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.
Ira.
On 11/23/2025 3:33 AM, Richard Scales wrote:
I have just started testing this display and I am using an A/C supply
for the filament and 24V for the grid and segments.
I am seeing some interesting artefacts on the active segments and am
wondering if anyone else from the group has seen similar?
I have tried different power supplies for the grid and segments, both
hard wired and HV5812 driven segments and with/without series
resistors on the grid and segments.
Has anyone seen anything similar?
- Richard
ILC1VFD.jpg
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