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Although we could find little information on the BT111 thyratron it appears to have been used in timebase circuits for RADAR, TV and oscilloscopes.
The main electrodes are connected from the pinch to the pins by copper braid. The device is cold cathode and appears to be of a tetrode design with two control electrodes. The anode is connected to the top cap.
The wide glass tube envelope is 30 mm in diameter and, excluding the UX4 base pins, is 144 mm tall.
References: Observation and Internet.


Updated January 03, 2013.
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