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.
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