[Projectiboga]

Late 80s or early 90s there was also a DAD type, which often sounded really good.

From that Wiki link-

In practice, DAD was very rare, as many companies (especially the well-known classical music labels) used digital tape recorders (which were not prohibitively more expensive than analog tape recorders) during the editing or mixing stage.

[WillAdams]

I don't know if I have such a CD --- do you have an example which is noted as sound markedly better than other editions? (I'd especially be interested in a DAD disc which sounds better than an updated DDD disc)