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.

Replacement For Toshiba 2SK170/2SJ74
Replacement For Toshiba 2SK170/2SJ74
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 5th August 2018, 08:08 PM   #211
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
IV curves :
xen-audio

Why match :
xen-audio


Patrick
__________________
xen-audio.com
  Reply With Quote
Old 5th August 2018, 08:30 PM   #212
MEPER is offline MEPER  Denmark
diyAudio Member
 
Join Date: Nov 2017
Location: Copenhagen
When Idss is measured at what Vds should that normally be done to get a "standardized" value for Idss? …..a Vds just before break down to get the max Ids?
Some use 9V.....but that is because they use a 9V battery for the measurement?
  Reply With Quote
Old 5th August 2018, 11:00 PM   #213
Mark Johnson is offline Mark Johnson  United States
diyAudio Member
 
Mark Johnson's Avatar
 
Join Date: May 2011
Location: Silicon Valley
Replacement For Toshiba 2SK170/2SJ74
Quote:
Originally Posted by MEPER View Post
When Idss is measured at what Vds should that normally be done to get a "standardized" value for Idss? ..a Vds just before break down to get the max Ids?
Some use 9V.....but that is because they use a 9V battery for the measurement?
It's completely your choice, do it however you please.

Me, I like to get far away from the knee and the linear region. So I prefer to measure well above ~ 4 x |Vpinchoff| which ensures I'm well away from the knee.

For the 2SJ74 in Toshiba's datasheet, that's something well above ~ 3.6 volts. 9 volts is certainly well above 3.6 volts. Naturally, other designers may interpret the data differently, or arrive at a different final preference.

_
Attached Images
File Type: png curve1.png (54.2 KB, 861 views)
File Type: png curve2.png (45.4 KB, 857 views)
  Reply With Quote
Old 6th August 2018, 06:41 AM   #214
MEPER is offline MEPER  Denmark
diyAudio Member
 
Join Date: Nov 2017
Location: Copenhagen
Ok....so 9V Vds could be a real operation condition in an amplifier.
Would the curves had looked "nicer" if there was same distance between them so a change in Vgs gave same change in Ids?
I am still at a "FET learning curve" :-)
  Reply With Quote
Old 27th August 2018, 02:45 PM   #215
eddyvb is offline eddyvb  Belgium
diyAudio Member
 
Join Date: Jul 2012
Location: Antwerp
On request from RafaPolit


Do you think these are fakes? Reichelt is a big German company.
2SK 170: JFET, N-CH, 40V 20mA, 0,4W, TO-92 bei reichelt elektronik


I think they ship worldwide. Or I could buy a few if you want.
To be sure you must be able to make fet noise measurements?
  Reply With Quote
Old 27th August 2018, 03:08 PM   #216
Dennis Hui is offline Dennis Hui  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: Toronto, Canada
Replacement For Toshiba 2SK170/2SJ74
A member received fake 2sj74bl from Reichelt:

Replacement For Toshiba 2SK170/2SJ74

That said, the 2sk170 seems to be easier to find, but I would
still suggest caution and test a few samples before ordering in quantity.
__________________
We are fearless amplifier builders. A little heat doesn't scare us at all.
- NP 2002
  Reply With Quote
Old 27th August 2018, 03:12 PM   #217
Zatopek is offline Zatopek  Germany
diyAudio Member
 
Zatopek's Avatar
 
Join Date: Aug 2004
Location: Munich area, Germany
Default Procurement of 2SK170/2SJ74 pairs

I have purchased the 2SK170/2SJ74 from Reichelt and can assure that the once I received DO NOT work as input stage in the BA3!!!
The price of about 4,- was just too attractive but it was impossible to set the biasing of the output MOSFET's at all. Complete failure and hours of frustration wasted!! This was about in April this year and they might have changed their source.

Meanwhile I have purchased matched pairs through NicMac in Milano. These are original Tosh's and of course NicMac has to take more than 4,-. Good message is, that I had biased both channels of my BA3 within about 1hr within the ballpark range you like the bias to be in. Perfect stuff!!
__________________
Elektor Crescendo-ScanSpeak d'Appo-F5TV2
  Reply With Quote
Old 27th August 2018, 03:19 PM   #218
NicMac is offline NicMac  Italy
diyAudio Member
 
NicMac's Avatar
 
Join Date: Feb 2009
Replacement For Toshiba 2SK170/2SJ74
And @ 3.20 euro a piece, its not really a bargain.
  Reply With Quote
Old 27th August 2018, 04:28 PM   #219
6L6 is offline 6L6  United States
diyAudio Moderator
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Replacement For Toshiba 2SK170/2SJ74
The Reichert 2SJ74 are GR grade and won’t match the BL K170s they are selling.
  Reply With Quote
Old 27th August 2018, 09:07 PM   #220
Skylar88 is online now Skylar88  South Africa
diyAudio Member
 
Join Date: Jun 2017
Location: Pretoria
After posting in the ACA thread, I thought that I should mention it here too.

I have ready access to genuine Toshiba 2SK170BL's and would be willing to match and supply if needed. No 2SJ74's unfortunately.

I have built a B1 and ACA with pairs that I matched myself. So far I found pairs with Idss between 6.9mA and 10.0mA. If there is a need for quads, I can probably do that too.
.
  Reply With Quote

Reply


Replacement For Toshiba 2SK170/2SJ74Hide 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
Toshiba 2SK170/2SJ74 FET's and other semis for sale duffears Vendor's Bazaar 63 6th December 2016 01:27 PM
Swapping matched for unmatched Toshiba 2SK170 / 2SJ74 Jfets NicMac Swap Meet 4 30th October 2016 06:16 PM
2SK170 2SJ74 F-5 BOM?????? paul stewart The diyAudio Store 5 19th July 2013 07:04 AM
FS 2sj74 and 2sk170's take 2 :) Woody1911a1 Swap Meet 43 28th August 2011 09:33 PM
2sk170, 2sj74 enzedone Parts 4 21st December 2008 05:38 AM


New To Site? Need Help?

All times are GMT. The time now is 07:53 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki