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
I agree with Greg, the voltage WRT Gnd is important for brightness (as its
what gives the electrons the incentive to move in the first place). Series
connected filaments on individual tube VFDs will give you a nice
demonstration of the same aformentioned problems with linearity of
brightness
FYI, Noritake has some good information regarding VFD driving and filament
bias:
https://www.noritake-elec.com/technology/general-technical-information/vfd-operation
Mark
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I only have 6 of them, but they should be 'enjoyed' I supposenot sure
if they have Hg or not.
On Wed, Sep 11, 2019 at 10:35 PM gregebert wrote:
> It would be interesting to see if these early versions have a decent
> lifetime.
>
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