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12AP4 Manufacturing

This tube, made in 1939, was used in all of the American 12 inch mirror in lid sets before the war. Since the majority of sets owned by collectors use this tube, much work is going into rebuilding the tube and finding a substitute. 

 

The Manufacturing Process

 

Removing fluorescent material from a furnace

 

Joining shank and tube

Tube being subjected to factory tests

Tube undergoing life test

Tube being tested with a special test pattern

 

 

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