I've had problems with swarf and small cut off pieces of electrodes inside some Nixies and also Dekatrons, this has mostly happened tubes manufactured by Mullard. I also read on another forum that this happened to a lot of the Anita Calculators which used Mullard manufactured ZM1080's, here: http://www.vintage-radio.net/forum/showthread.php?t=73142. In some Dekatrons the loose pins could be shaken around, but in some cases I had to hit them hard, after they had formed a short to get them loose again. Sometimes there were burn marks left which meant that there was an occasional flash over and in some cases there was a permanent path for the current to pass through. I've had this problem with Z504S and Z505S plus the ZM1050/Z550M.
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