> Ucc = Ukk = Voc = Uclamp = cold cathode voltage = off cathode voltage (kk = 
> kalte kathode (German)).

I had remembered that U was used for voltage in Europe (and B in Russia), but I 
was a little confused by "cold cathode", as all nixie cathodes are cold.  I had 
surmised that it was "off cathode", but I appreciate the clarification.

> The voltage measured from GND to the switched off cathodes.
> At dircet drive, the Ukk is equal to Ua (Ua = Va = Up = Vp = Anode voltage = 
> Supply voltage = Plate voltage)

Not necessarily - if you're direct driving them with 74141 chips, Ucc would be 
about 60 volts, and with K155ID1 chips, about 100 volts.  Aside from those, 
yes, the off cathodes would be allowed by most drivers to "float", and they'd 
tend to float to the anode voltage (which isn't always the supply voltage, but 
the maintaining voltage if another cathode is lit and there is an anode 
resistor).  I realize that's pretty pedantic of me, but it's easy to get 
confused about what your circuit is actually doing unless you're aware of these 
various effects.

- John

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