Thanks, i will keep fingers crossed.
I never realised keeping a tube unused would be bad for it... but i can see 
first hand this has happened

On Monday, May 14, 2018 at 9:09:27 PM UTC+1, Jeff Walton wrote:
>
> A tube that has sat dormant for a long period can exhibit these issues.  
> The cathodes can pick up surface contamination which will likely clear up 
> if you run them for a day or two.  It's not exactly the same as operating 
> cathode poisoning but shows similarly.  This is very typical when you get 
> an old nixie.  Regular operating keeps the cathode "cleaned". 
>
> Jeff
>
> -------- Original message --------
> From: christopher helps <[email protected] <javascript:>> 
> Date: 5/14/18 2:37 PM (GMT-06:00) 
> To: neonixie-l <[email protected] <javascript:>> 
> Subject: [neonixie-l] z568m tubes starting to fail 
>
> Hello,
> I have had a six digit nixie clock running on and off for a number of 
> years but today switching it on after being boxed up for a year it is 
> showing signs that some tubes are fading!!?
> Is this something that can be repaired-by anti poisoning?..is this the 
> first sign that they are on their way out.
> It seems odd that it was fine before boxing them up then suddenly three of 
> them have some digits with dark areas...any advice would be very grateful
>
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