Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › LSK389 - the KGSS is buildable again!
New Posts  All Forums:Forum Nav:

LSK389 - the KGSS is buildable again!

post #1 of 15
10/21/09 at 1:39am
Thread Starter 
I just found this while surfing the internet.

Linear Integrated Systems - Press Release

If I'm not mistaken, this part is all that's missing from a KGSS solid state electrostatic headphone amp - combine with parts from major distributors and you're good to go!
Reply
post #2 of 15
10/21/09 at 2:25am
Press release date - January 12, 2006 and distributors still don't stock it.
Reply
post #3 of 15
10/21/09 at 3:31am
Quote:
Originally Posted by FallenAngel View Post
Press release date - January 12, 2006 and distributors still don't stock it.
And I just got all excited when I saw the title of this thread.
Reply
post #4 of 15
10/21/09 at 5:37am
You still have the problem of it only being SOIC-8 or thru-hole TO-71...
Reply
post #5 of 15
10/21/09 at 5:48am
You can just as well use matched pairs of 2SK170's to get much better matching then Toshiba ever did with the dual units. There are even special heatsinks to join them as a single unit for better thermal stability. You can also use a MAT02 with some small changes to the circuit as was documented in the KGSS article on Headwize.
Reply
post #6 of 15
10/21/09 at 11:19am
Thread Starter 
Quote:
Originally Posted by Uncle Erik View Post
And I just got all excited when I saw the title of this thread.
I know that it exists - there was a group buy on DIYaudio some time ago.
Quote:
Originally Posted by spritzer View Post
You can just as well use matched pairs of 2SK170's to get much better matching then Toshiba ever did with the dual units. There are even special heatsinks to join them as a single unit for better thermal stability. You can also use a MAT02 with some small changes to the circuit as was documented in the KGSS article on Headwize.
The MAT02 is, AFAIK, not available anywhere. I'll take a look for the 2SK170s, though.

EDIT:

I found these on eBay. I figure I can clamp them together with some Arctic Silver to get proper thermal matching. Should I go for them?
http://cgi.ebay.com/4-X-MATCHED-2SK1...item518bff4654
Reply
post #7 of 15
10/21/09 at 12:20pm
Been there, done that:

Group Buy: Linear Systems LSK389 / LSK170 JFETs (i.e. Toshiba 2sk389/2sk170 subs) - diyAudio
Reply
post #8 of 15
10/21/09 at 12:24pm
Quote:
Originally Posted by nattonrice View Post
You still have the problem of it only being SOIC-8 or thru-hole TO-71...
you say problem, I say opportunity

http://tinyurl.com/6zvny2

http://tinyurl.com/5ot3rp
Reply
post #9 of 15
10/21/09 at 12:48pm
Gentlemen, The LSK389 are available like the post said. Just call Linear Systems. I built my P2P KGSS 6 months ago and they work great. The guy at Linear Systems (can't remember his name) is great to deal with and very helpful. If I remember right, a pair of LSK's with shipping is under $20 bucks. A little expensive for some, but the KGSS is worth it and sounds great with my ESP950's. My total cost including xfrm and PC boards from Mouser was around $400, not including any casing. If anyone is interested in building one P2P, PM me and I can give some great tips on building one including power supply tips, parts etc.
Tommy
Reply
post #10 of 15
10/21/09 at 1:10pm
Quote:
Originally Posted by Spasticteapot View Post
II found these on eBay. I figure I can clamp them together with some Arctic Silver to get proper thermal matching. Should I go for them?
4 X MATCHED 2SK170 2SK170BL FOR AUDIO N CHANNEL JFET! - eBay (item 350241113684 end time Nov-15-09 01:46:24 PST)
Even cheaper: Toshiba 2SK170BL for sales - Page 29 - diyAudio

edit: no affiliation with the seller, beside being an happy customer
Reply
post #11 of 15
10/21/09 at 1:42pm
Quote:
Originally Posted by 00940 View Post
Even cheaper: Toshiba 2SK170BL for sales - Page 29 - diyAudio

edit: no affiliation with the seller, beside being an happy customer
if you suggest going that route, then these two "unpopular" threads are worth posting:

JFet matching and measured distortion - Part1 - diyAudio

JFet matching and measured distortion - Part 2: LTP - diyAudio
Reply
post #12 of 15
10/21/09 at 2:18pm
As far as I know DJ Gardner is still selling matched pairs of the 2SK170BL for the dynalo, I see no reason why you can't buy them for the KGSS:

http://www.djgardner.com/headphone/gilmore/
Reply
post #13 of 15
10/21/09 at 3:55pm
Is matching the input fets a matter of sound quality/distortion or only offset ? I went totaly unmatched 2sk170 and 2sj89 with my dynalo.
Reply
post #14 of 15
10/21/09 at 4:16pm
See the two threads I posted above
Reply
post #15 of 15
10/21/09 at 7:00pm
Quote:
Originally Posted by luvdunhill View Post
you say problem, I say opportunity
Hehe I was leaving out that part just in-case a certain someone got inundated with "can I purchase ... ?" requests
Reply
New Posts  All Forums:Forum Nav:
  Return Home
Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › LSK389 - the KGSS is buildable again!