The highest classic way by far is a good SS amplifier ,and Vacuum tube preamp .
please note: buying a good preamp with plenty of power supply power
the biggest mistakes are and ones the biggest inside if you see a round silver volume pot or attenuator -Run , why for its just a $20 volume pot with metal plastic wipers, you want a resistor ladder type, or relay control ,you loose a lot of low level detail with the cheap alps or Bourne type . I know for I owned a Audio store for 10 years . The power supply too is very important, for dynamic swings and soundstaging. Many times in lesser preamps when the performance gets complex and the spl levels a bit high on less expensive units say on average $$3k or less
the soundstage depth collapses and image starts to get thinner and loses focus .vs a good quality unit.
please keep this in mind . Spending a minimum of $5k is a good rule of thumb
And make sure you have at least the 2 items mentioned , balanced input to output also truly makes a Sonic improvement.