ETD question re: unisons

[Don]

HI Robert,

That window exists because current edt's tune only one partial, generally
speaking the partials on any 2 wires do not line up perfectly. My own
belief is that our ears hear the *noisiest* coincident partial when doing
unisons, and then we juggle it by ear until we have a cancellation effect.
One could experiment by tuning various partials--but an edt is supposed to
save time not take more time. I also believe that the pitch *change* (not
necessarily a drop from my puny research) is partly due to the
imperfections in the wire, becuase while f6 may *drop* in pitch f#6 may be
*sharp* of pitch after unisons are tuned.

At 08:26 PM 2/14/01 -0700, you wrote:
>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
>> >
>>
>>
>
>
>

Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T.

Tuner for the Saskatchewan Centre of the Arts

mailto:drose@dlcwest.com
http://donrose.xoasis.com/

3004 Grant Rd.
REGINA, SK
S4S 5G7
306-352-3620 or 1-888-29t-uner