FInally got al the parts of the puzzle to work together. Played back from the 1200B with Merlin mods and the NEC TBC. Sent video to the D-Bridge and then to the AJA convertor. Then captured in Final Cut Pro as DVCPRO 50. Edited and then output as H.264 with deinterlacing at Good quality.  Tapes from various sources. None from transfer clients.