FirstWatt J2 - Page 2

calvert73 · 20th September 2009, 04:51 PM

Count me on on a healthy number! This could be a one off deal so I think this GB will be well subscribed.

RC

zhoufang · 20th September 2009, 05:16 PM

Will a J2 made with LU1014D have similiar performance?
Does LU1014D have any other disadvantage (higher distortion), other than having a low 24V voltage tolerance.
We can run the LU1014D at +/-12V.
Assuming the output goes to +/-10V, with balance amp we can get:
50W into 4ohm
25W into 8ohm
That should be more than sufficient for a non-mono-block class A for many of use.

Magura · 20th September 2009, 05:19 PM

Quote:

Originally Posted by zhoufang

Will a J2 made with LU1014D have similiar performance?
Does LU1014D have any other disadvantage (higher distortion), other than having a low 24V voltage tolerance.
We can run the LU1014D at +/-12V.
Assuming the output goes to +/-10V, with balance amp we can get:
50W into 4ohm
25W into 8ohm
That should be more than sufficient for a non-mono-block class A for many of use.

Been there myself.

You run into the wattage limitation of the LU.

Magura

masag1 · 20th September 2009, 05:25 PM

yes thats good news. Count on me too for the GB.

With kind regards

Sam

zhoufang · 20th September 2009, 05:31 PM

Quote:

Originally Posted by Magura

Been there myself.

You run into the wattage limitation of the LU.

Magura

What if we place 3-6 device in parallel in place of each Si-C Jfet?
That should be able to reduce the heat from each device to below 10w

Magura · 20th September 2009, 05:41 PM

Quote:

Originally Posted by zhoufang

What if we place 3-6 device in parallel in place of each Si-C Jfet?
That should be able to reduce the heat from each device to below 10w

I tried that, but they are not sharing well. I have a test setup where this was supposed to bring some fun.
No fun so far, just blown devices.

Magura

Nelson Pass · 20th September 2009, 05:41 PM

Quote:

Originally Posted by Magura

How do we get our hands on a few of those Semisouth JFET's

You get in line behind me.

Magura · 20th September 2009, 05:42 PM

Quote:

Originally Posted by Nelson Pass

You get in line behind me.

Depends how much threats and crying you've displayed

Magura

Tea-Bag · 20th September 2009, 05:45 PM

ya think the likes of Mouser and Digi-Key will carry these soon enough?

I dont see why not.

The real question is, will Nelson reveal a DIY version of this beast in short or long haul.

Nelson Pass · 20th September 2009, 05:56 PM

I've been clear on this - the schematics of the J2 will be
released when production ceases. I'm tired of the
commercial clones using my trademarks, claiming to be
accurate reproductions.

In the meantime, you should have enough smarts to cobble
together your own versions based on the simplified
schematics. Much more fun that way.

20th September 2009, 04:51 PM	#11
calvert73 diyAudio Member Join Date: Aug 2005	Me too! Count me on on a healthy number! This could be a one off deal so I think this GB will be well subscribed. RC

20th September 2009, 05:16 PM	#12
zhoufang diyAudio Member Join Date: Nov 2008	balanced J2 with LU1014D? Will a J2 made with LU1014D have similiar performance? Does LU1014D have any other disadvantage (higher distortion), other than having a low 24V voltage tolerance. We can run the LU1014D at +/-12V. Assuming the output goes to +/-10V, with balance amp we can get: 50W into 4ohm 25W into 8ohm That should be more than sufficient for a non-mono-block class A for many of use.

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20th September 2009, 05:25 PM	#14
masag1 diyAudio Member Join Date: Dec 2008	yes thats good news. Count on me too for the GB. With kind regards Sam

20th September 2009, 05:45 PM	#19
Tea-Bag not politcally affiliated diyAudio Member Join Date: Feb 2006 Location: Kennebunk Blog Entries: 7	ya think the likes of Mouser and Digi-Key will carry these soon enough? I dont see why not. The real question is, will Nelson reveal a DIY version of this beast in short or long haul.

20th September 2009, 05:56 PM	#20
Nelson Pass The one and only Join Date: Mar 2001	I've been clear on this - the schematics of the J2 will be released when production ceases. I'm tired of the commercial clones using my trademarks, claiming to be accurate reproductions. In the meantime, you should have enough smarts to cobble together your own versions based on the simplified schematics. Much more fun that way.