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Old 27th September 2009, 02:24 AM   #101
Ipanema is offline Ipanema  Malaysia
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Can we use this circuit for J2 output stage? http://www.tubecad.com/2009/09/blog0172.htm Pls scroll to Zen Meets the Impedance-Multiplier Circuit
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Old 27th September 2009, 02:36 AM   #102
Nelson Pass is offline Nelson Pass  United States
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FirstWatt J2
Quote:
Originally Posted by Blues View Post
Mr. Pass, any more teasers on the new PL INT-30A...?
Not much to tease. An XA30.5 with an integrated input
system like the INT150.

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Old 27th September 2009, 03:00 AM   #103
Nelson Pass is offline Nelson Pass  United States
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FirstWatt J2
Item 1. Srajan's photo cleverly made you miscount the
number of JFETs.

Item 2. The 6 legged beast will probably have 8 legs next
board iteration.

Item 3. You already have plenty enough information in
the simplified schematic. Go forth and fill in the details
yourselves.



Perhaps you guys are getting a little too excited. It is not
likely that any of these "more tubey" sorts of parts are
the Holy Grail.

I see them as more of an potential opportunity to get good
sound out of very simple circuits. I certainly am not
trying to emulate tube circuits.

Perhaps I better not mention the two other new depletion
mode parts I got....

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Old 27th September 2009, 03:07 AM   #104
Nelson Pass is offline Nelson Pass  United States
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Quote:
Originally Posted by Ipanema View Post
Can we use this circuit for J2 output stage? http://www.tubecad.com/2009/09/blog0172.htm Pls scroll to Zen Meets the Impedance-Multiplier Circuit
Both of these would be called "mu followers" if you are going
by Wikipedia's examples, and they would work fine, but they
would be J2 variations.

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Old 27th September 2009, 04:02 AM   #105
Hearinspace is offline Hearinspace  Canada
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Quote:
Originally Posted by Nelson Pass View Post
Perhaps I better not mention the two other new depletion
mode parts I got....
Oh maaaaan
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Old 27th September 2009, 04:54 AM   #106
Melon Head is offline Melon Head  Australia
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Default Quasi-Complementary J2

Thanks Ipanema
I have modded the circuit to make a 2 gainstage J2 push pull circuit (quasi-complementary of course), and it works.
I haven't tried to optimise it yet, and I have used Irfp240 because I don't have models of the SiC JFETS yet.
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Old 27th September 2009, 05:49 AM   #107
Spooky Electric is offline Spooky Electric  Germany
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Quote:
Originally Posted by Nelson Pass View Post
Perhaps you guys are getting a little too excited. It is not
likely that any of these "more tubey" sorts of parts are
the Holy Grail.
For me personally this hobby has always been in a way the search for the Holy Grail. I compare the Grail itself with audio equipment, that allows perfect reproduction of music. I don't care about tubes or sand, snakeoil or science or other controversies. I'm searching for perfect sounding music. But will we ever have? Sure!!! Compared to the sense of hearing of some animals we humans are quite deaf! I think there is hope, that the illusion would be perfect some day - at least for our ears. Until then I have fun to occupy myself with this very special search for the Holy Grail.

Last edited by Spooky Electric; 27th September 2009 at 05:52 AM. Reason: Me fail Englisch...
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Old 27th September 2009, 08:13 AM   #108
Melon Head is offline Melon Head  Australia
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Default J2 with IRFP240 Output

J2 Circuit with irfp240 output.
This simulates very nicely even with the mosfet output stage.
I think I will build it.
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Old 27th September 2009, 08:59 AM   #109
Spooky Electric is offline Spooky Electric  Germany
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Quote:
Originally Posted by Floyd42Flake View Post
I don't care about tubes or sand, snakeoil or science or other controversies.
Sorry for this edit, nightshift was long and I am a bit tired now:
What I meant to say, I have no preference - neither for tubes nor for solid state. Both are highly welcome to enjoy music. Science is also fine. I have a strong predilection for it. But I hate this quarrel about science or snake oil. Rather often snake oil is pure rip-off! However in some cases snake oil is really effective. The lack of scientific explanation makes it suspicious. Then one day, someone finds the explanation and the whole world cheers: "I always said this!"
Improved parts like these SiC jFETs are always welcome. The advantages have been discussed here and at other places. They are new but quite unsuspicious, because their low distortion is measurable and thus pure science! Are they the Holy Grail? No! Is the J2 the Holy Grail? I hope so! (<- Floyd42Flake - cheerful as always! )
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Old 27th September 2009, 09:50 AM   #110
R-K Rønningstad is offline R-K Rønningstad  Norway
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FirstWatt J2
Default 2sk82/j28

StevenOH
Thank you for the post with links!
I attached the two output configurations shown in the AES paper mentioned earlier.
No conclusions at all from me yet

RK
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File Type: jpg sony aes fig2.jpg (28.9 KB, 1541 views)
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