It appears to have a few hours on it, although it should be an easy task to 
remove any oxide buildup (cathode poisoning) from the digits.
They're scarce these days, so handle with care :)

Regards, Jeff



On Wednesday, June 6, 2012 11:22:26 AM UTC-7, kay486 wrote:
>
> Hi there, i just bought one Z5680M tube pretty cheap and now im waiting 
> for it to arrive. The thing is that it has dark corners on the anode grid. 
> So im bit worried that it might not function. Does anybody know what could 
> be the problem, and if it affects the tubes function? (see the picture)
>

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