My vote is to play it safe and find or make a supply that gives you 2.5kV.
I was going to recommend a series dropping resistor, along with the 3kV
supply, but I dont think that is a good idea. The reason is that while the
resistor will provide a voltage drop at *nominal* current, it wont do
anything at low or zero current. Given NIMO tubes are expensive and rare, I
wouldn't risk applying higher-than-spec voltages, just in case it might do
something unexpected. For example, I've seen tin whiskers develop in laptop
CCFL driver boards. Literally a microscopic metal hair that grows in a high
electric field. Even at lower voltages, I've seen evidence suggesting this
happened in my IN-1 nixies.
High voltage zener diodes (~160V) might work but be very careful about
leakage current; you may end up with the same paranoia I have about using
resistors mentioned above. If you do use zeners, I would use a 'bleeder'
resistor from NIMO-anode to GND to drain zener leakage current, such as a
few 22Meg in-series.
You received this message because you are subscribed to the Google Groups
To unsubscribe from this group and stop receiving emails from it, send an email
To post to this group, send an email to email@example.com.
To view this discussion on the web, visit
For more options, visit https://groups.google.com/d/optout.