TJ311M01
SAME AS 3TF7 , MILITARY # 5905002591964 OR 5905006814707 - USED IN COLLINS RECEIVERS , Amperite ballast which regulates 4V to 8.5V at 280mA to 320mA
U1
SAME AS 3TF7 , MILITARY # 5905002591964 OR 5905006814707 - USED IN COLLINS RECEIVERS , Amperite ballast which regulates 4V to 8.5V at 280mA to 320mA