Pass SE amps with 'active current source'?

Hi Pass aficionados, I am searching for Pass amp circuits, single ended, that use a split resistor in the current setting of a current source load to double the class A output current. Needed as reference for an article.
I believe Nelson called them active current source or modulated current source, although the latter is also from one of his patents which has a different topology than the one I an looking for.

Ring any bells?

Jan
 
original Aleph patent enclosed

I don't know of any specifiic article from Pa, about Pa's Mu Follower circuit

now, most comprehensive presentation with Mu Follower certainly being BAF 2015 video, big amp with 2SK77B or Schaded IXYS puck

other examples - J2, F8, can't exactly remember details from last BAF's presentation (worth checking)

plenty of breadcrumbs during the years, and I clearly remember that Pa said numerous times that Aleph CCS and Mu follower are effectively pretty similar in result, only that Mu is easier to fine tune

 

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