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In page Nuclear electromagnetic pulse:
"Other components in vacuum tube circuitry can be damaged by EMP. Vacuum tube equipment was damaged in the 1962 testing.[2] The solid-state PRC-77 VHF manpackable two-way radio survived extensive EMP testing.[3] The earlier PRC-25, nearly identical except for a vacuum tube final amplification stage, was tested in EMP simulators, but was not certified to remain fully functional.[citation needed]
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