I have finally gotten the tub to light up, which means the PSU is done and I'm ready to move on.

Since the tube is miniature, the voltages needed to run it are smaller than a normal tube would take (much smaller than what I was expecting). The heater is running at 5V, if i were to go any higher the dot would fade away after a few seconds. The accelerating anode is at around 50V, and the EHT is around 1500 - 2000V (I wasn't able to get an accurate reading with my multimeter). For now I have the cathode tied to ground, but I will eventually attach it to a transistor for video and brightness control. Here is the entire unit without the case:

The entire system takes in 12V from a molex connector, and I will also add a barrel jack so the unit can be powered from the wall. Here is a close up of the power supply:

As you can see, the flyback driving transistor needs a fan to keep cool. Without the fan the transistor gets up to 90C, with the fan it sits at around 35 - 40C. There is a thermistor on the heatsink because I'm adding a thermo regulated fan controller, since that thing is noisy stuck at full speed. I also had to add my own primary to the flyback since the built in one is being picky, it might be shorted.

Next up I'm going to work on the cathode control and then the deflection coils. Also sometime soon I'll post schematics of the entire thing, so keep an eye out for that.