Beast with a Thousand JFETs

[jan.didden]

Originally Posted by zhoufang

Does it read 0.0024% THD at 1W without any NFB?

Not only that, it also reads 0.02% at 20W if my eyes don't desert me. This is examplary performance with no fb. I don't know how Nelson comes up with these schemes, but he picks winner after winner. My virtual hat goes off for him.

jd

[oliverniekamp]

This thing is realy fascinating for me.
But there shurely is a huge problem, how can i build this by myself?

Mr. Pass you realy know what patience and endurance are, do you?

[Nelson Pass]

It's the parts.

So far I only have the one, as it takes about 12 hours
to stuff it up, and I have 3 more to go.

Of course I still have to build a front end for it, so we'll see
what the final result might be.

If you want to think really tweaky, here's the 8 ohm
curve on a pair of car batteries:

[Spooky Electric]

[zhoufang]

As a follow DIYer, I'll be more interested if it will be a similiar project using thousands of N-jfet in single-ended setup.
Even if it take twice the number of Jfets to get the same output power and the THD is slightly higher.
Of course N-jfet has much lower capacitance, so for a set amount of output power, SE setup might actually have lower capacitance load for the front-end.

Unless the LSJ74 is released, then it will be a different story.

[Rembulan]

Originally Posted by zhoufang

As a follow DIYer, I'll be more interested if it will be a similiar project using thousands of N-jfet in single-ended setup.
Even if it take twice the number of Jfets to get the same output power and the THD is slightly higher.
Of course N-jfet has much lower capacitance, so for a set amount of output power, SE setup might actually have lower capacitance load for the front-end.

Unless the LSJ74 is released, then it will be a different story.

I need 3 weeks to find 2 pcs sj74 in my local (indonesia) market, N Jfet is far far easier

[flg]

Originally Posted by Nelson Pass

It's the parts.

So far I only have the one, as it takes about 12 hours
to stuff it up, and I have 3 more to go.

Of course I still have to build a front end for it, so we'll see
what the final result might be.

If you want to think really tweaky, here's the 8 ohm
curve on a pair of car batteries:

Ohh, starting to sound like my paralell LU1014s in B1 configuration... Like Mosnter B1??? But as John Curl might like to read, lower Rg!!!

[slam]

Papa are we going to see this in BA09? It would be a big attraction.

I start to see a big jfet group by now... 1000 pcs per person, and we will get a better rate if we reach a 100K lot

[Nelson Pass]

Originally Posted by slam

Papa are we going to see this in BA09?

I don't know. Maybe.

[Nelson Pass]

BTW, I have a batch of Sony 2SK82 and 2SJ28's coming in.

Does anyone know the pinouts on them?