Another @Chucky Stiletti type question. The spec on the 200s is 60W at 16ohms. Is there any reason that I couldn't play that into my 215m, which is 4ohms? I do have other options at 8ohms (MM 115RH and Trace Elliott 210).
I'm not Chuck but I wouldn't run it at 4 ohms, maybe the cab has two 8 ohm speakers in parallel? If so you could rewire it in series for an impedance of 16 ohms. Some tube amps are ok at half under and doubled but I won't do it. With tube amps I always run them at the correct impedance.