Also used on old "lighthouse" tubes used for uhf and low microwave applications
fro the '40's and '50's. If my memory serves me, these tubes were found in
devices like the airborne APX-6 IFF Transponder in which the greatest hazard
was the detonators used to destroy the device should a plane go down over enemy
teritory...
An instrucor in the 70's made sure we were paranoid about both the berylium
oxide and explosives...
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