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AES Journal Forum: Comment by Scott Dorsey on "The Aspects of Low-Inertia Tone-Arm Design"

Title: The Aspects of Low-Inertia Tone-Arm Design
JAES Volume 25 Issue 9 pp. 550-559; September 1977
Comment by: Scott Dorsey

This paper is so important in the scheme of  things that it appeared in the AES Compendium on Disc Recording.  The reason why this paper is important isn't Equation 3, which at the time was fairly well-known, but how the authors draw out all the consequences of that equation and what it actually means in terms of arm motion.  Kudos also to the authors for calling these "low inertia" arms instead of "low mass" arms.

If people in the audiophile community read and understood this paper, so much of the silliness and misinformation about the process of matching arms with cartridges would disappear.  So much mystery is made of the complex interations between the arm and the stylus when in fact it really isn't complex at all and comes down to a single scalar value (namely the system resonant frequency).


Posted on March 29, 2019 at 3:53:30 PM EDT



AES Journal Forum: Comment by Scott Dorsey on "A Successful Re-Slitter for Magnetic Tape"

Title: A Successful Re-Slitter for Magnetic Tape
JAES Volume 12 Issue 3 pp. 258,260; July 1964
Comment by: Scott Dorsey

This is just such an amazing idea.  Those of us who remember aftermarket tapes of the 1970s that had been slit down from instrumentation and video tapes might dismiss the whole idea of re-slitting out of hand.   Today we would consider 8 mils tolerance to be extremely wide.  But it is fascinating to see the lengths to which people will go when proper materials become unavailable.


Posted on March 29, 2019 at 3:53:16 PM EDT



AES Journal Forum: Comment by Scott Dorsey on "On Considerations in the Development of an Advanced Fe2O3 Cassette Tape Coating"

Title: On Considerations in the Development of an Advanced Fe2O3 Cassette Tape Coating
JAES Volume 22 Issue 3 p. 186; April 1974
Comment by: Scott Dorsey

This is a simple overview of a product development process for a cassette tape.  When this was published, it was an overview of the process and what constraints went into developing the product.  But today this is a very interesting paper because so much of the tape formulations were proprietary and people today are still not sure about what went into some of them.  This doesn't describe that, but it does describe why those things were selected and a few of the things selected.  Some of the discussion about the effects of particle size and configuration, which are specific to the low-speed cassette application, are really not addressed to this detail elsewhere.


Posted on March 13, 2019 at 5:32:32 PM EDT



AES Journal Forum: Comment by Arthur Quinn on "Analytical Modeling and Experimental Characterization of a Magnetic Pickup for Electric Guitar"

Title: Analytical Modeling and Experimental Characterization of a Magnetic Pickup for Electric Guitar
JAES Volume 65 Issue 9 pp. 711-721; September 2017
Comment by: Arthur Quinn

To answer my own question:

The magnetization curve in Fig.5 corresponds to a magnet radius of 2.5mm

Arthur


Posted on February 12, 2019 at 3:35:26 PM EST



AES Journal Forum: Comment by Arthur Quinn on "Analytical Modeling and Experimental Characterization of a Magnetic Pickup for Electric Guitar"

Title: Analytical Modeling and Experimental Characterization of a Magnetic Pickup for Electric Guitar
JAES Volume 65 Issue 9 pp. 711-721; September 2017
Comment by: Arthur Quinn

There seems to be a discrepancy between the magnet size quoted as radius 5mm and the coil inner radius which is given as 3.2mm.

Is it the magnet diameter that is 5mm?

Arthur


Posted on February 8, 2019 at 5:22:30 PM EST


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