Anode plate from a vacuum tube.
Thanks to Tom Brent, a collector
of military radio equipment.
“The artifact is one half of the plate (anode) structure from a vacuum
tube. The three small rectangular holes accept metal tabs from the almost
identical second half and, when bent flat against the anode half, the two
pieces form a rigid structure that surrounds the filament, cathode and grid
elements of the complete tube. The size of the complete anode (if both halves
were put together) would indicate that this was not a low power receiving
tube and most likely is a type used in a higher power application such as
a transmitter. It is not a part of a tube that would have been used in any
of the radio equipment aboard Amelia Earhart’s aircraft.......the
type 282 final amplifier tubes in the Western Electric 13C transmitter
have a flat anode structure.”
The artifact is almost certainly associated with Unit 92, the Coast Guard
Loran station at the southeast tip of the island. We know that personnel
from the Loran station engaged in target practice at the Seven Site on one
or more occasions. We’ve found numerous M-1 carbine shell casings and broken
Coast Guard mess hall plates at the site. A burned out vacuum tube would
make a good target.