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kees52 25th March 2012 07:25 PM

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

for audio use afcourse.

thanks.

HOPHANTHIET 26th March 2012 06:26 PM

Quote:

Originally Posted by kees52 (http://www.diyaudio.com/forums/parts/209554-fets-post2959942.html#post2959942)
Who now what kind of small jfets are stil manufacured, like the j74 2sk170 etc.

for audio use afcourse.

thanks.

LINEAR SYSTEM

Osvaldo de Banfield 26th March 2012 06:33 PM

MPF102, BF245, 2SK117, 2SK427... There are many of them...

AndrewT 26th March 2012 06:35 PM

But few, if any, are like j74/k170 and still in production.

yero 26th March 2012 06:47 PM

Andrew, I just purchased some 2sk170 from a Chineese component disthibutor, how can you determine if they are fake.

kees52 26th March 2012 07:42 PM

Quote:

Originally Posted by yero (http://www.diyaudio.com/forums/parts/209554-fets-post2961049.html#post2961049)
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.

AndrewT 26th March 2012 08:43 PM

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

AndrewT 26th March 2012 08:46 PM

Quote:

Originally Posted by kees52 (http://www.diyaudio.com/forums/parts/209554-fets-post2961135.html#post2961135)
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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