FirstWatt J2 - Page 58

audiodesign · 14th January 2011, 06:20 PM

yes, the FirstWatt J2 use a CCS on output stage to fix the current also when temperature increase.

Zen Mod · 14th January 2011, 06:24 PM

nope

Tazzz · 14th January 2011, 06:33 PM

Here is all one need to know about the output stage topology used in the J2 in order to make a clone that's close enough to contain the interesting characteristics!

The Good Old Days & More SRPP

(Scroll down to "Even More Impedance-Multiplier Circuitry")

flg · 14th January 2011, 06:46 PM

Quote:

Originally Posted by Zen Mod

let's say just that Mighty ZM measured that

not thoroughly with CCS biasing , but with plain power resistor between PSU and drain

gate was tied to drain , of course

in any case - let them bleed ......... and do not worry too much

Very good ZM! Time to get back to the Circlotron circuit. With JFETs this time...

bobodioulasso · 14th January 2011, 06:58 PM

Looks like J2 thread is awaking

Zen Mod · 14th January 2011, 07:42 PM

not with me , Bubba

Tazzz · 09:39 PM

My J2 clone is done and dusted

bobodioulasso · 14th January 2011, 09:50 PM

I still need to buy some Sic Jfets first.
Nah, to many amps there.

Need to sell some.

nicoch58 · 15th January 2011, 09:10 AM

bobodioulasso you can gift one to me

bobodioulasso · 15th January 2011, 09:16 PM

Do you want speakers also?

14th January 2011, 06:24 PM	#572
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	nope __________________ 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

14th January 2011, 07:42 PM	#576
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	not with me , Bubba __________________ 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

14th January 2011, 09:22 PM	#577
Tazzz diyAudio Member Join Date: Jun 2007	My J2 clone is done and dusted Last edited by Tazzz; 14th January 2011 at 09:39 PM.

15th January 2011, 09:10 AM	#579
nicoch58 diyAudio Member Join Date: Oct 2004	bobodioulasso you can gift one to me __________________ Sic58

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14th January 2011, 06:20 PM	#571
audiodesign diyAudio Member Join Date: Sep 2005	yes, the FirstWatt J2 use a CCS on output stage to fix the current also when temperature increase.

14th January 2011, 06:33 PM	#573
Tazzz diyAudio Member Join Date: Jun 2007	Here is all one need to know about the output stage topology used in the J2 in order to make a clone that's close enough to contain the interesting characteristics! The Good Old Days & More SRPP (Scroll down to "Even More Impedance-Multiplier Circuitry")

14th January 2011, 06:58 PM	#575
bobodioulasso diyAudio Member Join Date: May 2008	Looks like J2 thread is awaking

14th January 2011, 09:50 PM	#578
bobodioulasso diyAudio Member Join Date: May 2008	I still need to buy some Sic Jfets first. Nah, to many amps there. Need to sell some.

15th January 2011, 09:16 PM	#580
bobodioulasso diyAudio Member Join Date: May 2008	Do you want speakers also?

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