The standard explanation for how too low a powered amp can damage a speaker goes like this -- a low watt amp coupled with an inefficient speaker will make the listener turn up the volume which will then push the amplifier into steady clipping. The clipped amplifier output waveform now contains large amounts of very high frequency distortion that is being feed into the speaker. It is this steady stream of high frequency content that is normally never found in music that can burn out a tweeter.
Your tube amp won't clip in the same manner as a solid state amp, but it will still clip. Whether it actually damages the speaker depends upon how long the clipping occurs, the robustness of the tweeter design and the overall design of the crossover network. My guess is that it shouldn't be a major concern.
You do realize that you're the only person in recorded history to have every paired these two components?
Your tube amp won't clip in the same manner as a solid state amp, but it will still clip. Whether it actually damages the speaker depends upon how long the clipping occurs, the robustness of the tweeter design and the overall design of the crossover network. My guess is that it shouldn't be a major concern.
You do realize that you're the only person in recorded history to have every paired these two components?