Arthur, I found something a little odd. My info from about a year ago specifies a Philips UDA1351 DAC, but.... according to the latest data from Jolida it is now a Burr-Brown PCM1706. Go figure. I'll be opening mine next week (tube roll) so I'll take a look.
The 1716 is 28 pin and the 1704 is 20, so I'd figure no swapping without adding a socket or board modifications.
I digress, my opinion is the associated electronics play a bigger role than the DAC itself. Subjectively speaking of course. I find the Jolida, especially with tube tweaking, to be an excellent performer considering its price. I havent had the 308T in my system but I bet its no slouch. Cary makes fine products.