Hi everyone, I have a bunch of NL848 nixie tubes that I savaged from a very old multimeter. I also savaged the transformer and i manage to light one up. I noticed that around the digit there was a blue glowing that I do not see in other images online. Why is that?
Supply is 280V dc, taken form a 200V ac transformer output, rectified and filtered with a 100nF capacitor. Anode resistor is 68k.
See image attached.
Thanks for your infos!