> I've seen this before, but only on a multiplexed design. I doubt very > much it is your K155ID1 chips, I had a duff Nixie tube that had failed > internally which then caused all the others to look this way - it was a > tiny miniature Rodan tube and a pig to find because I didn't expect a tube > to fail this way and they were all soldered onto the PCB. Just check with a > meter on Ohms that there is no suspicious low resistance between your > cathodes on your multiplex bus.
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