But one thing that stands out, as I have listened to these albums off and on over many years, is how good that music was, and how dynamic and "real" (for the day) those recordings were.
Jeff
That is mainly due to the fact that in those days, mixing consoles were
extremely basic. In fact, even the ability to equalize the feed from a particular microphone was very rare. Typically the feed from perhaps half a dozen microphones were sent to a mixing board which only had the function of blending the microphones into one of three channels; left, center, and right. The only processing which was routinely done was compressing vocal feeds, a necessity even today since the dynamic range of a close-miked vocal is way too wide for listening.
The typical recorder in those days was an Ampex 300, which was a 1/2" three track machine operating at 15 ips. The three channels were mixed to stereo, usually on either an Ampex 300 two track or 350 two track. Sometimes the master was directly recorded to two track tape. All of these machines and the mixing board were all-vacuum tube of course. Also the studios in those days were actual acoustic spaces with some amount of natural reverb - not like the extremely dead studios which we have today.
Some labels like Command and Everest recorded to 35mm magnetic film instead of tape. This film had 3
very wide tracks so the dynamic range was pretty impressive even by today's standards. In fact, when I was working in film mixing stages, one time we had to transfer a 35mm magnetic film master of a movie soundtrack to digital (three 3-track 35mm machines, one each for dialogue, music and sound effects with left, center, and right tracks each, blended equally together in three track) - the dynamic range was so wide that we had to lightly compress the feed from the 35mm machines otherwise digital couldn't cope with the dynamic range. And remember, analog tape does not hard limit like digital - it saturates gently so the real-world dynamic range is greater than the "measured" dynamic range, and those super wide 35mm tracks had even greater range than usual. Lowering the overall level going into the A to D converters was not really effective either since the quietest parts of the soundtrack which were fine on the 35mm film was too far in the mud for digital.