Complementary JFET pairs in the UK?

Mr Evil · 31st December 2004, 06:15 PM

I like using FETs of all kinds and I also like building symmetrical things. Thus a problem that plagues me is that finding complementary pairs of JFETs is difficult. First it's hard to find what component is a complement to another, since very few specify a complement in the datasheet. Secondly, even if I do find a suitable pair, it's very unusual to be able to actually purchase them at the usual places of RS and Farnell.

Does anyone here know of a reliable supplier who stocks JFETs?

Mike Gergen · 1st January 2005, 07:10 AM

For your neighborhood your best bet may be Borbely's web site.

Mr Evil · 2nd January 2005, 02:16 PM

Thanks. I see they match FETs too, which is nice. However they don't have online ordering, which is inconvenient.

BTW, here's a link to Borbely Audio, in case any Google-challenged individuals read this thread

SY · 2nd January 2005, 02:37 PM

Matching FETs is quite easy. Just set up a jig to simulate the desired operating point and use a voltmeter. This will be better than relying on someone else's matching procedure which may or may not be suitable for your application.

And generally, FETs are cheap enough to overbuy. If I need two matched sets, I'll buy 20 or 30 FETs, and end up with a few matched sets plus some overage to use in less critical spots (like followers).

VS · 12th January 2005, 01:32 AM

Hi ! Since you are in the UK, I supose

, why don't you try
www.grandata.co.uk ?

mr.duck · 6th January 2007, 08:39 PM

I'm also looking for complementary JFETs in TO-92 package for input to amplifier. I've seen an amp that uses J105 and J106. Not sure if these devices are best for good results. Any comments? Are there any specs I should pay close attention to when choosing devices? Amplifier I am building does not use global negative feedback at all. So device selection is probably more sensitive. Any advice?

mr.duck · 6th January 2007, 10:32 PM

I think I made a mistake. J105 and J106 are not complementary N and P channel devices. BTW isn't it possible to edit previous posts?

31st December 2004, 06:15 PM	#1
Mr Evil diyAudio Member Join Date: Aug 2004 Location: Behind you	Complementary JFET pairs in the UK? I like using FETs of all kinds and I also like building symmetrical things. Thus a problem that plagues me is that finding complementary pairs of JFETs is difficult. First it's hard to find what component is a complement to another, since very few specify a complement in the datasheet. Secondly, even if I do find a suitable pair, it's very unusual to be able to actually purchase them at the usual places of RS and Farnell. Does anyone here know of a reliable supplier who stocks JFETs? __________________ https://mrevil.asvachin.eu/

2nd January 2005, 02:16 PM	#3
Mr Evil diyAudio Member Join Date: Aug 2004 Location: Behind you	Thanks. I see they match FETs too, which is nice. However they don't have online ordering, which is inconvenient. BTW, here's a link to Borbely Audio, in case any Google-challenged individuals read this thread __________________ https://mrevil.asvachin.eu/

2nd January 2005, 02:37 PM	#4
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Matching FETs is quite easy. Just set up a jig to simulate the desired operating point and use a voltmeter. This will be better than relying on someone else's matching procedure which may or may not be suitable for your application. And generally, FETs are cheap enough to overbuy. If I need two matched sets, I'll buy 20 or 30 FETs, and end up with a few matched sets plus some overage to use in less critical spots (like followers). __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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1st January 2005, 07:10 AM	#2
Mike Gergen diyAudio Member Join Date: Sep 2004 Location: Elk River MN	For your neighborhood your best bet may be Borbely's web site.

12th January 2005, 01:32 AM	#5
VS diyAudio Member Join Date: Dec 2004 Location: Lisboa	Hi ! Since you are in the UK, I supose , why don't you try www.grandata.co.uk ?

6th January 2007, 08:39 PM	#6
mr.duck diyAudio Member Join Date: Jun 2006	I'm also looking for complementary JFETs in TO-92 package for input to amplifier. I've seen an amp that uses J105 and J106. Not sure if these devices are best for good results. Any comments? Are there any specs I should pay close attention to when choosing devices? Amplifier I am building does not use global negative feedback at all. So device selection is probably more sensitive. Any advice?

6th January 2007, 10:32 PM	#7
mr.duck diyAudio Member Join Date: Jun 2006	I think I made a mistake. J105 and J106 are not complementary N and P channel devices. BTW isn't it possible to edit previous posts?

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