Yes, that is the explanation I also came to. But is it possible? I
believe battered Nixie show black deposit rather than bleaching around
the cathodes.
Isn't it possible that the back plates were just made that way? Have
anybody ever seen a B7971 with completely black back plate?
Marcin
On 27/05/2013 17:22, [email protected] wrote:
I always assumed that the lightening was
caused by sputtering: some of the positive ions miss the cathode and
hit the back plates, eroding the black material. If the discoloration
came from the manufacturing process, like shadowing by the cathodes
during deposition, I would expect it to be more loaclied under the
wires.
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