The X504 is triode tube with a small, stepped, cylindrical base and finned anode made by EIMAC. Internally it is supposed to be a 450T and one of the first metal-ceramic tubes ever made circa 1951. The evacuation tube hasn't been sealed and cut yet. After sealing, the tube would have been 6.00" long.

Length = 7.75" Diameter = 2.75"
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