Hi! 8k2 value is proven and totally safe when used with 170-180V DC. Recently I updated the specification for our tubes and decreased the minimum current from 5mA to 4.5mA. The currents are different for every digit anyway - we need to specify this as well for the customers who build the clocks with a current source. There is not a big difference in lifespan/risk of cathode poisoning, it is more about balancing the brightness of the digits.
Regards, On Sunday, 25 July 2021 at 18:48:37 UTC+2 gregebert wrote: > Just to be safe, I suggest you measure the voltage drop across the anode > resistor, and use Ohm's law to compute the current. For an 8.2K anode > resistor, and a current of 6mA, the voltage-drop should be around 50V. If > the voltage is below 40 volts, your anode current is too low because it's > less than the datasheet minimum-current spec of 5mA and you run the risk of > cathode poisoning. > > I use an actual current-regulator in my designs, rather than just a > resistor, so that variations in tube characteristics and supply voltage > dont affect the current. > > On Saturday, July 24, 2021 at 3:30:00 PM UTC-7 MichaelB wrote: > >> Still have to build the taller colon towers, but I was pleased to see >> that these work as possible replacements for the real thing. I used 8.2K >> Anode resistors vs. the 10K's Thomas used to recommend for the Z568's. And >> since they're taller they require a taller top, as an aside. >> >> [image: 8E6AD098-89D0-4C9C-A2CE-2204AFC1AACB_1_105_c.jpeg] >> >> >> >> >> >> -- 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 neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/94c1af72-50e0-4666-b3f7-40f5650508c4n%40googlegroups.com.
