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Pumpkin preamp - ordered by Steen , official making thread
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Old 5th December 2012, 10:17 PM   #3421
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Pumpkin preamp - ordered by Steen , official making thread
Hi Tony

easy peasy , for 2SJ109, matching by Idss :

source and gate to +9 (max 12V)

drain to mA meter red probe

mA meter black probe to gnd
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Old 6th December 2012, 03:51 PM   #3422
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Quote:
Originally Posted by Zen Mod View Post
Hi Tony

easy peasy , for 2SJ109, matching by Idss :

source and gate to +9 (max 12V)

drain to mA meter red probe

mA meter black probe to gnd
Hi Alex i have just tried and the results with 9v power voltage are this :

1 2sj109 91/92 mA

2 2sj109 53,5/53,5 mA

Please what do you think about different idss betwen 1 and 2 jfet?

I also have four 2sj74 bl 6g and i tried with same idss matching method.
the results are this:

1 2sj74 10,10mA
2 2sj74 10,10mA
3 2sj74 10,04mA
4 2sj74 10,07mA

Please can you advise me what to use for your Aleph J Babbelfish?

Thanks in advance

Last edited by tonimxp; 6th December 2012 at 04:19 PM.
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Old 6th December 2012, 04:10 PM   #3423
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Pumpkin preamp - ordered by Steen , official making thread
they're fakes

according to 2SJ109 datasheet , there are 3 groups of Idss for exactly same test setup :

GR , BL , and V

if you made test as I wrote ( see enclosed sketch) , they're fakes without doubts

look at 2Sj74 side , presume that Rs is zero , for your case of measuring (full) Idss

http://jm.plantefeve.pagesperso-orange.fr/2SJ109.pdf
Attached Images
File Type: jpg matching.JPG (17.7 KB, 207 views)
File Type: gif 2SJ109 class.gif (3.9 KB, 203 views)
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Old 6th December 2012, 04:28 PM   #3424
tonimxp is offline tonimxp  Italy
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Quote:
Originally Posted by Zen Mod View Post
they're fakes

according to 2SJ109 datasheet , there are 3 groups of Idss for exactly same test setup :

GR , BL , and V

if you made test as I wrote ( see enclosed sketch) , they're fakes without doubts

look at 2Sj74 side , presume that Rs is zero , for your case of measuring (full) Idss

http://jm.plantefeve.pagesperso-orange.fr/2SJ109.pdf
Yes my Rs is zero and my type are BL ,so...what should be the correct IDSS (if they were genuine) in my case, with 9V and without Rs?
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Old 6th December 2012, 04:35 PM   #3425
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Pumpkin preamp - ordered by Steen , official making thread
see picture above

6 to 12mA
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Old 6th December 2012, 04:50 PM   #3426
tonimxp is offline tonimxp  Italy
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Originally Posted by Zen Mod View Post
see picture above

6 to 12mA
I have to open a dispute on ebay, please with what voltage value (with my set up measurement) should get from -6 mA to-12mA Idss?
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Old 6th December 2012, 04:52 PM   #3427
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Pumpkin preamp - ordered by Steen , official making thread
as I said already - in range of 9 to 12V

what you got are probably re-labelled bjt's
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Old 6th December 2012, 07:01 PM   #3428
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Originally Posted by Zen Mod View Post
as I said already - in range of 9 to 12V

what you got are probably re-labelled bjt's
thanks Alex
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Old 6th December 2012, 07:56 PM   #3429
tonimxp is offline tonimxp  Italy
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So...about my four 2sj74 bl 6g

1 2sj74 10,10mA
2 2sj74 10,10mA
3 2sj74 10,04mA
4 2sj74 10,07mA

Are they ok to use for your Aleph J Babbelfish?

And about my post n3420 of this tread what do you think?

For 2sj310 (Q1 and Q2) of Pumpkin i have found those values of Vgs:

180-184-(187-188)-(193-196) mV so i have match as in parenthesis.
The current draw is set to 5mA for five minutes test time.

I have to ask you your comments for results.




Thanks in advance
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Old 6th December 2012, 09:21 PM   #3430
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Quote:
Originally Posted by tonimxp View Post
So...about my four 2sj74 bl 6g

1 2sj74 10,10mA
2 2sj74 10,10mA
3 2sj74 10,04mA
4 2sj74 10,07mA

Are they ok to use for your Aleph J Babbelfish?
perfect

just take care of pinout

Quote:
Originally Posted by tonimxp View Post
......
And about my post n3420 of this tread what do you think?

For 2sj310 (Q1 and Q2) of Pumpkin i have found those values of Vgs:

180-184-(187-188)-(193-196) mV so i have match as in parenthesis.
The current draw is set to 5mA for five minutes test time.

I have to ask you your comments for results.




Thanks in advance

they're good , of course

attached pic - view from top (as a bird ....... or Batman )
Attached Images
File Type: jpg 2sj109-to-2sj74.jpg (71.2 KB, 192 views)
__________________
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clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM

Last edited by Zen Mod; 6th December 2012 at 09:24 PM.
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