What he said!!
I can't understand where all the distortion has gone with these 70s remixes! This one in particular has always had some pretty irritating grunge in various places on all the stereo mixes I've heard, in any format. And now here it is, clean as a whistle, like it was just recorded last week! Okay, that may be pushing it, but it's drastically improved - like an old scab that has finally dried off and fallen away, leaving a tiny bit of scar tissue.
I've always assumed the distortion I was hearing was "baked into" the original tracks, just a limitation of the early tech of the times, perhaps those early solid-state consoles. And I suppose that could still be the case, since the console actually performed 2 separate tasks, recording and mixdown, at different times. Obviously the old mic pres & channel strips did a decent job, but maybe the mix bus was where the trouble happened? Or it could have been the post-mix processing - compressors & the like. That would explain things, but of course I can only speculate. Whatever it was, I'm surprised and amazed to be hearing all these old favorites like this - I surely never thought it would happen.
-- Jim