Thanks for the info. I'm definitely using per-tube current-regulators on the cathodes; already did this on some of my other designs and I'm very happy with it. My HV supply is +200V (linear, not switching), so I'm hoping it will give enough margin as the tubes age. I have a jumper option to boost another +30VDC if necessary via aging. The tradeoff is wasted energy (heat) at higher anode voltages. I'll have a better idea about striking & sustaining voltages when my first batch of tubes arrives next week.
Regarding PWM, since this is an FPGA design I can probably do this well above 10kHz if needed, to avoid mechanical resonance in the tubes. It then becomes a tradeoff with switching losses on the drivers, which I think are much lower than reduced power consumption of the tubes, so the net product is less energy. -- 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/cb21ddde-a496-4ce6-8d72-bd567e4d1bab%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
