Just a simple vacuum tube. The reference I worked from had the rusted top but I thought the glass top looked better. The rusted top fits right over the glass so you don't have to do any remodeling if you like the rust better. All textures are from cgtextures.com
Rendered in Octane. Let me know your thoughts!
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the screenshot got messed up. Here's a link to the photo as intended. http://i182.photobucket.com/albums/x7/HillbillyOfGod/VacuumTube.png