Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

Tokin SIT DEFiSIT musings
Tokin SIT DEFiSIT musings
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 4th February 2020, 04:55 PM   #41
Nelson Pass is offline Nelson Pass  United States
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Tokin SIT DEFiSIT musings
Quote:
Originally Posted by N101N View Post
The name SIT has been the source of great confusion. Only certain depletion mode devices with a high cutoff voltage will display the distinctive character. These V(groove)FETs have a vertical structure and an insulated gate while JFETs have a gate-channel P-N junction diode.
The SITs that I have conduct current from Gate to Source if you apply
more than 0.6 volts, so I have to assume we are dealing with P-N
junctions.
  Reply With Quote
Old 4th February 2020, 08:56 PM   #42
MarsBravo is offline MarsBravo  Netherlands
diyAudio Member
 
MarsBravo's Avatar
 
Join Date: Feb 2017
Location: NL
Quote:
Originally Posted by claudio52 View Post
...Vos went up and then back down...
Pot R4-R5 adjusts M1 and J1, where pot R2 adjusts J1 only. Given the different temp specs, a swing of settings is not surprising.
How does the Vdc at the sources respond during warming up?
__________________
Y/Yo=(1-X/Xo)exp2 <> Y/Yo=(e)exp(X/Xo){Xo=kT/q}
  Reply With Quote
Old 4th February 2020, 10:29 PM   #43
woofertester is offline woofertester  United States
diyAudio Member
 
Join Date: Jun 2011
Quote:
Originally Posted by N101N View Post
Cutoff voltage is the gate to channel bias voltage reducing conduction. In the case of enhancement mode FETs it is called threshold voltage.
That was not my question. You said "high cutoff voltage". How high, in volts? What low in volts to be a low cutoff voltage?

Last edited by woofertester; 4th February 2020 at 10:33 PM.
  Reply With Quote
Old 5th February 2020, 01:15 AM   #44
N101N is offline N101N
diyAudio Member
 
Join Date: May 2018
Sorry. For the 2SK60 / 2SJ18, roughly, 14V gives 100mA.
  Reply With Quote
Old 5th February 2020, 01:58 AM   #45
woofertester is offline woofertester  United States
diyAudio Member
 
Join Date: Jun 2011
Quote:
Originally Posted by N101N View Post
Sorry. For the 2SK60 / 2SJ18, roughly, 14V gives 100mA.
My measurements have the Tokin 2SK182/THF cutoff voltage much lower than the 2SK60/2SJ18/2SJ20.

Nelson's DEFiSIT design matches the Semisouth SIT Vgs to an ordinary Harris 9240 Vgs.
  Reply With Quote
Old 5th February 2020, 03:07 AM   #46
N101N is offline N101N
diyAudio Member
 
Join Date: May 2018
The 2SK182 is a limitedly exciting enhancement mode transistor meant to be used as a switch.
  Reply With Quote
Old 5th February 2020, 04:58 AM   #47
woofertester is offline woofertester  United States
diyAudio Member
 
Join Date: Jun 2011
Quote:
Originally Posted by N101N View Post
The 2SK182 is a limitedly exciting enhancement mode transistor meant to be used as a switch.
One man's enhancement switch is another man's depletion triode-ish JFET.
Attached Images
File Type: jpg 2SK182.jpg (41.0 KB, 173 views)
  Reply With Quote
Old 5th February 2020, 06:23 AM   #48
N101N is offline N101N
diyAudio Member
 
Join Date: May 2018
Frankly, I don`t think that the 2SK182 is any better than the IRF MOSFETs, but the 2SK60 / 2SJ18 is a truly remarkable technical and technological achievement. The 2SK182 and the 2SK60 / 2SJ18 have nothing whatsoever in common.
  Reply With Quote
Old 5th February 2020, 04:32 PM   #49
twitchie is offline twitchie  Canada
Magic Smoke Liberator
diyAudio Member
 
Join Date: Jul 2004
Location: Toronto
Tokin SIT DEFiSIT musings
Quote:
Originally Posted by N101N View Post
Frankly, I don`t think that the 2SK182 is any better than the IRF MOSFETs, but the 2SK60 / 2SJ18 is a truly remarkable technical and technological achievement. The 2SK182 and the 2SK60 / 2SJ18 have nothing whatsoever in common.
The most striking difference being that one is extinct while the other is freely available on the open market (at DIY volumes) although, admittedly declining.

This is DIY, not commercial so as long as we can get our hands on them, the journey is part of the fun right?

I guess the other aspect to consider is - how do they actually end up sounding?

I haven't heard both so will withhold comment but other forum members have heard both and I know of at least 1 (fellow Canadian) who prefers his Tokin implementation over his Sony one.

If I could get hold of 2SK60/2SJ18 I would not hesitate.

Last edited by twitchie; 5th February 2020 at 04:35 PM.
  Reply With Quote
Old 5th February 2020, 09:04 PM   #50
woofertester is offline woofertester  United States
diyAudio Member
 
Join Date: Jun 2011
Quote:
Originally Posted by N101N View Post
Frankly, I don`t think that the 2SK182 is any better than the IRF MOSFETs, but the 2SK60 / 2SJ18 is a truly remarkable technical and technological achievement. The 2SK182 and the 2SK60 / 2SJ18 have nothing whatsoever in common.
What is measurably different between the 2SK60 and the 2SK182 that would make a difference in an amplifier circuit? I have some of each transistor and I have access to a modern calibrated curve tracer. I will be happy to explore your assertion and post results here.
  Reply With Quote

Reply


Tokin SIT DEFiSIT musingsHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans Zen Mod Pass Labs 874 16th February 2019 03:49 PM
THF-51T old used 5pcs passed the test TOKIN from VGS= 4.3v ... pras1170 Vendor's Bazaar 9 21st December 2018 04:49 AM
FS Tokin THF-51S NOS dBel84 Swap Meet 0 22nd September 2018 08:32 PM
FS. TOKIN SIT 2SK180,2SK180C,TOKIN 2SK 180 D joshvi Swap Meet 46 24th August 2018 04:58 AM
NOS TOKIN 2SK180 V FETish Swap Meet 0 21st January 2018 09:57 AM


New To Site? Need Help?

All times are GMT. The time now is 06:16 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki