Aleph Topology - Power Follower instead Common Source Power output ?

[tiefbassuebertr]

Aleph Topology - Power Follower instead Common Source Power output ?

By chance I have found the schema from the attachement.
The main difference to the Aleph output stage is the fact, that this stage works as power follower like that one about
http://www.audiodesignguide.com/my/Follower_99c.gif
but include the same features than the Aleph output stage concerning the enhancement of the efficiency.

The question is, how I can add a differential input amp to the power follower from the attached jpg file?

If I know this, there is automaticlly the possibility of choice about a select switch, to operate in two modes:
1) output stage as common source
2) output stage as power follower

Who can post the appropriate circuit topology?

About
http://www.diyaudio.com/forums/pass-labs/131053-source-follower-common-source-output-stages.html
and
http://www.diyaudio.com/forums/solid-state/4320-common-source-versus-common-drain-output-stages.html
unfortunately there are no advices about this.

 

[geraldfryjr]

Here are some ideas that I have been working on that might help you. jer

http://www.diyaudio.com/forums/headphones/189984-all-discrete-class-headphone-amp.html#post2596223