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A small group buy of 2SJ74BL/2SK170BL

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es44

es44

Member
Joined 2005
Well, of course there's a lot of "spread", and i have very few excactly matches. But if a few tens of uA is acceptable, then i have quite a few close ones :D
Funny thing is, that the 170's have idss between approx. 6.5 to 11, and the 74' generally 1.5-2 mA higher.
 
H

housing

Member
Joined 2006
es44 said:
Well, of course there's a lot of "spread", and i have very few excactly matches. But if a few tens of uA is acceptable, then i have quite a few close ones :D
Funny thing is, that the 170's have idss between approx. 6.5 to 11, and the 74' generally 1.5-2 mA higher.
Click to expand...

A few tens of uA? That's better than 1% match! :D

Jfet are good devices but their characteristics are very variable. That makes you love them and hate them. :D
 
es44

es44

Member
Joined 2005
housing said:


A few tens of uA? That's better than 1% match! :D

Jfet are good devices but their characteristics are very variable. That makes you love them and hate them. :D
Click to expand...

Yes, i know the match is very tight on some of them, i'm just not used to Fet's, and therefore maybe a little too hysterical, hehe.
I do have a project coming up. A simple Riaa, and that will be my first experience with these little bugs. I hope to get a better understanding of what's going on when this is completed.

http://www.diyaudio.com/forums/showthread.php?s=&threadid=129126&perpage=25&pagenumber=1

Once my GF is satisfied with her new apartment, i might get around to spend a little more time here.:D

All the best
Ebbe
 
A

AndrewT

R.I.P.
Joined 2004
housing said:
Did you get a lot of closely matched quads?
Click to expand...
I have just matched pairs from 200off each LSK170A & B & C (600 total).
I got lots of pairs but not a single quad from the Bs & Cs. The As have such a wide spread(2.6mA to 6.5mA=2.5:1) I am finding it galling just how low the yield is, of pairs, from a 200batch.

The problem is not just matching Idss, but also matching Yfs by testing for a match at lower currents as well.
 
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