Who has done 2.3 inches of common positive digital tube drive, I used his drive voltage of 9V is enough, but I use the MCU output signal?

Use a single chip computer to drive the transistor, and then use the transistor to drive the led.

The voltage of the MCU is 5v, and the voltage of the triode is 9v.

If it is a common positive nixie, the segment code should be driven by a low level