I have many old vacuum radio tubes laying around and I love the look of them glowing (as they would in an old radio) but not having an old radio I put one on top of a pen drive which has an unusually nice pulsing glow and there it was! Exactly what I wanted. The housing is made from an old electrical test box (gutted) and various bits of junk I had lying around (see description at end of video). Breaking open the pen drives is tedious but necessary to achieve maximum light output. I may build another one!
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