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I picked up this little 6" HeNe tube off flebay last weekend and am having problems getting it fired up. I tried both my red HeNe PSUs but I haven't even got a flicker from it. If I did things correctly the cathode is can end of the tube and the anode being the clear end. The only ting I can think of is the mounts that came with my HeNe kit isn't making proper contact. Do I need to make contact with the round metal part right next to the tube instead?
Here's a pic of the tube.
2012-04-04_09-07-38pm by ltkernelpanic, on Flickr
Here's a pic of the tube.
2012-04-04_09-07-38pm by ltkernelpanic, on Flickr