Supersymmetry and single gain stage

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Here is a pic.
 

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> follower type, which can´t be Xed
OK, so I'll forget about that.

> the rail voltage is in my oppinion too low
What would be more appropriate? I find this drives my amp just fine, and can drive many headphones directly.
By the way, would this circuit benefit from adding feedback?
 
Mosfets coupled in common source, like in BOSOZ, needs high voltage (+- 30 to 60v) and high current (>25 mA) to keep reasonable linearity. I don´t kow if this is the case for JWB´s setup.
You can´t make negative feedback on a follower stage, because it´s noninverted.
 
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