That's a homebrew triode built in an apartment workshop by the intrepid Polish radio wizard Aleksander Zawada. The last line in the blog post really got to me: "All is needed now is to solder a socket to the base of the triode, and use it to make (for example) a regenerative radio receiver!"
Check it out: http://lekernel.net/blog/2011/09/prywatna-wytwornia-lamp-where-diy-meets-vacuum-electron-devices/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
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