IASA and ARSC list members,
(My apologies for cross-posting, as I know there is a substantial overlap.)
I'm pleased to report that for anyone that missed the 133rd AES
Convention in San Francisco, a good chunk of the talk "Popular
Misconceptions about Magnetic Recording History and Theory—Things You
May Have Missed over the Past 85 Years"
(http://www.aes.org/events/133/historical/?ID=3197) is freely
available in PDF form. Please see the forwarded email below from one
of the presenters for the links.
• Who really discovered AC Bias? The four groups that re-discovered it
around 1940, including one person you've probably never heard of.
• How does AC bias actually work?
• Is a recording properly described by "surface induction"?
• The story of the "effective" gap length of a reproducing head, and a
correction to Westmijze’s Gap Loss Theory.
• Does Wallace’s “Thickness Loss” properly describe the wavelength response?
• Does disconnecting the erasing head make a quieter recording?
Hoover Institution Archives
----- Forwarded Message -----
From: "Jay McKnight"
To: "Ampexians" <[log in to unmask]>, "Studer-List"
<[log in to unmask]>, "AESHC" <[log in to unmask]>
Sent: Friday, November 2, 2012 7:53:43 PM
Subject: [AESHC] Papers from the AES SF Convention
Hello AES Historical Committee, Ampexians & Studer List,
At the AES Convention in SF last week, my son Jeff and I gave a
magnetic recording paper. I have written it up and posted it at
You will see that I removed the text and figures in sec 6, and
replaced them with a link to a longer, and I hope clearer version at
Note also that Jeff is still working on a written version of his part
of the talk on how AC bias really works -- that is all-new material,
which we hope will be done early in 2113. I'll email you when it's