Semisouth JFET's: What are they good for? - Page 3

carpenter · 7th October 2009, 02:59 PM

I found the thread and request 4 pcs. I don't have time to read the entire thread this morning, but will tonight after work.

This looks like fun!

Diomedian · 7th October 2009, 03:01 PM

Might the Semisouth Jfet be a worthwhile upgrade in the Zen V4? Q1 and possibly Q2?

Nelson Pass · 7th October 2009, 06:07 PM

Yes. I think you can shoehorn it into any place you would
use an N channel power Mosfet, and I expect (but don't
guarantee) lower distortion for every case.

ra7 · 7th October 2009, 06:13 PM

Mr. Pass, lower distortion aside, do they have their own signature sound? I don't know if such a thing even exists for other gain devices.

Nelson Pass · 7th October 2009, 11:22 PM

In simple circuits, I think low distortion has its own signature,
probably by virtue of comparison with other simple circuits
that have higher distortion.

I think it sounds like a fine amplifier, but more relaxed than
your average solid state.

mos57 · 8th October 2009, 06:20 PM

Due to only N devices avaible today, my first application is in a circlotron topology with gain.

Other good usage for me is in circuit as F xx or as Zen xx together Vfets, but in this moment i have some doubt about which devices to use as main voltage amplifier and which to use as CCS.

Francesco

Nelson Bass · 8th October 2009, 08:44 PM

Quote:

Originally Posted by Tea-Bag

Nelson's J2 circuit has elements of the Aleph-J and BA-1 from what I see.
Can't be too wrong to start somewhere around their. will ask cviller at BA-3 what's going on with those front end boards.

Yes, some iteration of the BA-1 would be great as I prefer balanced signal path most of the way to the speakers...

Maybe a circlotron output to try that with FETs 'cause it can sound awesome with tubes (check Atma-sphere).

Nelson Pass · 9th October 2009, 06:59 PM

http://www.businesswire.com/portal/s...62&newsLang=en

Blues · 9th October 2009, 09:11 PM

Zen Mod · 9th October 2009, 09:35 PM

Quote:

Originally Posted by Nelson Pass

http://www.businesswire.com/portal/s...62&newsLang=en

I just wrote e-mail to them ,saying that Papa allowed my asking for free samples,50 pcs .

shipping costs on them , off course .......

now I'll investigate where da vacuum is placed in that critters ......

7th October 2009, 02:59 PM	#21
carpenter Paper mache horn fabricator diyAudio Member Join Date: Mar 2002 Location: Oregon City, Oregon	I found the thread and request 4 pcs. I don't have time to read the entire thread this morning, but will tonight after work. This looks like fun! __________________ I enjoy audio so much that I constructed a web site. I share my ideas at: www.inlowsound.com

9th October 2009, 09:11 PM	#29
Blues Lightning In A Bottle diyAudio Member Join Date: Sep 2003 Location: Bremerton, WA	__________________ Quad Matched Toshiba 2SK1530/2SJ201 MOSFETs http://www.diyaudio.com/forums/swap-...ml#post2086375

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7th October 2009, 03:01 PM	#22
Diomedian diyAudio Member Join Date: Nov 2004 Location: Halifax, N.S.	Might the Semisouth Jfet be a worthwhile upgrade in the Zen V4? Q1 and possibly Q2?

7th October 2009, 06:07 PM	#23
Nelson Pass The one and only Join Date: Mar 2001	Yes. I think you can shoehorn it into any place you would use an N channel power Mosfet, and I expect (but don't guarantee) lower distortion for every case.

7th October 2009, 06:13 PM	#24
ra7 diyAudio Member Join Date: Feb 2009 Blog Entries: 1	Mr. Pass, lower distortion aside, do they have their own signature sound? I don't know if such a thing even exists for other gain devices.

7th October 2009, 11:22 PM	#25
Nelson Pass The one and only Join Date: Mar 2001	In simple circuits, I think low distortion has its own signature, probably by virtue of comparison with other simple circuits that have higher distortion. I think it sounds like a fine amplifier, but more relaxed than your average solid state.

8th October 2009, 06:20 PM	#26
mos57 diyAudio Member Join Date: Apr 2006 Location: Catanzaro - Calabria	Due to only N devices avaible today, my first application is in a circlotron topology with gain. Other good usage for me is in circuit as F xx or as Zen xx together Vfets, but in this moment i have some doubt about which devices to use as main voltage amplifier and which to use as CCS. Francesco

9th October 2009, 06:59 PM	#28
Nelson Pass The one and only Join Date: Mar 2001	http://www.businesswire.com/portal/s...62&newsLang=en

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