Merry Christmas Everyone !
 
I have 8 old IN-18's that have seen better days. When inserted into one of 
Mr Nixie(UK)'s excellent Cyclox 3 time pieces using it as a testbed, in 
daytime bright mode most of the cathodes light, but some have slight dark 
areas in the middle of the digits. When in night/dim mode this problem 
becomes more pronounced with only small lengths of some of the digts 
lighting up at all. Do you think this is 'cathode poisoning' (wot I have 
heard of) or just gradual deteriation caused by contamination of the gas ?
 
Any ideas how to save them ? Maybe 6 hours in a low oven with the turkey ? 
- or should they be consigned to being connected to higher voltage to cause 
a festive bang and flash ? - If so what power do you suggest to make the 
most spectacular effect ?....... (Please do not try this at home or at 
least when the wife is watching)
 
M

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