Hello Shane,

hmm, maybe the driver does not work well enough? If the digits that are supposed to be "off" have a potential that is near ground, they might light up. Check the voltage on the faulty digits accross ground.

My first guess was - without seeing the pictures - that you had tried to drive a biquinary Nixie tube as a normal one. Biquinary Nixie tubes have 0 and 1, 2 and 3, 4 and 5, you know, all even and odd numbers connected in parallel with two anodes. This way they have a standard noval socket, but require a different kind if handling. But it looks o me as though your tube was an IN-14, right?

Jens

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