William Blair wrote:
Right now, my goal is to build just an astable
multivibrator clocking a 4-bit counter. To show the alternating state of the
multivibrator, I'll light the tube from below through the hole in the center of the
socket with a two-color LED and the states of the counter tubes will be indicated by
lighting them from below with a red or blue LED. I've got the special effects
visualized, but that's the really easy part.
Would not a green & red Ne-2 would fit the mood better.
If you have the HV why not go nixe tube?