tube pre-amp for active monitors


I have Airpulse Model 1(A200) active monitors currently fed by MacBook Pro > Tidal > Wyred4Sound Re-Clocker > SMSL SU8 > balanced XLR out. I wonder if a tube preamp might yield some gains.... anything not-expensive that might fit the bill? Looking for a bit more enveloping soundstage....
canibefrank
Could be. And there are balanced tube preamps available too.

What is your budget and do you need a phono section?
@atmasphere 
i do not need a phono section. I only use the MacBook pro. Budget would be.. budget as in less than 200 dollars.
If you want a tube preamp for that kind of money you are probably looking at something used and vintage.