Article: Beast With a Thousand Jfets - Page 3

Zen Mod · 20th January 2013, 09:08 PM

Quote:

Originally Posted by Nelson Pass

I am happy to announce ......

That's my Pa !

kasey197 · 21st January 2013, 02:35 AM

Nelson cool article !

Just one question --- in the poster attached to your article ... is that the same Morgan Jones from england who writes about valves ?

Perhaps he was on his way up in the "entertainment industry" when he crossed paths with R Corman

Loudthud · 21st January 2013, 02:38 AM

I'm wondering why the dissipation per JFET is so low. The number of JFETs could be cut in half. Is it a distortion sweet spot?

Rob McCance · 21st January 2013, 02:57 AM

He's gone CRAZY!

Amps with two devices...amps with 2,000 devices. Which is it, spits or swallows..

I love it!

Nice work, Pass.

BTW, that's the cleanest distortion waveform I've ever seen. Like something from a textbook where you use only ideal parts.

chalkandtalk · 21st January 2013, 07:43 AM

So to get a similar amp with 5W output only needs 500 ish jfets total. This comes in at under £200 - cheap as chips

Zen Mod · 21st January 2013, 04:26 PM

all Dodos are chickened

(Mighty ZM preparing Babelfish Beast)

flg · 21st January 2013, 04:54 PM

Quote:

Originally Posted by Zen Mod

That's my Pa !

What Da Ya Mean? Papa finally adopted ZM

!!!

dimkasta · 21st January 2013, 05:26 PM

Quote:

Originally Posted by chalkandtalk

So to get a similar amp with 5W output only needs 500 ish jfets total. This comes in at under £200 - cheap as chips

We could also use a transformer before one of the driving cell to reverse its phase so that we could use only 2sk170s a'la F6

flg · 21st January 2013, 05:44 PM

The buffer for the xfrmr will benifit from the comp buffer driving it. Still gonna need some P's! But that bXfrmr should drive many cells!

portreathbeach · 21st January 2013, 08:48 PM

This looks like a crazy build. Would love to make something similar.

I have a few questions.

Would this work with an unbalanced source?
Is there just 1 single 1K resistor feeding all of the JFETs, or does each cell have one each?
Are there alternative JFETs that could be used which are cheaper and more available?

21st January 2013, 04:26 PM	#26
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	all Dodos are chickened (Mighty ZM preparing Babelfish Beast) __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

21st January 2013, 05:44 PM	#29
flg diyAudio Member Join Date: Jul 2005 Location: North East	The buffer for the xfrmr will benifit from the comp buffer driving it. Still gonna need some P's! But that bXfrmr should drive many cells! __________________ “Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” Dr. Seuss

21st January 2013, 08:48 PM	#30
portreathbeach diyAudio Member Join Date: Jan 2010 Location: Cornwall	This looks like a crazy build. Would love to make something similar. I have a few questions. Would this work with an unbalanced source? Is there just 1 single 1K resistor feeding all of the JFETs, or does each cell have one each? Are there alternative JFETs that could be used which are cheaper and more available? __________________ Another project of mine: (a very big one at that!) http://www.mp3car.com/vbulletin/show...5-pimping.html

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21st January 2013, 02:35 AM	#22
kasey197 The Dastardly Dad of Three diyAudio Member Join Date: Sep 2009	Nelson cool article ! Just one question --- in the poster attached to your article ... is that the same Morgan Jones from england who writes about valves ? Perhaps he was on his way up in the "entertainment industry" when he crossed paths with R Corman

21st January 2013, 02:38 AM	#23
Loudthud diyAudio Member Join Date: Nov 2007 Location: Near Dallas Texas USA	I'm wondering why the dissipation per JFET is so low. The number of JFETs could be cut in half. Is it a distortion sweet spot?

21st January 2013, 02:57 AM	#24
Rob McCance diyAudio Member Join Date: Dec 2011	He's gone CRAZY! Amps with two devices...amps with 2,000 devices. Which is it, spits or swallows.. I love it! Nice work, Pass. BTW, that's the cleanest distortion waveform I've ever seen. Like something from a textbook where you use only ideal parts.

21st January 2013, 07:43 AM	#25
chalkandtalk diyAudio Member Join Date: Jan 2006 Location: North west England	So to get a similar amp with 5W output only needs 500 ish jfets total. This comes in at under £200 - cheap as chips

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