Burroughs 6844A is domed not flat. I also have some National
Electronics NL-6844A tubes. Frankly, I have had much better
luck with the National Electronics brand. This recently purchased
batch of (8) Burroughs 6844A tubes is a bad batch.
The boxes all are stamped MAR 4 1968. The tubes themselves are
date-coded 6750 F20. In white letters stenciled on the glass:
"Burroughs 6844A NIXIE".
The test I did was that the anode got connected to +170 volts DC
through a 15k resistor. Then the digit cathodes were selectively
grounded to the negative side of that power supply. On all (8) of
these Burroughs tubes, most of what is seen is an intense glow concentrated
around the tiny internal wires which connect the digit cathodes of the
stack, to the pins. These tiny wires pass closely to the outside of the
Anode casing which surrounds the digit stack. The glow strikes in the
wrong place. The glow is around the lead wires instead of being
around the digits. I am very confident from the way these tubes were
in those boxes, that only one of the batch had even ever been out of the box.
So I am curious what causes the glowing lead wires.
Chuck
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