Does it change if you use just one or both of the anodes? Does it change if you use a cathode resistor for the "1" digit?
In the few Russian circuits that I have seen they use at least 200V supply voltage, usually 250V, and either direct drive with a transistor in each of the cathode circuit or clamp the voltage of the cathodes with diodes and a voltage divider if the KM155ID1 is used. Sometimes they use a resistor on each emitter of the cathode driver transistors but since I haven't seen the rest of that circuit I can't say if it is there for current limiting or what. I got the same blue dot on a ZM1040 a few years ago. /Martin -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/6c24c693-8fc7-493d-b2a6-339ba8147c1d%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
