JFETs from Linear Systems

Jason · 03:19 AM

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 it’s not a big deal.

Neville · 26th September 2013, 06:30 PM

Hi Jason I was curious if we bought jfets from Linear Systems, would each one be individually marked by its idss such as 7mA?

Jason · 07:09 PM

Quote:

Originally Posted by Neville

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

philbyx · 02:09 PM

Quote:

Originally Posted by Neville

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

Backbones · 5th October 2013, 10:51 AM

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.

Zen Mod · 5th October 2013, 10:54 AM

BL

Backbones · 5th October 2013, 11:45 AM

Thanks Zen
So that is B for the LSJ74 and LSK170 then?

2 picoDumbs · 6th October 2013, 01:42 AM

What ever gives you idss or around 8mA to 10mA is a good figure

RollE2k · 6th October 2013, 03:46 AM

Great to hear, but damn those lsj74's were expensive. Especially if you need a few of them matched...

Warmsound · 8th October 2013, 04:50 PM

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?

5th October 2013, 10:54 AM	#6
Zen Mod Official Court Jester diyAudio Member 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

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

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	375	2nd April 2018 01:27 AM
Hello from Linear Systems	Linear Systems	Introductions	3	20th March 2006 11:57 PM
P-channel JFETs more linear?	lazthegaz	Solid State	27	29th June 2004 01:50 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

26th September 2013, 06:30 PM	#2
Neville 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?

5th October 2013, 10:51 AM	#5
Backbones 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.

5th October 2013, 11:45 AM	#7
Backbones diyAudio Member Join Date: Sep 2008	Thanks Zen So that is B for the LSJ74 and LSK170 then?

6th October 2013, 01:42 AM	#8
2 picoDumbs diyAudio Member Join Date: Sep 2013	What ever gives you idss or around 8mA to 10mA is a good figure

6th October 2013, 03:46 AM	#9
RollE2k 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...

8th October 2013, 04:50 PM	#10
Warmsound 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?