Your LP's / Tapes will have degraded in quality since their production. If you wish to regain some of this loss I would suggest purchasing Steinberg "Clean". At approx £100 it is not cheap but I have found it invaluable. I recently found a host of my fathers tape recordings from the late seventies, many are live recordings from what was our local folk club. Clean has been a godsend bringing back so much vitality that was missing, it'll never be as good as the original, but it's the best i've found.
All the best