solserenade
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Quote:
Mica is mica.
(not metal, which would be electrically conductive, etc.)
http://en.wikipedia.org/wiki/Mica
You are referring to the plates, there are two smaller rectange pieces on opposite sides of the plates, that run from the top to bottom of the mica(thin metal horizontal circle). These are the sheilds and are commonly a chrome/silver color, if it matches the color of the plates(grey) that indicates its an older tube.
Mica is mica.
http://en.wikipedia.org/wiki/Mica