Why a negative kilovolt? Negative to what?
Because the tube requires electrons to flow from the photocathode towards the anode, which requires it to be at a 1KV below the anode.
Sure, i can use a positive 1KV supply, but then i'll either have to have two sets of batteries or power it over an isolated brick, since the tube is connected to the rest of the circuitry (preamp, ADC, etc).
Is efficiency a big concern? The easiest solution would be to hack a CCFL inverter.
Not really care about efficiency, unless it's completely dreadful.
I've considered CCFL inverters, but they are unregulated and designed for constant current operation, so i don't see an easy way of making one produce a stable voltage.
Flyback is the most reasonable topology
...
-load changes (the consumption is steady or the load changes all the time)
-input voltage range (are the 12V fixed or it's a battery that changes by a few volts during it's discharge?)
-how precise you need the output to be?
-Do you need to be able to change that voltage while working?
-How much ripple and noise you can afford to have?
Where can i find examples of a flyback design producing a regulated negative voltage?
On the list,
-Load is almost perfectly stable per tube, but not between tubes and between days.
-Input is a battery, so 11-14V or so.
-Very precise. Amplification depends exponentially on the bias voltage, so being a 100V off would make the signal be off by a factor of 10.
-No need to change the voltage past the initial setup.
-The less the better
This product may be is what you are looking for
It's unregulated.
Have a look at this appnote:
So many convoluted self-wound transformers...
I would strongly prefer to avoid this unless there is no other way.