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The 110E/302 transmitting triode was used in the first American air warning radar.
The filament in this exhibit is fractured and has slid out of the anode cavity, and can thus be seen in the picture. It is a bright wire helix and was once supported on the thick rods that connect to the two base pins. The anode is a copper bell cavity that in use would be connected to cooling fins. Within the anode the electrodes would be arranged co-axially, the grid, connected to the side contact, and then to a three wire support system encloses the filament.
The wide glass tube envelope is 70 mm in diameter and, excluding the base pins, is 288 mm tall.
Reference: Private communication.


Updated January 09, 2013.
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