My understanding from Dick Gaughan, who started to remaster some of the Leader/Trailer tapes when he still had a relationship with DB, was that many of the tapes had deteriorated to such an extent, that remastering from a mint record was a better option.

John

PS However, it strikes me that the first four posts were simply a request for info , which was supplied, until DB appologist, "Guest Chris B" turned it into Celtic Music 7.