I am partial to tube amplifiers and particularly SET amplifiers (With suitable speakers).
However I have to agree with clearthinker and say that a SET even utilizing a high power output tube such as the 833 wouldn't be the best direction to take with this type of speaker.
Very high power push pull tube amps may be a viable alternate but keep in mind these amps have 'multiple' numbers of tubes to deal with. All things considered I believe using a tube preamp is a very reasonable approach with the current speakers and SS amplifier (Both of which the OP likes). A tube preamp using the 6SN7 is a good recommendation in my opinion.
Charles