ADAT is on SVHS (Much higher resolution and dynamic range, than VHS. Comparable to high Beta 8mm)
Later ones are 20bit linear/48kHz.
ADAT machines record in digital but have both analog and digital inputs & outputs, they have both A/D & D/A converters. The best method to transfer is by Toslink(light pipe) connections. Sends digital across fiber optics to computer card for example or DAW/digital mixer, that have Toslink connectors. Or you can just send thru RCA analog outs to analog mixer or recorder. Then master & Burn. Anyone with an ADAT machine, probably has enough equipment to do this. Pretty easy to do. Could also just leave them on a computer in .wav for archiving. You are in Analog forum, so if ya got a mixer and 1/2 track deck, you could just go RCA analog out thru mixer to Deck and have it on RtR.
Wish you were close, I'd just loan ya an LX-20 to do it.
Ask around, someones gotta have one close to ya. Do it yourself and save the bucks.
Good luck
PM me if you want to send them to me, maybe I could do it for you. PM me with more details. I don't use computer, but do have ADAT's, Mixers & Stand-alone Hard disk, & CD-RW Burner, so could burn redbook CD's for ya. You then, could rip them to your computer.