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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 (Post 2959942)
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 (Post 2961049)
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 (Post 2961135)
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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