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Old 26th March 2018, 08:13 PM   #11
juma is offline juma  Serbia
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Quote:
Originally Posted by wdecho View Post
.... I do not understand why someone has not designed a board for this schematic....
There is one in first post of this thread:
LSK pre - BAF 2013
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Old 26th March 2018, 08:28 PM   #12
wdecho is offline wdecho  United States
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Quote:
Originally Posted by juma View Post
There is one in first post of this thread:
LSK pre - BAF 2013
I built your version of this design as well and it performs to my ears admirable as well.
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Old 26th March 2018, 08:37 PM   #13
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by Nelson Pass View Post
That sounds right.
Thanks Mr. Pass.
Characteristics looks yummy: low noise and distortion, no feedback loop, excellent frequency wide band response etc.
LS jfet's line stage (PCBs + jfets) if available in DiyAudio Store can be new popular 2018 Top five best seller DIY kit.
Superb line stage alternative choice to match with Aficionados amplifiers
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Old 26th March 2018, 08:41 PM   #14
juma is offline juma  Serbia
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Originally Posted by wdecho View Post
I built your version of this design as well and it performs to my ears admirable as well.
My version is in post #66.
Post #1 has PCB for MR Pass' version with few values changed for different Idss grade JFETs and some housekeeping parts added.
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Old 27th March 2018, 02:44 PM   #15
Adams_Leo is offline Adams_Leo  China
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Originally Posted by Nelson Pass View Post
This was presented at BAF four years ago, and I thought I had written
it up, but if I did I can't find it.

Here's the graphics of a nice line level gain stage which has no loop feedback.

Dear Mr, Pass,can I use the 2SK389V/2SJ109V to replace the LSK170C/LSK74V?

Thanks
Leo
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Old 27th March 2018, 03:16 PM   #16
vdi_nenna is offline vdi_nenna  United States
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Preamp with LS Jfets
LSK pre - BAF 2013


LSK Line Stage Original Schematic BAF 2013
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Old 27th March 2018, 05:21 PM   #17
Nelson Pass is offline Nelson Pass  United States
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Quote:
Originally Posted by Adams_Leo View Post
can I use the 2SK389V/2SJ109V to replace the LSK170C/LSK74V?
I think so. Worst case would be adjustment of some resistor values.
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Old 28th March 2018, 02:51 PM   #18
kasey197 is offline kasey197
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Preamp with LS Jfets
Is there an article that explains how the preamp works and what the parts do ?
Or perhaps this is an opportunity for a (very) mini tutorial Nelson ?
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Old 28th March 2018, 02:59 PM   #19
Zen Mod is offline Zen Mod  Serbia
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Preamp with LS Jfets
second stage - think of emiter/source cascode
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Old 28th March 2018, 03:50 PM   #20
vdi_nenna is offline vdi_nenna  United States
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Quote:
Originally Posted by kasey197 View Post
Is there an article that explains how the preamp works and what the parts do ?
Or perhaps this is an opportunity for a (very) mini tutorial Nelson ?
There's a you tube video.

YouTube
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