[GreenKeys] Radio valve/tube CG 502A

[E. Groenenberg]

Hello All.

A long shot, but there is a chance someone will know.

I have found 10 pieces of radio valves/tubes, metal can with
the print 'JAN CG 502A' on them, and the white cardboard boxes
have a bunch of numbers etc. Must be Joint Army/Navy, but I have
no idea what the more common equivalent type number would be.
The are made by G.E.

Anybody have an idea which type of tube it is?

Thanks,

Ed
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