You should probably try and find out what kind of amp compliments that vox in a stereo mix. It won't be quite the same amp, but it won't be the polar opposite. The vox has a really chimey, sparkly clean to it, and it doesn't get much gain, but the gain it can get is very thick and mid heavy. Try to find an amp that works well with that vox.
Might I suggest an old Ampeg? One of the Blue Checked ones, like a Reverberocket or Gemeni? Great amp, with a bit of clean bluesy breakup, but rather than being bright and chimey, and it's full and robust. It'd give you some contrast, yet still remain in the ballpark of clean with a bit of breakup.
Try to different tube amps that are voiced differently. A Marshall haze would balance two sounds. A Fender Pro Junior would blend too.
I use a Twin Reverb for outside gigs. Indoors is my Deluxe Reverb.