To [@oldhvymech], Interesting. Not sure where this photo came from, I went to a PAP listening session years back and heard these same units. It was an evaluator rep here in NorCal, he had the same hard floors and drapes to the side :) The speakers were overly sensitive for my ears paired with what I felt were the wrong amplifiers for the speakers. Some lower power mono tube amps with good tubes, would have been better for demos imo. It gave some ideas at least.
I too wondered what happened with their production, frames, was sorta looking to test the AMT version, and did not get the chance. Was a clever idea with modular sections. You’ve probably seen these too, this is what I was looking over, great heil at center.