Mike_2545
Super Moderator
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Ted - that big tube image I just posted was a huge mercury-arc rectifier. Google "mercury-arc rectifier" and see if your tube shows up in image search.
Andy - the metallic shine on top is caused by a "getter". A getter is... oh... wait - has this been answered already?
There is much more than the cathode that can fail. Screen grids break, filaments open, Plates open. Being that the tube is somewhat mechanical in connection, many things can fail.
Vintage military German WWII valves.
These are the strangest I have ever seen.......
German vaccum tubes, WWII vintage. photo - Rolf photos at pbase.com
They were inserted into the socket with the brass
pin on top first. I assume that was the connection to the plate (anode).
These were removed from German equipment left in Norway after the occupation.