Gelbanana shared his Numitron driver board in the project log forum. And he is giving away his 5 extra pcb:
I realized that I got extra space while designing the board (5cmx5cm) for my numitron driver board so I decided to add a USB I/V monitor into it. Unlike the others out there that uses polyfuse as a short-circuit protection, mine uses TPS2051C which is a Current-Limited USB Power Distribution Switch.
I have 5 extra pcb to give away. If you’re interested let me know, I’ll send you one.