hi guys, 

I recently bought a bunch of different nixie tubes and as my very first 
project I designed a simple
thermometer with an in-9. at first the problem was that the bar was only 
about 3 cm long, 
even at more than the highest rated current. I read somewhere that those 
tubes sometimes need 
some sort of "burn in" phase, so i ran them at about 18 mA for half an 
hour. after that, the bar was
about 8 cm long. However, after not running for two days, the bar length 
dropped again by about
1 cm. 

i use a switching power supply at about 130 V.

is there some way to get around this problem? or do I have to run them 
continuously...?

thanks!

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