https://www.eetimes.com/audio-amplifier-topology-with-push-pull-transimpedance-stage-part-3-experimental-verification/


When browsing through old DIY articles, I found one interesting topology,
that seems was never built, at least not on this forum.
Here is a link to EETimes article "Samuel Groner New Topology",
unfortunately, only part 3 is readable (earlier parts come up with no images),
but neverltheless this is the most important part that shows actual schematic of a (headphones ?) pre-amp.
Not sure if this material is copyrighted or not, so I'm not attaching it here.
I think Groner's article was also published in "Linear Audio".

This Groner topology can deliver very high slew rates, and very low Thd.
I tried to incorporate this design into a power amp, and to simplify the task, I used op-amp in the input stage,
instead of LTP with current mirror (as in the original design).
Also, increasing current from 1mA to 2mA in the next stage (Q11/Q12) seems to improve stability.
Sim results look good, but one thing that needs improvement for sure, is clipping behavior.
Any suggestions how to do that?