, SK > S4S 5G7 > 306-352-3620 or 1-888-29t-uner >
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