Tom, Thanks for the clarification. I am pretty sure mine are numbered 4332/4333 but like I said the numbers are rubbed and it is a bit of a guess. Based on the above, info they may have been some of the last made, so definitely would not have the lex boards. Guess I now have a future project on my to do list. Glad to hear the 2.4 was definitely a winner both in sales and, for me, sound enjoyment.
bettlemania, thank you for the info on accessing to xo. I will start trying to track down the parts mentioned in this thread.
Jafant, no I did not have the earlier Cary DMS units but the sound from the 700 via streaming and flac files is truly impressive and musical; on a par with my analogue set up in many recordings.