I found one of those early digital Telarc LPs, recorded April 4 & 5, 1978, on a Soundstream Digital Recorder. Claims frequency response of 0-21KHz.
TELARC DIGITAL, Stereo 5038
Frederick Fennell, Cleveland Symphony Orchestra
Program of Holst, Handel, and Bach selections.
Liner notes actually list every member of the orchestra and what he/she plays, presumably cause you might be able to hear each one (?)
Actually, the first time I played this on a little Pioneer turntable and receiver combo into a pair of EPI 100s, it was the first time those little speakers made the floor vibrate in the house we lived in then.
Don't play it much anymore; it accidentally got some bad gouges toward the end of side one, my favorite side.
I have a few of that release, a great LP, and plenty of evidence to show that digital in the process can still sound very good with vinyl as the medium.
The technical specific's on that recording was three Schoepps/Studer transformerless Omni microphones, Model SKM-52U. Their signal was fed throught a Studer Model 169 mixing console directly to the Soundstream Digital Recorder. Mastering was accomplished by sending the digital playback signal directly into the electronics of a Neumann VMS-70, SAL-74 cutting system equipped with an SX-74 cutter head. That Neumann System belonged to the JVC Cutting Center in Los Angeles and is completely transformerless, and especially designed for half-speed mastering. Mastering was done half-speed using Pyral Lacquers and Adamant cutting styli. Absolutely no limiting, filtering, compression, equalization or low frequency crossover was used at any point in either the recording or mastering process. Monitoring was done using ADS Model BC-8 Broadcast Monitor loudspeakers.
Frequency Response: Flat from 0 to 21 kHz (-3 at 22kHz)
Total Harmonic Distortion: At "0" Vu, less than .004%
At Peak levels, less than .03%
Signal to Noise: 90 db RMS, Unweighted
Dynamic Range: 90db RMS, Unweighted
Samping Rate: 50,000 samples per second
Digital Fomat: 16 bits linear encoding/decoding
Wow and Flutter: Unmeasurable
That LP includes a warning slip that drops out when you pull the LP out, due to its wide dynamic range they warn you to start out at lower volumes in order to minimize speaker damage on some of the passages.