Papers I have read also emphasize the need to bias the filament above the cutoff voltage of the grid or anode, so I assume if the center tap is attached to ground, that the cutoff voltage of the anode or grid is significantly below that? In fact it would have to be below the negative swing of the AC. It might be easier to connect the center tap to a positive voltage? See the diagram in the "Cutoff bias voltage" section here: https://www.futaba.co.jp/en/display/vfdinfo/vinfo_kudo_1.html
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