[Caniggia]

this idea is swap input transistor of traditional diamond buffer with jfet
http://www.esafono.it/stee_headphone.png

 

[kevin gilmore]

That probably works but is not a diamond buffer.
You have to flip the positions of the jets and move the current sources
To the bases of the output transistors

 

[kevin gilmore]

actually that schematic has a number of problems.
 
This is what you want.
http://gilmore.chem.northwestern.edu/fetdiamondp.pdf
 
and then you can add a servo around it and drive the current source
to maintain 0 volts dc on the output.
 
performance about .005% thd, and flat to 20khz.

 

[Caniggia]

HELLO KEVIN!
tries to mimic the pattern without current source (no with fet)
and with the bootstrap (the voltage is lowered to 12V)
I think it is better for several reasons