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-   -   JFETs from Linear Systems (https://www.diyaudio.com/forums/the-diyaudio-store/243148-jfets-linear-systems.html)

Jason 26th September 2013 05:55 PM

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.


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 26th September 2013 06:56 PM

Quote:

Originally Posted by Neville (https://www.diyaudio.com/forums/the-diyaudio-store/243148-jfets-linear-systems-post3646072.html#post3646072)
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 4th October 2013 02:06 PM

Quote:

Originally Posted by Neville (https://www.diyaudio.com/forums/the-diyaudio-store/243148-jfets-linear-systems-post3646072.html#post3646072)
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?


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