Chip in Glass Driver VFD : BD-VFD https://www.noritake-elec.com/technology/general-technical-information/cig-driver-vfd
A Guide to Fundamental VFD Operation https://www.noritake-elec.com/technology/general-technical-information/vfd-operation
https://github.com/qrti/VFD-HCS-12SS59T
https://github.com/m42uko/hcs12ss59t
https://notsyncing.net/?p=blog&b=2018.vfdboard
https://www.youtube.com/watch?v=cBs6WYeTMck https://www.youtube.com/watch?v=nlyxGYsubxQ https://www.youtube.com/watch?v=218j79uQ4Gk
VFD Filament Driver Using 555 http://www.kerrywong.com/2013/06/05/vfd-filament-driver-using-555/