Please Recommend Highly Efficient Floor Standing Non-Horn Speaker Suggestions

Many hi efficiency non horn speakers are single driver speakers like Omega or Lowthers or back loaded horn cabinets.  I’ve been in this hobby 40 years and used to sell audio gear at the retail level & wouldn’t necessarily suggest high efficiency speakers with a Mac 275 amp.  I certainly would with a low powered SET amp though.

So far is seems that you have a contemporary 75 watt MC275 VI tube amp with no mention of room size/layout/listening habits/budget.

More info would be helpful for informed feedback.

Also, are you not interested in horn "based" speakers at all?

DeKay

@OP

You may consider , speakers with AMT  tweeter.

I think AMT tweeter is a bit like an harmonica.  It may pair well with tube gear

Audiovector has AMT tweeter.

You might like the Wolf von Langa SON. Cutting edge field coil drivers, dipole presentation, happy with 18 watts. Sounds alive.

Here’s a nice review: HFA - Wolf von Langa SON

What, no love for Tekton? ;-)