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Old 27th March 2013, 10:14 PM   #41
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by tony399 View Post
That is so last century - but I love it!
... almost as much as getting my hands on cheap genuine 2SJ74!

Cheers,

Nic

P.S. Now measure and draw one for each of your FETs
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Old 27th March 2013, 10:16 PM   #42
tony399 is offline tony399  United Kingdom
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Quote:
Originally Posted by NicMac View Post
That is so last century - but I love it!
... almost as much as getting my hands on cheap genuine 2SJ74!

Cheers,

Nic

P.S. Now measure and draw one for each of your FETs
And who would pay for that?
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Old 1st April 2013, 05:51 PM   #43
dre73 is offline dre73  Netherlands
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is there any news?
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Old 2nd April 2013, 09:42 AM   #44
tony399 is offline tony399  United Kingdom
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Spent most of the bank holiday weekend rematching and that stage is finally all done now. Quite a task if anyone has tried matching 460 or so jfets!

The next step is to run some curve traces to prove they are genuine, my curve tracer should arrive Thursday. I have no reason to doubt they are Toshiba as I have made discrete opamps from these batches and no problems (they were purchased back in 2008 just as they were becoming rare which is, as I believe, before the rash of 'counterfets' anyway).

Then I will group them and PM people on the shortlist first.

There will be a restriction on the amount per person to help out as many as possible.

Will post results of curve tracer here but don't expect one per device!
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Old 4th April 2013, 06:32 PM   #45
tony399 is offline tony399  United Kingdom
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New toy arrived on time and easy to grasp so as promised.

K170 J74 curve trace set matched 10.05mA Idss.JPG

This is for a pair matched at 10Vds and 10.05mA Idss.
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Old 4th April 2013, 07:51 PM   #46
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Hey Tony!

They look quite good to my eyes.
Tony emailed me a couple more, also look very good.
Unlike the bogus ones that I recently got from asia, these seem to be spot on.

Cool.

_-_-bear
__________________
_-_-bear
http://www.bearlabs.com -- Btw, I don't actually know anything, FYI -- [...2SJ74 Toshiba bogus asian parts - beware! ]

Last edited by bear; 4th April 2013 at 07:56 PM.
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Old 4th April 2013, 07:59 PM   #47
tony399 is offline tony399  United Kingdom
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And here they are

K170 J74 curve trace set matched 6.75mA Idss at 10V.JPGK170 J74 curve trace set matched 7.84mA Idss at 10V.JPG

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Old 4th April 2013, 08:09 PM   #48
Salas is offline Salas  Greece
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I got 20-30pcs in a bag that I am a bit suspicious of. Here is one I picked at random. Have you got one near its Idss as estimated by DCA Pro so we can see about its Vgs (off), Yfs, and curves? Thanks.
Attached Images
File Type: png Snap 2013-04-04 at 22.57.24.png (20.5 KB, 438 views)
File Type: png Snap 2013-04-04 at 23.08.38.png (51.3 KB, 345 views)
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Old 4th April 2013, 08:31 PM   #49
tony399 is offline tony399  United Kingdom
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10.90mA Idss at 10V.JPG J74 curve trace 10.90mA Idss at 10V.JPG

J74 10.90mA Idss at 10v
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Old 4th April 2013, 08:46 PM   #50
Salas is offline Salas  Greece
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Thanks. Those in my ??? marked bag are bogus indeed. Very good try but fake.
They lack the slant, the low Vgs responsiveness. Those things are in the datasheet curves also. When their Yfs(gfs) and Vgs(off) still shows good. Yours being a bit less for gfs should be our room temp diff right now. Most Northwest and Southeast Europe stretch.
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