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I think the app note is 2020, but this article published in 2009 mentions buying some in Sept 2006</div>
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<a href="https://audioxpress.com/assets/upload/files/colin2993.pdf">https://audioxpress.com/assets/upload/files/colin2993.pdf</a></div>
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<b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of brianw <brianw@audiobanshee.com><br>
<b>Sent:</b> 20 June 2025 22:20<br>
<b>To:</b> synth-diy@synth-diy.org DIY <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] Dual Matched N JFET from Linear</div>
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<div style="font-size: 11pt;">Wow!<br>
<br>
The Application Note for the LSK389 was written by Bob Cordell. I have his excellent book on Designing Audio Power Amplifiers. It's always nice when technology companies employ talented technical writers to explain their products. It's usually like getting
a free course in electronics design.<br>
<br>
I could not find a date on the App Note, but it cites references as recent as 2019 (that most recent one being his own book, ha!).<br>
<br>
Brian Willoughby<br>
<br>
<a href="https://www.linearsystems.com/_files/ugd/7e8069_5339d0e5c21c409abccc4701d82d1976.pdf" id="OWA37534c6d-eb50-c3ce-eb5e-78e2a6e7f092" class="OWAAutoLink" data-auth="NotApplicable">https://www.linearsystems.com/_files/ugd/7e8069_5339d0e5c21c409abccc4701d82d1976.pdf</a><br>
<br>
<br>
On Jun 20, 2025, at 1:52 PM, Mike Bryant <mbryant@futurehorizons.com> wrote:<br>
> LSK389 is hardly new. Been around for a long time, although availability varies.<br>
> But the price never seems to vary. <br>
><br>
> From: Tim Parkhurst<br>
> Sent: 20 June 2025 21:34<br>
> <br>
> Hey, Analog Hounds,<br>
><br>
> Linear Systems is promoting a new Matched Dual JFET, and you might even be able to get a sample or two. Useful? Not?<br>
><br>
> <a href="https://www.linearsystems.com/post/why-engineers-choose-the-lsk389-for-high-precision-analog-design?utm_campaign=d2b0395f-db24-487d-8e02-adcff714e7a8&utm_source=so&utm_medium=mail&cid=a05ef50a-a9c5-473d-950b-37f3f1a2d83d" id="OWA235a5045-e6a6-eed2-c29b-a4787633f695" class="OWAAutoLink" data-auth="NotApplicable">
https://www.linearsystems.com/post/why-engineers-choose-the-lsk389-for-high-precision-analog-design?utm_campaign=d2b0395f-db24-487d-8e02-adcff714e7a8&utm_source=so&utm_medium=mail&cid=a05ef50a-a9c5-473d-950b-37f3f1a2d83d</a><br>
><br>
> Tim (define "useful") Servo<br>
<br>
<br>
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