Successors for V-FET SONY-Yamaha-TOKIN 2SJ28, 2SJ18/2SK60, 2SJ26/2SK76 and 2SK180 - Page 3 - diyAudio
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Old 12th August 2009, 06:34 PM   #21
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Quote:
Originally posted by h_a
Where do you have this circlotron from?
from - Shinichi-Kamijo go to
http://www.ne.jp/asahi/evo/amp/CSPP/2SJ18.htm
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Old 12th August 2009, 06:54 PM   #22
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I'm not entirely sure this is even possible, but I'll bounce it off
the wall and see what sticks anyhow...


What if you abuse a 4 terminal MOSFET with separate connection
for substrate? And wire that to a resistive divider spanning from
drain to source... Does this sufficiently fake the space charge
effect that defines Mu? Would such a divider need an emitter
follower to drive the capacitance of the subtrate/body?

I think this body "diode" is forward biased when pulled higher
than drain? There might need to be a negative DC offset? maybe
a battery or something...

Its essentially a big unused JFET gate (depletion mode?) on the
flip side of the channel....

We abuse the old O.H.Schade method of bending a Pentode set
of curves into a Triode. Faking the distributed control surface of
a Triode's space charge with an external feedback network.

See Figure #35 if you have his paper "Beam power tubes".

Once you have emulated a Triode, you have emulated a V-FET.
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Old 12th August 2009, 08:21 PM   #23
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For those interested, I have started a new thread to discuss the SiC JFETs mentioned above here:

SemiSouth Power SiC JFETs
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Old 12th August 2009, 08:30 PM   #24
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Quote:
Originally posted by kenpeter

What if you abuse a 4 terminal MOSFET with separate connection
for substrate? And wire that to a resistive divider spanning from
drain to source... Does this sufficiently fake the space charge
effect that defines Mu? Would such a divider need an emitter
follower to drive the capacitance of the subtrate/body?

You can drive the whole MOSFET by an additional follower.

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Old 13th August 2009, 01:41 AM   #25
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Thats not quite what I meant (about driving the substrate)...
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Old 13th August 2009, 01:52 AM   #26
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Quote:
Originally posted by kenpeter
Thats not quite what I meant (about driving the substrate)...
I know. It would save a lot of power.
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Old 27th August 2009, 10:28 PM   #28
Helmuth is offline Helmuth  Netherlands
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I bought 4X 2sj18 and 4x 2sk60 on ebay NOS and it works great again.

V-fet Repair of a WEGA V4810 solid state heaven

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Old 6th February 2010, 10:41 AM   #29
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The extremely rare 2sj28/2sk82 for the TA_N88b and the 2sj18/2sk60 are offered on ebay all the time. I own a ta-n7b working with the 2sj18/2sk60 ranking 52 and 53 and works perfectly. So are the even rarer sansui Ba-1000 NEC v-fets (2sj20/2sk70). My Sansui Ba-1000 has been slightly modified to work great with sony 2sj18/2sk60 v-fets.
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Old 13th April 2010, 12:49 PM   #30
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are there successors from currently production in the meantime?
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