Working Result So Far:

This is a test fixture before finishing a PCB that mounts to the D-SUB connector, and has a LCD readout for scaled voltage. I'm also planning on putting a precision DAC on it to allow software control in the future if desired.

Short of the PSU running a Fusor:

Pin-outs and Electrical:

I found some similar models online (TOF3000) with pin-outs listed, since there appears to not be a datasheet available for the X3000 model (most likely due to it being used in OEM products? Regardless, this appears to all be correct. The board images also show additional connections with de-populated components, so maybe this PCB is used for multiple products.

I took the supply apart (as much as you can, all the high voltage components are encapsulated in the rear of the supply.) Here are some high res images, it is interesting there is not a single PMIC on here, all discrete analog and op-amps. I have not measured the ripple, but I question if this is a Royer Oscillator design with a voltage multiplier output.

Back of the control board:

Front of the control board:

Control board mounts to this:

The power section has a UF Diode (Left), two CEN1111 BJTs (Center), and a LM7815 Regulator (Right). This again makes me think this is a self resonating supply.

Basic Controller:

Before I make a custom PCB, I figured I should ensure the thing turns on... I soldered up a fairly formal looking SUB-D connector, and then soldered it onto a hastily thrown together perf-board.

Below, there is a polarity control, enable switch, and two cheap "voltage monitor" displays (for 0-10v current and voltage output.)

The other pain, the high voltage output is basically unavailable anywhere. After taking some measurements, it appears to accept a 3mm pin, and I found if you file down a typical BNC connector (including the 'cheap' e-bay Chinese ones for high voltage, it is a 3mm pin...) I also had to file down the plastic outer sleeve ~1mm to make a friction fit.