[Analog Addict]

Here are some references for common EIA codes, used for tubes, passive components, iron, etc....

http://www.triodeel.com/eiacode.htm

http://www.thevintagesound.com/ffg/eia-codes.html

And a large 18 page list....

http://www.audiophool.com/Misc/1994%20EIA%20Codes.pdf