Audio Innovations Valve amps

Hi folks - does anyone know anything about "Audio Innovations" old valve amps from the late 80's and 90's? They had a perspex acrylic top and the valves sat behind. I think they were the 500 and 700 series, but I'm not sure. Are they a possible good used buy for a first dalliance with glowing tubes? Any experiences would be welcome!

Dip in and out HERE