Here is a detailed description of the tube.
The Filament voltage is 3.15V (150 mA). You have pins 1,2 (+) and 14,15 (-) to use. It’s not necessary to use both couple, 1 or 2 and 14 or 15 are enough.
(It’s also possible to use AC for the filament.)
The next is our Grid voltage, +20V (45mA .. 50mA). The Grid are the pins 4, 8 and 13 (one of these).
The other pins are the segments. To use with +20V too. Each segment needs 3mA .. 4mA current.
It’s possible to reduce the Grid and segment voltage down to 12V. The segments are still on, but not so bright. For test it’s great!