Tube preamp for pass labs ?


I recently bought a brand new Pass Labs x250.8. It seems to be finally broke in after about 800 hours. I’m using a good preamp, the BAT VK-33se. I’m curious what other tube preamps others are using with this amp? 
one thing I did was bought inexpensive Wireworld stratus power cables on Sale for $116 shipped brand new for amp, preamp, dac, and server. They seem to have helped settle my system down quite a bit. I really like these inexpensive cords. 
but, again what tube preamps are you owners of the 250.8 using?

TIA for any info given. 
Starboard

starboard

Check out Aric Audio online. If interested follow up with a call. Great 6SN7 line stages. Tube rectified, point to point wired. Aric is great to deal with. 

I use one of his preamps with my Pass XA-25. 

There's a Rogue Audio 99 that was used with a Pass Labs XA 25 on Ebay for $1400 right now. You might ask the seller what he experienced with it.