Quote:
Originally Posted by Yamamaya42
vaporized metal from what?  
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Vaporized anode aperture material being re-deposited onto the back surface of the phosphor.
Go to pages 62 and 84 of this pdf.
http://www.americanradiohistory.com/...cs-1955-04.pdf
Tim over on ARF posted that above link in this thread, which was the first time a lot of us seen the light.
https://antiqueradios.com/forums/vie...hilit=ion+burn