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Low noise dual JFET pair
Low noise dual JFET pair
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Old 15th March 2006, 10:44 PM   #1
rtarbell is offline rtarbell  United States
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Join Date: Sep 2005
Default Low noise dual JFET pair

I've seen these parts in similar threads before, but I'm having a hard time locating them:

I'm looking for a dual matched low noise JFET IC for the input of an audio amp. The part that keeps coming up is the LSK389, but I can't seem to find it in small quantities (I would really only need about three of them).

Does anyone know where I can find a low noise dual jfet pair (not just the LSK389) in the USA?
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Old 15th March 2006, 11:59 PM   #2
anatech is offline anatech  Canada
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Location: Georgetown, On
Low noise dual JFET pair
Hi rtarbell,
Look for 2SK389. Google should cough up some sources, also search the trading post.

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Old 16th March 2006, 01:27 AM   #3
Panelhead is offline Panelhead
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Join Date: Dec 2002
Location: Houston
Default jFETS

You need to fit the transistor to the application. The 2SK389 is quiet, really two 2SK170's in the same case for temp drift control.
For higher current uses the 2N5566 is great, it can handle at least three times what the 389 can do. There is a source for these on ebay right now. The price at Mouser and Newark has almost tripled lately.
Both a N channel, the match for the 2SK389 is the 2SJ109. Now that is getting to be a rare one.
It would be hard to beat any of these three in the proper application.
Good luck!

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Old 17th March 2006, 06:50 AM   #4
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
there is a current production version, US I think, but only available in Nchannel.
regards Andrew T.
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Old 17th March 2006, 10:11 PM   #5
Onra is offline Onra  Germany
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Join Date: Jul 2005
Location: near Frankfurt/M
have a look at
http://www.crystalonics.com/home.htm (donīt get shocked by their price list)
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