Low noise dual JFET pair

rtarbell · 15th March 2006, 10:44 PM

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?

anatech · 15th March 2006, 11:59 PM

Hi rtarbell,
Look for 2SK389. Google should cough up some sources, also search the trading post.

-Chris

Panelhead · 16th March 2006, 01:27 AM

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!

George

AndrewT · 17th March 2006, 06:50 AM

Hi,
there is a current production version, US I think, but only available in Nchannel.

Onra · 17th March 2006, 10:11 PM

Hi,
have a look at
http://www.interfet.com/jfet.htm
http://www.crystalonics.com/home.htm (don´t get shocked by their price list)
http://www.vishay.com/fets-small-signal/
or
http://www.linearsystems.com/products.html#GlossD
Onra

15th March 2006, 10:44 PM	#1
rtarbell diyAudio Member Join Date: Sep 2005	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?

16th March 2006, 01:27 AM	#3
Panelhead diyAudio Member Join Date: Dec 2002 Location: Houston	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! George

17th March 2006, 06:50 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, there is a current production version, US I think, but only available in Nchannel. __________________ regards Andrew T.

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15th March 2006, 11:59 PM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi rtarbell, Look for 2SK389. Google should cough up some sources, also search the trading post. -Chris

17th March 2006, 10:11 PM	#5
Onra diyAudio Member Join Date: Jul 2005 Location: near Frankfurt/M	Hi, have a look at http://www.interfet.com/jfet.htm http://www.crystalonics.com/home.htm (don´t get shocked by their price list) http://www.vishay.com/fets-small-signal/ or http://www.linearsystems.com/products.html#GlossD Onra

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