Grayson's Thermatron Timeline

Our friend Grayson put a lot of effort into this very interesting timeline of tubes (aka valves, or thermatrons).  Thanks Grayson!

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Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htmOur coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmokeOur Book Store: http://astore.amazon.com/contracross-20