As has been previously mentioned, when combining the two, one has to be mindful of the impedance output and input impedances. How ever, the volume issue mentioned is more likely to be a result of a high output voltage (typical with tubes) into a high sensitivity amp (not uncommon with ss amps).
Matching solid state amps with tube based pre amps
I was like to get people responses on the mixing a solid state power amps with a tubes base preamp or match only with
solid state preamp.
solid state preamp.