Hi,
these Transistor-pair was quite popular in a number of so called HighEnd amps in the late 80s early 90s.
Burmester used them (think it was the 911 or earlier model), Cambridge used them in their A3i, Accuphase used similar Sanken Ring-Emitter-types (LAPT) already in their M100 up till today and Parasound used also similar LAPTs (SA1295-/SC3264, HCA3500, SA1294/SC3263, HCA2200).
Those are still some of the finest and powerful output transistors and the SA1216/SC2922 are astonishingly cheap -though the very cheap ones could well be by ISC (Inchange Semicon).
Schematics using the SA1216/SC2922:
The schematic in #8 is similar to the Elektor 200W amp.
My Pro-2 EA1000 amp uses them.
jauu
Calvin