Got the DIY DAC out and installed a TI(NS) LME49720 dual opamp to replace the AD827 that comes stock in the unit. That was a nice sonic upgrade.
Also have a NS LM4562 and two single Burson discrete opamps to try once I have built an adaptor to connect it to the PC Board. The area around the DAC chip socket is to small to fit the Bursons. These are the generation one back from the present Burson design, so will be interesting. They are supposed to be a direct replacement for the AD827's. Will probably add bypass caps to the extender board, since it now will add a few inches of wire. Want to keep stability with the new change.
More once I get the adaptors built.