Hi! I've been using INS-1 nixie lamps for a while and they have always 
ended up flickering after a while. I think i might be doing a couple of 
things wrong. 

A) Polarity. They light up any which way you wire them. from the Datasheet 
(link) <http://tubehobby.com/datasheets/ins1.pdf> i can't definitively tell 
what is the anode and what is the cathode. I know the dot means something, 
but what it does I don't know. (Picture of 
INS-1<http://f.cl.ly/items/2g0Z301L1c3f2y1R0n1e/Image%202012-09-29%20at%204.51.03%20PM.png>)
  
I have tried wiring them either way and they still flicker... This is what 
I think it should be 
http://f.cl.ly/items/2u1p3x3V263X3e3M0s3o/Image%202012-09-29%20at%205.34.01%20PM.png,
 
is this correct?

B) Current. I have a 170 VDC power supply with a 221k Ohm current limiting 
resistor. It has been been running at 0.55mA. 


I'm now trying a higher current limiting resistor that brings the current 
down to 0.45mA. Seems to be working, but I've had ones that worked before 
and then they start flickering. Thanks for any help!



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