Jmcgrogan2 - you hit something there. Tube amps typically have very high input impedance, much higher than the typical SS amp, and this is why passives work better with them.
However, in almost all cases at least, a very good active pre will eclipse any passive. The passives all somehow lose body and drive.
However, in almost all cases at least, a very good active pre will eclipse any passive. The passives all somehow lose body and drive.