Hi Roger I'm really on a roll tonight , this is my 3rd reply.Correct me if I'm wrong ,but are you saying that you tune each string a number of times with the RCT,then take a reading of the three together and have a pitch drop of .3 cents.I have been using a Sat for a number of year sand I find that I cannot always use the lights to tune a unison.I do not have a RCT to do a real comparison but I find that when the lights stop there still is a "window '' to tune within.With my SAT a difference of .3 cents would be noticable to the ear.I would wonder if all that has happened is that one of the strings is not in unison. Regards Murray ----- Original Message ----- From: "jolly roger" <baldyam@sk.sympatico.ca> To: <pianotech@ptg.org> Sent: Wednesday, February 14, 2001 9:27 AM Subject: Re: ETD question re: unisons > Hi Howard, > Yes it is easy to confirm. The test that I have done with > a RCT show about a 0.3 cent drop in octave 5/6. The test was performed by > tuning each string individually several times, to over come the > interaction. then the net 3 string unison was measured. > The effect is known as string coupling. > My own theory is that. as all strings start to increase the amount of > energy into the bridge, the board is moving through a greater excussion, > and hence dropping the frequency a tad. > Now I've been out to lunch before, and I could be off base on this one. > Regards Roger > > > At 10:47 AM 2/14/01 -0500, you wrote: > >Hi everyone, > > > >Since I know nothing about ETD's my question might be naive. Nevertheless > >here goes: I believe that Virgil's assertion that a 3 string unison is > >flatter than each of the single strings heard singly, is a bit questionable > >or should I say not fully accepted. Wouldn't it be easy and conclusive to > >check this thesis by using an ETD to measure this? Thanks! > > > > > >Howard S. Rosen, RPT > >7262 Angel Falls Ct. > >Boynton Beach, Fl 33437 > > > >hsrosen@gate.net > > > >
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