J-fet Zen Srpp ???

Circlomanen · 6th March 2006, 04:54 PM

I came to think of this today.

Of course cascode moddulation can be implemented. would it work?
As its drawn it has a ultralinear feedback arrangement.

Nelson Pass · 6th March 2006, 06:11 PM

I believe it will work very well. I have a similar schematic which I
have yet to build.

kekso22 · 7th March 2006, 03:51 PM

The circuit should have much more gain then ZEN9?
Do you have modelled it with SPICE?

Regards

Circlomanen · 7th March 2006, 05:12 PM

Thank you Mr Pass! Looking forward to it!

kekso22: I have not spiced it. I dont know how to. I dont know if it has more gain than Zen v9, but its a way to make a simple pushpull circuit.
I just like the SRPP circuit Its simple and elegant.

Circlomanen · 7th March 2006, 05:14 PM

I think R10 should be a constant current source. It should work a lot better with a stable voltage accros R11.

tschrama · 7th March 2006, 05:25 PM

Or a cap around R11

Very cool circuit Circlomanen

Circlomanen · 8th March 2006, 01:23 PM

Quote:

Or a cap around R11

Yes, thats one simple solution. Thanks!

Quote:

Very cool circuit Circlomanen

Im glad you liked it! Thanks one more time!

Johannes.

Circlomanen · 8th March 2006, 02:24 PM

The preamp.

Circlomanen · 8th March 2006, 03:14 PM

I think that R8 and R4 should be 33 ohms or something similar.

massimo · 8th March 2006, 06:00 PM

Some friends of mine years ago tried a Fet based SRPP circuit, using Japanese and European semi such as 2SK and BF type, but they found many problems.
The only "working" Fet/SRPP schematics I'm aware of has been published on the Japanese mag MJ.
The "secret" was the particular hi voltage Vfet used: 2SK79, made by Sony and non longer manufactured).
I understand you circuit is different, but I think it needs to be tested carefully.

6th March 2006, 04:54 PM	#1
Circlomanen diyAudio Member Join Date: Sep 2004 Location: Göteborg	J-fet Zen Srpp ??? I came to think of this today. Of course cascode moddulation can be implemented. would it work? As its drawn it has a ultralinear feedback arrangement. __________________ We live in a horizontal world, why use vertical topologies???

7th March 2006, 05:12 PM	#4
Circlomanen diyAudio Member Join Date: Sep 2004 Location: Göteborg	Thank you Mr Pass! Looking forward to it! kekso22: I have not spiced it. I dont know how to. I dont know if it has more gain than Zen v9, but its a way to make a simple pushpull circuit. I just like the SRPP circuit Its simple and elegant. __________________ We live in a horizontal world, why use vertical topologies???

7th March 2006, 05:14 PM	#5
Circlomanen diyAudio Member Join Date: Sep 2004 Location: Göteborg	I think R10 should be a constant current source. It should work a lot better with a stable voltage accros R11. __________________ We live in a horizontal world, why use vertical topologies???

8th March 2006, 02:24 PM	#8
Circlomanen diyAudio Member Join Date: Sep 2004 Location: Göteborg	The preamp. __________________ We live in a horizontal world, why use vertical topologies???

8th March 2006, 03:14 PM	#9
Circlomanen diyAudio Member Join Date: Sep 2004 Location: Göteborg	I think that R8 and R4 should be 33 ohms or something similar. __________________ We live in a horizontal world, why use vertical topologies???


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6th March 2006, 06:11 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	I believe it will work very well. I have a similar schematic which I have yet to build.

7th March 2006, 03:51 PM	#3
kekso22 diyAudio Member Join Date: Feb 2005 Location: Bavaria	The circuit should have much more gain then ZEN9? Do you have modelled it with SPICE? Regards

7th March 2006, 05:25 PM	#6
tschrama diyAudio Member Join Date: Jul 2001 Location: The Netherlands	Or a cap around R11 Very cool circuit Circlomanen

8th March 2006, 06:00 PM	#10
massimo diyAudio Member Join Date: Dec 2002 Location: Milan, Italy	The preamp Some friends of mine years ago tried a Fet based SRPP circuit, using Japanese and European semi such as 2SK and BF type, but they found many problems. The only "working" Fet/SRPP schematics I'm aware of has been published on the Japanese mag MJ. The "secret" was the particular hi voltage Vfet used: 2SK79, made by Sony and non longer manufactured). I understand you circuit is different, but I think it needs to be tested carefully.

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