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Old 25th March 2012, 06:25 PM   #1
kees52 is offline kees52  Netherlands
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Default j fets

Who now what kind of small jfets are stil manufacured, like the j74 2sk170 etc.

for audio use afcourse.

thanks.
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Old 26th March 2012, 05:26 PM   #2
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Quote:
Originally Posted by kees52 View Post
Who now what kind of small jfets are stil manufacured, like the j74 2sk170 etc.

for audio use afcourse.

thanks.
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Old 26th March 2012, 05:33 PM   #3
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MPF102, BF245, 2SK117, 2SK427... There are many of them...
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Old 26th March 2012, 05:35 PM   #4
AndrewT is offline AndrewT  Scotland
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But few, if any, are like j74/k170 and still in production.
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Old 26th March 2012, 05:47 PM   #5
yero is offline yero  United States
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Andrew, I just purchased some 2sk170 from a Chineese component disthibutor, how can you determine if they are fake.
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Old 26th March 2012, 06:42 PM   #6
kees52 is offline kees52  Netherlands
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Andrew, I just purchased some 2sk170 from a Chineese component disthibutor, how can you determine if they are fake.
yes I want also now.

so 2sk170 j74 is stilin production, that is interesting.


thanks.
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Old 26th March 2012, 07:43 PM   #7
AndrewT is offline AndrewT  Scotland
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Start by measuring Idss.
Then measure and plot Id vs Vgs.
But don't complain if your measurements don't exactly match Toshiba's.
They state Tc=25degC and duty cycle such that Tj is also pretty close to 25degC.
And they hold Vds=10V
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Old 26th March 2012, 07:46 PM   #8
AndrewT is offline AndrewT  Scotland
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Originally Posted by kees52 View Post
so 2sk170 j74 is still in production,
I don't think so.
I believe j74 has already gone obsolete.
I further believe that k170 is about to go obsolete.
Toshiba put out notice that k170 production was due to stop soon, many months ago.
I would not be surprised that having received a few million pre-production orders of intent that that production run has now been completed and that there will be no more k170.
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