JFETs from Linear Systems - diyAudio
Go Back   Home > Forums > Commercial Sector > The diyAudio Store

The diyAudio Store A forum for discussing anything about the products available in The diyAudio Store.

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 26th September 2013, 04:55 PM   #1
Jason is offline Jason  Australia
:)
diyAudio Administrator
 
Jason's Avatar
 
Join Date: Oct 2000
Location: Melbourne
Blog Entries: 1
Default JFETs from Linear Systems

Exciting news! The diyAudio store is now the exclusive distributor for limited quantities of LSK170 and LSJ74 JFETs from Linear Systems.

Watch the announcement from Linear Systems on YouTube!

Please post any questions you have in this thread. We'll be posting information shortly about the difference between the grades. Depending on your application, different grades may be the most suitable.

A comment from Nelson on grades:

Quote:
Originally Posted by Nelson Pass
The B through D and most of the A would not be a problem for the ACA, and a slight adjustment would allow down to the 2.5 mA figure without problems. Most of my projects would want a B or C grade as most desirable, but itís not a big deal.

Last edited by Jason; 6th February 2014 at 02:19 AM. Reason: Added comment from Nelson
  Reply With Quote
Old 26th September 2013, 05:30 PM   #2
Neville is offline Neville  United States
diyAudio Member
 
Join Date: Jul 2004
Location: Georgia
Hi Jason I was curious if we bought jfets from Linear Systems, would each one be individually marked by its idss such as 7mA?
  Reply With Quote
Old 26th September 2013, 05:56 PM   #3
Jason is offline Jason  Australia
:)
diyAudio Administrator
 
Jason's Avatar
 
Join Date: Oct 2000
Location: Melbourne
Blog Entries: 1
Quote:
Originally Posted by Neville View Post
Hi Jason I was curious if we bought jfets from Linear Systems, would each one be individually marked by its idss such as 7mA?
It won't be marked.

LIS marks the parts prior to final test with just the part family number. LIS does not mark the grade on the part. Toshiba in the past marked the part with a colored dot:

LSK170A=GR (green)
LSK170B=BL (blue?)
LSK170C=V (violet)
LSK170D=toshiba never offered this grade of idss
LSK170E=toshiba never offered this grade of idss

LSJ74A=GR (green)
LSJ74B=BL (blue?)
LSJ74C=V (violet)
LSJ74D=toshiba never offered this grade of idss
LSJ74E=toshiba never offered this grade of idss

Last edited by Jason; 26th September 2013 at 06:09 PM.
  Reply With Quote
Old 4th October 2013, 01:06 PM   #4
philbyx is offline philbyx  France
diyAudio Member
 
philbyx's Avatar
 
Join Date: Mar 2004
Location: near Paris
Quote:
Originally Posted by Neville View Post
Hi Jason I was curious if we bought jfets from Linear Systems, would each one be individually marked by its idss such as 7mA?
I had samples in the past from Linear System (LSK170 and dual jfets LSK389)
They are marked A B or C concerning Idss, corresponding to GR BL and V in the former K170 K389 from Toshiba

Last edited by philbyx; 4th October 2013 at 01:09 PM.
  Reply With Quote
Old 5th October 2013, 09:51 AM   #5
diyAudio Member
 
Join Date: Sep 2008
Can someone explain which device grade A,B etc is best for BA3 front end. I would guess it is B but Nelson discussed sweet spots in his lecture.
  Reply With Quote
Old 5th October 2013, 09:54 AM   #6
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
BL
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 5th October 2013, 10:45 AM   #7
diyAudio Member
 
Join Date: Sep 2008
Thanks Zen
So that is B for the LSJ74 and LSK170 then?
  Reply With Quote
Old 6th October 2013, 12:42 AM   #8
diyAudio Member
 
Join Date: Sep 2013
What ever gives you idss or around 8mA to 10mA is a good figure
  Reply With Quote
Old 6th October 2013, 02:46 AM   #9
RollE2k is online now RollE2k  Sweden
diyAudio Member
 
Join Date: Nov 2007
Great to hear, but damn those lsj74's were expensive. Especially if you need a few of them matched...
  Reply With Quote
Old 8th October 2013, 03:50 PM   #10
diyAudio Member
 
Join Date: Mar 2009
Does anyone know what the odds are of finding a couple matched pairs of LSJ74's if one buys the minimum of 8?

Looks like Grade D is all that's available at the moment. Were the other grades available and just sold out?
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Group Buy: Linear Systems LSK389 / LSK170 JFETs (i.e. Toshiba 2sk389/2sk170 subs) luvdunhill Group Buys 354 20th May 2014 09:53 AM
Hello from Linear Systems Linear Systems Introductions 3 20th March 2006 10:57 PM
P-channel JFETs more linear? lazthegaz Solid State 27 29th June 2004 12:50 PM


New To Site? Need Help?

All times are GMT. The time now is 07:25 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2