RCA Experimental Image Converter Streak Tube 9-21-3-1

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This is an RCA image converter tube used by the Atomic Energy Commission for ultra high-speed streak photography. Note that the photocathode shows some discoloration and is thus for display only. The only marking on the tube is "9-21-3-1", though it appears this may be a prototype of the 4449A tube. This image converter was the major element of a LASL E4 streak camera that was built in 1974.