jfet 2sk68a replacement.......

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mosfet1

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Joined 2006
#1
I must repair phono board of Luxman L-10.........
The j-fet 2sk68a (nec) are impossible to find here in Italy.....
What is the direct (or very close replacement) for those jfet's?

With bf 244 it' a mess and they burn because the Vds max are a little under correct value and Vgsoff it's different than 2sk68a and I can't set correctly and easy the offset voltage of the board that became very instable .....

I need the data sheet of 2sk68a (pdf) because i've only few data....

Thanks a lot.
walter 🙂🙂🙂🙂🙂🙂🙂
 
#5
#7
EUVL said:
Why not just google, like everyone else ?
2SK101-200
2SJ11-100
Patrick
Click to expand...
Thank you for this short form data and equivalent tables. The InterFET datasheets I have also. But I need original NEC datasheet of 2SK163 und 2SJ44 include the usual diagrams. Not to find on the web -
unfortunately you haven't read exactly my question in my previous post
(or you thought seriously that I had never heard of "Google" to find appropriate hits?).
 
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#9
EUVL said:
Another 15 minutes googling, when I was finally motivated to :

http://www.necel.com/nesdis/image/TC-5409.pdf
http://www.necel.com/nesdis/image/TC-3344A.pdf


Cheers,
Patrick


PS
The figures are obvious enough even if you can't read Japanese.
No English version for 2SK163 from the NEC archive.

.
Click to expand...

Thank you very much. NEC add some additional vintage jFET datasheets at their own archive in the last months - this was new for me.
Unfortunately only the 2SK163 goes open. the pdf URLs from NEC about 2SJ44 about the URL's
http://www.necel.com/nesdis/image/TC-3344A.pdf and
[NEC Electronics]Document Information
don't goes open.
Do you know the title of the original NEC data book inside this both types ?
 
#12
These are all very interesting and useful parts. The big problem is attempting to get a Gm match at a specific current between an N (usually easy to get) and any P that you can find. It is not ABSOLUTELY necessary to match Gm with a comp-diff jfet input stage, but it helps.
 
#14
EUVL said:
Both links just tested and worked OK.
You can send me a PM so that I can send you the pdf. Too large for here (2MB).Patrick
Click to expand...

By another guy in my aera this both links worked, too (he use another browser). He perform the download for me and send me via e-mail.
Now I am happy to have this orig. NEC datasheet search a long time. Thank you again for your efforts to discover this by NEC.
Two years ago even NEC in Japan itself wasn't able to send me this data sheets (only the copies from the comparable and short form data books) and recommend me to go to INTERFET.

Obviously in the meantime these data sheets NEC has been found by accident and then immediately made available as PDF on their archive website. But I still don't find this one about "Datasheetarchive" and "Alldatasheet".
 
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#15
NEc must have had some quirk with a server, I just tried the link again and this time it worked well enough, I dont think think it has anything to do with browsers but who knows between the browser wars going on......

Hope to get some comments about interfet Jfets, surely someone from this forum must have tried them.
 
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