The Krell Army may not like it but please consider this. Vandy owners often choose tube electronics to bring out the best tonality of their speakers. In my experience, Krell electronics are at the opposite end of the sonic spectrum from tube gear. Therefore, even if you want to stay with SS electronics, I believe many other options could provide a better match.
A second point, Krell amps are best known for their bass control. Since the Vandy 5as have their own woofer amps, the Krell would be bypassed in the bass range. Therefore, you would not be hearing the Krell for what they do best.
But as with every question on audio, it will depend on what you like best. At this price point, your personal audition should be mandatory.