JFET input, MOSFET VAS, LATERAL output = Perfect!!

[AKSA]

Arbitrary, hey, a bit like the way people choose to think!

Ain't life grand?

Hugh

[MiiB]

to me liberal is open minded....free.. to others liberalism is something different...one must be very careful in communication...

Apart form that...this thread is surely very very good...a lot different than the best spec. threads around...so many good points, so many good reasons for the steps this little circuit goes through..all is done for a reason..to minimize compromises, to maximize performance and simplicity..I like...!!

[mikelm]

Originally Posted by AKSA

But, Mike, the slightly increased Zout for bass frequencies makes the bass that little bit loose, which actually enhances the subjective enjoyment, at least, in my experience.....
Hugh

Your talking to a guy who is happy with a 0.1 or even 0.22 res on the o/p of his amps, so I know where your coming from on this.

[MiiB]

Mike.. but that resistor is inside the feedback loop...so it don't affect the damping very much...

[mikelm]

Oh no, check my cct, I have 3 x 0.1 there. 2 source degenerators inside the loop, 1 outside the loop

[AKSA]

Ah, the ol' 3 x 0.1R resistors on the output trick - in the immortal words of Maxwell Smart.....

There are moments when I think high end audio is like food - an abundance of recipes, and many diverse tastes.

Hugh

[lineup]

Originally Posted by MiiB

this thread is surely very very good
...a lot different than the best spec. threads around
...so many good points, so many good reasons for the steps this little circuit goes through
..all is done for a reason..to minimize compromises, to maximize performance and simplicity
..I like...!!

MiiB
You sum it up good.
There is not one amplifier Fetzilla.
Each contributor has at least 3 suggestions or way to build.
To be open for different ways to make.
I guess it will never end.

Myself, I am open for any request.
The latest was a Fetzilla with IRFP240/9240 outputs.
So I made and published such a version: JFET input, MOSFET VAS, LATERAL output = Perfect!!
Most any way to build Fetzilla is interesting.
New issues and new solutions.

There are clever boys reading.
I love when they jump in with a new idea.
The only thing is to keep Fetzilla fairly simple.
This will attract the constructors the most.

[lineup]

AKSA
Thanks for your schematic of a simple 4 devices amp.
It will not be Fetzilla. But close it is.
Fetzilla uses JFET input.

IT is close to JLH idea.
I will try to investigate your circuit in SPICE.
Thanks

[AKSA]

Hey Lineup,

This IS a JLH design, not sure when, but somewhere in the seventies I believe.

There is nothing new under the sun...... live long enough, you see it all.

But then, you've seen it all too, haven't you?

Cheers,

Hugh

[lineup]

AKSA
Compare your circuit with this JLH Clone in Class A
that I put together some weeks ago: