Old post but… I don’t know about availability outside of Japan, but I don’t think there were many made through those years. My father worked for Teac in 67-78, while stationed in Japan in the USAF. He designed the front face of the AS-200 which persisted through the subsequent versions. He was always ticked that he didn’t put the headphone out on the main face instead of behind the control cover.Might have only been available in Japan or might just be a prototype. Not much info out there on older TEA
He had a twin reel to reel and phono system with a tuner, crossover and the AS-200 powering it. It was a big cabinet with tape and record storage below. He dubbed it “the Monolith.” Great memories. All that remains is the AS-200, which I own. He passed way in 2021. Wish he was still around, I could ask about it. Never thought to get details when I was younger.