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

It would be in your interests to investigate the Pass Designed Korg B1 Pre Amp.

I am familiar with this design used with both SS and Tube. It is a Pre' that has well documented upgrade options.

As the basic build it offers a substantial amount and has proven to be a showstopper when built with a compliment of upgrades.  

I have Pass 250.5 with Conrad-Johnson Premier 10 and 18. Excellent match. Driving the original Revel Salon Ultima.