Really one volt? How much current?1 volt output
Well having repaired countless items using such displays, the centre-tapped transformer is pretty well what's ALWAYS used.
Why worry about the speed?, it's only a heater - there were usually two different options used in commercial designs (back when VFD's were used), one was similar to post #3, and was essentially a DC-AC converter 'bodged on' when it had to be powered from a single DC rail. The other, was less of an after thought, and simply used an extra tapped winding on the 50/60Hz mains transformer - so only fed the heater with 50/60Hz.I was trying to make a 1 volt output something like this
With a lm358 not much luck I would use the above but not much luck with finding the chip used where i can get one fast enough.