2SK194 dual Jfet for LTP input... - diyAudio
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Old 1st October 2015, 05:33 AM   #1
Junm is offline Junm  Philippines
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Default 2SK194 dual Jfet for LTP input...

I got 17 pieces of this old dual Jfet ...can somebody help me where to use this thing....I plan to use this as LTP input for power amp since they are pretty matched...

Does anybody has some schema to share or guide me to good working schematics...best if there's available PCB layout.

Thanks
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Old 1st October 2015, 06:05 AM   #2
AJT is offline AJT  Philippines
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Jun, know someone looking for those, will you be willing to sell a pair?

a phono stage can use those....
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Old 1st October 2015, 06:36 AM   #3
Junm is offline Junm  Philippines
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Quote:
Originally Posted by AJT View Post
Jun, know someone looking for those, will you be willing to sell a pair?

a phono stage can use those....
Yes sir i can share a pair...just PM me

I want them in an amp input and see what they do...i think sony use this as amp input....the 2sk147 is the half equivalent of this..
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Old 1st October 2015, 07:50 AM   #4
Calvin is offline Calvin  Germany
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Hi,

here´s a Datasheet from NEC.
On first glance it looks to be a superb MC-Inputstage device with its very low enoise and high gm.
Unfortunately those features also come with high input capacitance.
They are quite close to Toshibas SK369 and -apart from capacitance and speed- the single BF862.
If used in a MM-Input stage it needs to be cascoded, to keep input capacitance of the stage just acceptably low.
A I/V converter stage like EUVL´s Zen might also be a nice circuit for them.
I wouldn´t ´waste´ them for Input stage devices for a line level or power amp.

jauu
Calvin
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Old 1st October 2015, 08:03 AM   #5
Junm is offline Junm  Philippines
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Thanks...any schematics link for those...
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Old 1st October 2015, 02:37 PM   #6
AndrewT is offline AndrewT  Scotland
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I agree with Calvin.
Use them in something special and cascode them.
Have a look at Salas RIAA pre.
There will be others.

Oh and prove to yourself they are genuine start with the really easy Idss @ 5Vds (unusually low cf. the normal 10Vds used elsewhere). Follow up with Vp. Borbely shows a little jig for these two measurements.
Find those that make really good pairs. Batch them into mA Idss.
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Old 1st October 2015, 02:43 PM   #7
AndrewT is offline AndrewT  Scotland
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They would make great swap devices to someone willing to part with well matched k170/j74
A pair of these k194 could be worth a fair bit of money !
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Old 2nd October 2015, 02:19 AM   #8
Junm is offline Junm  Philippines
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I will set up a test Jig and see...these are sure genuine since they are from and old electronics store whom i accidentally found on disposal items wrapped in a nice anti static plastic.

Thanks andrew....I might swap the other for k170/j74 but my worries most of them are fakes...
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Old 2nd October 2015, 08:07 AM   #9
AndrewT is offline AndrewT  Scotland
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You must get a full money refund GUARANTEE including return postage before buying from anyone.

There are a few sellers here in the Forum.
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