This seems an interesting idea - running a tube amp and a solid state amp in parallel to allow selectable impedance.
https://www.tubecad.com/2021/02/blog0528.htm
Using that idea, Broskie is supporting 32 to 600R.
https://www.tubecad.com/2021/02/blog0528.htm
Using that idea, Broskie is supporting 32 to 600R.