@joecollege
Very cool! Sold mine back then too. Heck, I might have even built yours - who knows. I worked at ESS, on the AMT line back then. You can find some used ones too, recondition them. New surrounds, diaphragms in the Heils, some cabinet refinishing and there you go! Heils are going cheap, add your own woofer and 2-way crossover and cabinet too. Listened to a lot of Van Halen, Zeppelin, AC/DC and all back then on the AMTs. Build my own custom ones now with parts. Sound truly amazing with good tube amps - lead guitars in particular!
Enjoy listening, lots of Eddie playing right now I bet!