>5V, speak to them

Before you do that, make sure that the display does not completely go lit
and off when anode and grid are driven with only 5V ;) Some displays can
do that. Basically supply -20V to cathode and 4.5V floating to filament
thereon. Then, switch grids and anodes between GND and +5V. It might work
afaik. Some very sneaky tricks can be implemented in simple triode
type devices by just manipulating the distances and geometries of the
electrodes.

Peter

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