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Hi-Voltage JFET's
Hi-Voltage JFET's
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Old 4th October 2010, 01:38 PM   #51
alexberg is offline alexberg
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://irls.narod.ru/unch/unch26_1.htm
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Please compare I-V curves with the ones of DN3545.
Are not they different...
No positron tubes either...
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Old 4th October 2010, 02:27 PM   #52
EUVL is offline EUVL  Europe
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> http://www.supertex.com/pdf/datasheets/DN3545.pdf

I am so sorry but a depletion mode MOSFET is not a JFET.


Patrick
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Old 5th October 2010, 07:01 AM   #53
padamiecki is offline padamiecki  Poland
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Originally Posted by EUVL View Post
I am so sorry but a depletion mode MOSFET is not a JFET. Patrick
yes
but it seems like does not need gate positive voltage biasing,
which reminds biasing of tubes and njfets,
and
so what that it is not jfet when it acts like jfet? maybe slightly different transconductance curve which is more like pentode...
anyway I am going to build Aikido with them
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Old 5th October 2010, 08:44 AM   #54
alexberg is offline alexberg
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Quote:
Originally Posted by padamiecki View Post
yes
but it seems like does not need gate positive voltage biasing,
which reminds biasing of tubes and njfets,
and
so what that it is not jfet when it acts like jfet? maybe slightly different transconductance curve which is more like pentode...
anyway I am going to build Aikido with them
The "KeyPi"926 is SIT(static induction beast) like a SS triode
simple JFET is a SS "pentode"
Deplition mode MOSFET has particular input capacitance "feature" dissimilar to one of junction based devices
Lateral MOSFETS are better then "standard" vertical double diffusion MOSFETs
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Old 5th October 2010, 09:18 AM   #55
padamiecki is offline padamiecki  Poland
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Quote:
Originally Posted by alexberg View Post
The "KeyPi"926 is SIT(static induction beast) like a SS triode
simple JFET is a SS "pentode"
Deplition mode MOSFET has particular input capacitance "feature" dissimilar to one of junction based devices
Lateral MOSFETS are better then "standard" vertical double diffusion MOSFETs
agree
but vertical types are used in many good amps
and of course if you do not like them
do not use them
I will
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Old 16th August 2012, 04:44 PM   #56
EternaLightWith is offline EternaLightWith  United States
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They're HERE!
SiC Transistors | Semisouth Laboratories, Inc.

Quote:
Originally Posted by StevenOH View Post
(It is interesting to compare the characteristics of V-JFET and SIT - SIT is more triode-like and uniform.)
SIT Power Amplifier - this page starts with readers' complain about the difficulty of finding the 2SK180 (in Japan!). Again, the B2B sites will tell you, if it still available...
As it was mentioned before (on this forum and elsewhere), there are several companies working currently on the development of Silicon Carbide SIT. Yes, the interest is there. But, it will take time...
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Old 16th August 2012, 05:46 PM   #57
ilimzn is offline ilimzn  Croatia
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Originally Posted by StevenOH View Post
It is also looks like the memory of HV/Power JFETs of the '70's is not going away. Those were Vertical JFETs with output characteristics of "triode" type (very low output impedance), as opposite to all other JFETs and MOSFETs with "pentode" type characteristics (high output impedance).
Those compl. pairs are:
2SJ18 - 2SK60, ~63 W, 170 V, Sony,
J19 - K69, 800 mW (at 150C), 140 V, TO-5, NEC
J20 - K70, ~100 W, 100 V, NEC
J21 - K71, 15 W, 160 V, TO-66, NEC
??? - K75, TO-66, Yamaha
J26 - K76, ~100 W, 200 V, Yamaha
J27 - K77, ~100 W, Yamaha
J28 - K82, ~100 W, 240 V, Sony
J29 - K89, ~100 W, 110 V, Hitachi
J38 - K98, from Yamaha, used in their organs, so organ repair services may have it. (I hope, they are complimentary).
There was a complementary of the Yamaha K75, J25. It's not actually not truly complementary, rather a P-ch part with the same basic voltages and currents but lower mu.
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