each stage has an effect, and if you were going to be pedantically purist about it, then........
you'd need to record to tape,(of appropriate formula, on the right kind of machine) using appropriate mics, through period pre-amps, and eq and dynamics (where necessary) ,
then mix it on an old desk... again with appropriate outboard...
recording the mix to 2 track analogue tape... THEN run it in to the computer.
do what you're doing now.