On Sunday, November 23, 2025 at 8:17:36 AM UTC-5 Instrument Resources of America wrote:
Just a guess on my part. Have you tried driving the filament with a nice clean D.C. voltage rather than A.C. In the early days of radio NON uni-potential cathodes (a bare heater with no separate cathode sleeve) in radio tubes caused issues, which is why cathode sleeves were soon adopted to house the heater and create a uni-potential cathode. These displays are so large that there's quite a large end-to-end voltage gradient between the two ends of the filament and the segments. You'll end up with a display that's brighter on one end than the other. I know because I did my initial testing with batteries driving both the filament and the segments. -- 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 view this discussion, visit https://groups.google.com/d/msgid/neonixie-l/ecddbc8b-f71d-4751-8321-9d4998d70d22n%40googlegroups.com.
