FirstWatt J2

[Ipanema]

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

[Nelson Pass]

Originally Posted by Blues

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.

[Nelson Pass]

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....

[Nelson Pass]

Originally Posted by Ipanema

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.

[Hearinspace]

Originally Posted by Nelson Pass

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

Oh maaaaan

[Melon Head]

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.

[Spooky Electric]

Originally Posted by Nelson Pass

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.

[Melon Head]

J2 Circuit with irfp240 output.
This simulates very nicely even with the mosfet output stage.
I think I will build it.

[Spooky Electric]

Originally Posted by Floyd42Flake

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! )

[R-K Rønningstad]

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