Sheffield discs were high quality, however you had men like Doug Sax, men who knew what they were doing, making them. Umbrella (Audio Technica) discs were sonic knock-outs. On the other hand, some DtD didn't sound any better than the usual thing. The problem with DtD was that it was difficult to pull everything together, and easy to screw up (the recording/cutting process happened simultaneously).
Generally, program material was second or third rate, and timing (that is, minutes of program) was few. Sort of like the old restaurant joke: the food here is terrible and the portions are so small. The most egregious I owned (it was a gift) was a Dave Brubeck record. Dave was in a space suit (or something) and the band was his kids. You know going in that any Brubeck performance, especially one with his kids, is not going to be aesthetically proper music. Everyone played acoustic, except a son on electric bass. Electric bass on an acoustic jazz record? You heard right. What the hell were they thinking? The cover was pretty cool. Featuring Stanton Magnetics' (another Gibson 'success' story, /sarc) dual tipped stamper needle in the background. In fact, the album cover was the best part of the package.
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I do own that Dave Brubeck one. Yes, it was often said that the content of DtDs were not good, and they where short. Being short is easily explained: Without a pre-cue system in place the groove distance had to be fixed and wide.
For content: Not many musicians liked playing 15 minutes without break and no chance to cut. I believe the ones that did DtD were brave and deserve credit just for that. Dave Brubeck toured the world during those times with his kids - let us not go into reasons. So his recording is not the DtD’s problem.
There were great big band DtDs from Woody Herman and Budy Rich and Louis Bellson and then of course Harry James. The argument was, that Big Band are used to play live a lot hence DtD was a piece of cake for them - that seemed to be true. But I I agree that some of the smaller no-name groups were more recorded for sound-checks, like Drum or Bass only DtD. But then again there was Phil Woods and LA4 and....
It would be interesting to see if there is a DtD and a Cd release of a parallel digital recording. The said Harry James DtD has been released on CD, but sounds not as good, I guess it was cut from the tape that run in parallel. A release on Sacd or DVD-A would be interesting.