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Evil Mad Scientist Laboratories has a fantastic Nixie tube take-apart article and photo set --

Don't you just love nixie tubes? They glow with a lovely neon color and have gorgeous stylized numbers-- something you can't get with a dot matrix-- or even sixteen-segment LED or LCD display.

Recently, we disassembled a well-loved tube when there was a photogamer challenge to break something, and so we had a chance to peek inside and look at how they are made.

Warning: This article contains graphic images of the dissection of vintage electronics which may be disturbing to some viewers. (No working nixies were destroyed in the making of this article.)

Evil Mad Scientist Laboratories - Nixie tube take-apart - Link.