One example that is supported by (or supports?) Al's always succinct, useful, and thorough advise:
I use 5m runs of extremely low capacitance RCA IC's (Nordost) between high input sensitivity (.75V) tube mono blocs and a high quality resistor based pot passive preamp; fed by a very high gain phono stage (EAR). Very short lengths (1.5') of Siltech speaker cables connect the amps to fairly high efficiency, 6 ohm load (nominal) speakers. Works great!
I use 5m runs of extremely low capacitance RCA IC's (Nordost) between high input sensitivity (.75V) tube mono blocs and a high quality resistor based pot passive preamp; fed by a very high gain phono stage (EAR). Very short lengths (1.5') of Siltech speaker cables connect the amps to fairly high efficiency, 6 ohm load (nominal) speakers. Works great!