I recently picked up a few 2SK163L, which is the N channel compliment. Hoping to find a few 2SJ44 and try a some complimentary arrangements.
*edit - post title should read 2SJ44 L
*edit - post title should read 2SJ44 L
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I have 30 pieces of the ’N’ type, and they all measure in the 8-9 mA Idss range. Ultimately looking for something in that range, which I realize is a long shot.
One way to get something like a 2SJ44 is this. Also, depending on how picky you are, some companies (I know Hafler, for example, was one that did) paired the 2SK163 with 2SJ74 as a pseudo-complementary pair. I think you'll be hard pressed to find specific- rated 2SJ44 by the original manufacturer NEC. I'm guessing you're amenable to pulls? If you've got the stomach for it, you could try ebay. some years ago before the fakes got really bad, I got some true 2SK163 & 2SJ44 pulls from ebay that were good.
Good luck!
Good luck!
Hey, thanks for the interfet sheet mlloyd! I wasn’t aware of that one. Definitely ok with pulls, and I’ve been keeping my eyes peeled on auction sites, etc.
I’ll admit that its more of an interest to try them out, nothing I’m obsessing over. Tried out the 163s, liked them, and figured it could be fun to try with the P channel.
I’ll admit that its more of an interest to try them out, nothing I’m obsessing over. Tried out the 163s, liked them, and figured it could be fun to try with the P channel.
i hear you. i've never bought any interfet parts. i've heard they are expensive, but when you gotta' have it ...
I have some 2SJ45's. Specs are almost identical to 2SJ44 (except for the noise voltage). If you want to give them a try, I have a few matched quad ones with an Idss range like your 2SK163.
BTW, are you sure those 2SK163's you have has an Idss rank of N?
Based on the Idss samples you've got, they should fall into the rank L.
BTW, are you sure those 2SK163's you have has an Idss rank of N?
Based on the Idss samples you've got, they should fall into the rank L.
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@bango Thanks for the offer and info! I took another look and you’re absolutely right - mine are L grade. I may take you up on the J45 offer. I’ll reach out in a few days and see if we can work something out.
@Rodeodave thanks for datasheet! Happen to have K163? I’ve only found a table view of NEC jfets, with limited data on each offering.
@Rodeodave thanks for datasheet! Happen to have K163? I’ve only found a table view of NEC jfets, with limited data on each offering.
Saw this one on ebay. https://www.ebay.com/itm/3867768443...customid=54a0385a-e926-11ee-8fd6-306138303231
Thanks @Rodeodave! My googling skills need work…
@Jacruzer787 Thanks for sharing! I saw this one, but only when I thought I was looking for N grade. Another member shared a Japanese distributor that has some, so I’m giving that a try at the moment.
@Jacruzer787 Thanks for sharing! I saw this one, but only when I thought I was looking for N grade. Another member shared a Japanese distributor that has some, so I’m giving that a try at the moment.
For those that know more about the NEC jfets, did they make a similar, low-noise version with higher Yfs?
No worries brother. The Japanese distributor might be a safer bet to reduce getting ripped off by fakes. Just curious, what exactly are to trying to do? Your own design?
No big plans, to be honest. I’d just picked up the K163’s at a good price, and it sent me down the rabbit hole of wanting to try these parts in a few pre-existing circuits.
NEC released 2SK130 in the late 1970's when MC carts were booming. Its Yfs was larger than the famous Toshiba 2SK170 and smaller than the 2SK147 (i.e., somewhere in between). It is probably the 3-parallel equivalent of 2SK163. However, they did not release a Pch J-FET equivalent to that complement.
NEC made only one complementary pair J44-K163 (Low Noise) - in the properly designed circuit they will
be connected on AC in parallel, so the noise level will be reduced to a very reasonable low level.
In the n-channel group the next level in Yfs will be 2SK130(A - for low noise) and 2SK131 -dual,
and then 2SK162, 2SK194 - dual.
Pioneer matched 2SK194 and 2SJ61-from Mitsubishi, in their M-10 amp, (I don't know about their C-10 pre),
but to find those J61 is impossible, even fakes...
If you really interested in the complementary jfet pairs, I recommend to acquire p-ch 2SJ45 (L, M, N),
and measure their Yfs, and then find the matching n-ch part.
be connected on AC in parallel, so the noise level will be reduced to a very reasonable low level.
In the n-channel group the next level in Yfs will be 2SK130(A - for low noise) and 2SK131 -dual,
and then 2SK162, 2SK194 - dual.
Pioneer matched 2SK194 and 2SJ61-from Mitsubishi, in their M-10 amp, (I don't know about their C-10 pre),
but to find those J61 is impossible, even fakes...
If you really interested in the complementary jfet pairs, I recommend to acquire p-ch 2SJ45 (L, M, N),
and measure their Yfs, and then find the matching n-ch part.
Attachments
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