Yes, I can indeed alter the frequency and I am about to test that - I shall report back asap. - Richard
On Monday, 24 November 2025 at 15:25:23 UTC Instrument Resources of America wrote: > I do understand the DC gradient, but if the pattern changed that would > tell you something. Also when you say that you are driving the filament > with A/C from "a custom designed board" does that mean that you might be > able to change the 'driving frequency'. If so, then you might try to change > the driving frequency and see what the result is. > > Ira. > > > > On 11/24/2025 12:59 AM, Terry Kennedy wrote: > > 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 > > <https://groups.google.com/d/msgid/neonixie-l/ecddbc8b-f71d-4751-8321-9d4998d70d22n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > -- 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/b245d001-3f7c-423a-9732-22ae0a4e06d5n%40googlegroups.com.
