I also have a TNT-200, but the direct drive servo amps are what I use on my Model 2 speakers. While Roy Esposito in FL could refurbish a set, these guys in the Netherlands offer a modified version of the original, as well as their own model: https://twinstaticaudio.com/electronica/twin-otl/.
Those Acoustats drop to 2 ohms or less in the high treble. You should stick to using the TNT amp. I have one - an excellent amp!
My Quad ESL 57s also go down to below 2 ohms in the treble, in fact the impedance curve is very similar to the Model 2. I’m using the new Atma-Shere Class D amplifier which is GaN based and the amp has no issues driving my Quads. Atma-Sphere offers a trial period so you have an opportunity to try the amps out at no risk.