Graeme Cohen Philips OM1556 Mic Preamp Documents

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mediatechnology
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Graeme Cohen Philips OM1556 Mic Preamp Documents

Post by mediatechnology » Fri Aug 01, 2008 12:42 pm

OK, it has taken quite a while, but my AES colleague Ian DuRieu has talked Graeme Cohen into presenting his perspective of the preamp that is the subject of this thread. It can be found here http://leonaudio.biz/cohen.htm Thanks Ian and Graeme, enjoy!
Keith Taylor
I wanted to share the photos with you available on the link above courtesy of Graeme, Ian and Keith. For more information visit Ian's site http://www.leonaudio.biz and obtain the pdf where you'll find Cohen's papers and original OM1556 documents. Thanks guys.

Here are the pics. Too bad we can't make hybrids at home.

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The LM194 input transistors on the OM1556. Image courtesy of Graeme Cohen and Ian DuRieu.

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An overview of the OM1556. Image courtesy of Graeme Cohen and Ian DuRieu.

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A closeup of the OM1556. Image courtesy of Graeme Cohen and Ian DuRieu.

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OM1556 Preconformal coating. Image courtesy of Graeme Cohen and Ian DuRieu.

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OM1556 Conformal coating. Image courtesy of Graeme Cohen and Ian DuRieu.

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An OM1556 Preamp. Image courtesy of Graeme Cohen and Ian DuRieu.

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A "serious" Graeme Cohen in his workshop July 2008. Image courtesy of Graeme Cohen and Ian DuRieu.
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